Answer:
Down syndrome occurs when the nondisjunction occurs with Chromosome 21. Meiosis is a special type of cell division used to produce our sperm and egg cells.
Which describes the main purpose of RNA polymerase during transcription?
A. RNA polymerase is guided to the coding region.
B. RNA polymerase produces mRNA from DNA.
C. RNA polymerase pulls apart the double helix.
D. RNA polymerase reaches the end of the gene.
Explanation:
RNA polymerase reaches the end of a gene. Which describes the main purpose of RNA polymerase during transcription? ... RNA polymerase reaches the end of the gene. RNA polymerase produces mRNA from DNA
Answer:
it's D
Explanation:
Two examples of how plants move include changing location as part of reproductive strategies and their growth in response to different environmental factors. Explain the impact one of these examples may have on secondary succession in an area after a significant disaster.
Answer:
Secondary succession occurs when the severity of disturbance is insufficient to remove all the existing vegetation and soil from a site. Many different kinds of disturbances, such as fire, flooding, windstorms, and human activities (e.g., logging of forests) can initiate secondary succession. Pioneers of secondary successions face quite different conditions from those that accompany primary succession. Secondary successions often start with resource-rich conditions associated with high light availability and reduced competition for nutrients and moisture. Disturbances may also be short-lived; for example, gaps created in forest canopies close as the crowns of surrounding trees expand and as seedlings and saplings in the understory grow up in response to increased light. Pioneers rely on recruitment from propagules present in the soil, or that disperse into the site after disturbance occurs. Pioneers are able to outcompete established vegetation that survived the disturbance by maintaining high juvenile growth rates. Some of the fastest growing trees are pioneers in tropical rain forests. Individuals of the balsa tree Ochroma pyramidale, for example, can grow from seedlings to adults with >30 cm trunk diameter in <10 years.
The difference between pioneer and nonpioneer species is difficult to delineate (Table 1). Attempts to define distinct life-history strategies (implying coordinated evolution of life-history traits) are confounded because key traits such as propagule size and juvenile growth rate can vary over several orders of magnitude within a community and show broad overlap among species with contrasting habitat requirements. Nonetheless, interactions among traits can be used to describe some life-history tradeoffs that largely constrain the habitat requirements of pioneers. For vascular plants, paramount among these is a tradeoff between growth in the sun and survival in the shade (Figure 3). The high growth rates of pioneers are maintained by allocating a large fraction of the plant’s resources to new leaf area production, and by investing in nutrient-rich leaf tissue that can attain high-maximum photosynthetic rates. A consequence of preferential allocation to leaf production is that few resources remain that can be used to defend the plant against herbivores and pathogens, or to recover from physical damage. This results in high mortality, particularly in the shade, where resources needed for tissue replacement are most limiting.
Table 1. Characteristics of pioneer tree species in tropical forests that distinguish them from nonpioneer species
Pioneer speciesNonpioneer species1. Juveniles recruit from seed following disturbance; seedlings are unable to survive beneath a forest canopySeedlings and saplings persist in the shade of a forest canopy2. Seeds germinate in response to cues provided by changes in light, temperature, or soil nitrate concentrations indicating disturbance to canopy vegetationSeeds germinate immediately after dispersal or seasonally during periods favorable for establishment3. Seeds generally small; frequently dispersed by windSeeds may be large; frequently dispersed by vertebrates4. Seeds often persist in the soil (weeks to decades after dispersal)Seeds lack dormancy or remain in the soil for less than a year5. High height growth rate and juvenile mortality rateLower height growth, crowns often show lateral spread in the shade6. High maximal photosynthetic rate, light compensation point, and foliar nutrient concentrationsLow maximal photosynthetic rate, light compensation point, and foliar nutrient concentrations7. Short-lived leaves with high leaf area per unit leaf massLeaves of juvenile plants may persist for several years with low leaf area per unit leaf mass8. Open canopies with sparse branchingClosed canopies9. Low wood densityMedium–high wood density10. Low investment in chemical anti-herbivore defenseHigh investment in chemical and structural defenses11. Often form defensive mutualisms with antsDefensive mutualisms uncommon12. Adult lifespan typically <100 yearsAdult lifespan up to 500 years13. Wide geographic and ecological rangeOften restricted geographic range
hope it was helpful for you
stay at home stay safe
keep rocking
Although the most frequent forms of Down syndrome are caused by a random error, nondisjunction of chromosome 21, Down syndrome occasionally runs in families. Which of the following is the cause of this form of familial Down syndrome?
A) an inversion involving chromosome 21
B) a chromosomal aberration involving chromosome 1
C) too many X chromosomes
D) a translocation between chromosome 21 and a member of the D chromosome group
E) a maternal age effect
Gregor mendel concluyo que cada guisante tiene dos unidades para cada rasgo y cada gameto cotiene una unidad . Las unidades de mendel se conocen ahora como
Answer:
Las unidades de Mendel se conocen ahora como GENES
Explanation:
Durante sus experimentos, Mendel demostró que las características de las plantas de guisante (por ejemplo color de la flor, color de la semilla, forma de la semilla, altura de la planta, etcétera) eran heredadas, y denominó "elementos" a las unidades portadoras de dichas características. Es decir que cada elemento o unidad discreta, era el responsable de que la planta exprese una u otra característica. Estableció que estos elementos se redistribuían independientemente uno de otro, generación tras generación. Con el paso del tiempo y el avance de las investigaciones, estas unidades o elementos fueron denominados Genes.
_______identify the organ or structure Opening (valve) between stomach and small intestine.
Answer:
The pyloric sphincter valve
Explanation:
The pyloric sphincter is a thin, circular band of visceral muscle surrounding the pyloric opening at the inferior end of the stomach. It is found at the border of the stomach's final segment , the pylorus, and the small intestine's first segment, duodenum.
Two dangers associated with the exposure of X-ray
Answer: Children are Especially Vulnerable to X-Ray Damage and Dental X-Rays Every Six Months, and Probably Every Year, May Cause More Harm Than Good
A marine biologist discovers a new marine animal that has a coelom, but it does not develop from the mesodermal tissues. Under which category should she classify this animal? A. pseudocoelomate B. acoelomate C. coelomate
Answer:
A. pseudocoelomate
Explanation:
The body cavity of these animals is filled with fluids. Internal organs are covered by the fluid-filled space. The body cavity serves as the hydrostatic skeleton and has other functions such as digestion of food and waste removal.
Maureen is writing a report on how the brain may use dreams to consolidate and organize the information, stimuli, and memories observed and collected over the course of the day. Which theory of dreams is Maureen researching? a) psychoanalytic theory of dreams b)information processing theory c)physiological function theory d)neural activity models
B) Information Processing Theory
The information processing theory states that dreaming is a process to deal with information and observations collected from daily life and memories. It creates images, impressions, and narratives inside a person’s head.
Please help me
Which statement correctly explains what a scientific theory is? A. statements that describe observed realities. B. a concept backed by many well-supported hypotheses. C. a guess that might explain an observation. D. a concept that is absolutely true
Answer:
B. a concept backed by many well-supported hypotheses
Modern domesticated pigs are descendants of the wild boar(Susscrofa). Through the domestication process, human have artificially selected for certain traits. Identify two of these traits, and briefly explain how they benefit modern society. Be sure to identify the trait, explain why it was artificially selected and how it benefits modern society.
Answer:
Meat for food and small size for pets
Explanation:
Artificial selection is the process by which humans control desirable phenotypic characteristics in plants and animals by applying selective breeding techniques to perpetuate these traits in the population. A example of artificial selection includes the process of domestication of modern pigs (Sus domesticus). It has been shown that the modern pigs derived from the wild boar (Sus scrofa), which were domesticated separately 9,000 years ago in China and Western Asia. For example, by artificial selection, humans have domesticated moderns pigs to use them as livestock for direct consumption (i.e., for their meat). Moreover, there are pig populations that have been artificially selected as pets (e.g., miniature Vietnamese Pot-Bellied pigs).
Describe how Stella’s view of these plant cells and their parts changed as she transitioned through the three levels of magnification. Be sure to identify at least one cell structure or part of the leaf cells in your description.
Answer:
The three different views show different level of magnification.
Explanation:
At the first level the structure of plant cell is not clear however upon more magification the view is clarified and the upper epidermis and the lower epidermis are both visible in the third view which is the most magnified. The parts of leaf cell are visible the most evident of them is the epidermis which protects the outside of the cell and also Palisade Mesophyll is visible which helps in photosynthesis.
Answer:
At the first level, the structure of the plant cell is not as clear, but when the image is at 100x, the plant cell is magnified and a lot of detail can be seen. At 400x, which is the most magnified, the details are more and the image is larger, allowing Stella to take note of it. Palisade Mesophyll is part of the cells of the leaves and helps in photosynthesis.
Areas on the moon called maria Select one: a. are seas of water. b. consist of basaltic lava. c. formed a million years ago. Clear my choice
Areas on the moon called maria consists of basaltic lava. Option B is correct.
The areas on the moon called maria are not actually seas of water, as option a suggests. Instead, they are large, dark, flat areas on the moon's surface. These areas were formed by ancient volcanic activity.
Maria are made up of basaltic lava, which is a type of lava that is low in viscosity and can flow easily. When volcanic eruptions occurred on the moon in the past, this lava flowed out onto the surface and covered large areas, creating the maria.
These volcanic eruptions and the formation of the maria took place billions of years ago, not just a million years ago as option c suggests. They are remnants of the moon's early history when volcanic activity was more prevalent.
To know more about basaltic lava:
https://brainly.com/question/33728480
#SPJ4
Answer these:
1) What is bone marrow?
2) Where is it located?
3) Can one live without a bone marrow?
4) What is bone marrow made of?
Kratika Please hurry and answer, you have always helped me.
Answer:
These are the answers:
1) Bone marrow is a spongy tissue inside some of our bones.
2) It is located at the ribs, bones of the pelvis and vertebrae,e.t.c.
3) Yes!, A person can live without a bone marrow only if they receive regular blood transfusions.
4) Bone marrow is made up of large bones.
Explanation:
A bone marrow is where new blood cells are produced.
Hope it helps.
The Grey Cat.
Each day you take a walk at a different time following the same route. Along your path there is a bus stop with a bench located at the bottom of a hill. Upon this bench sits a grey cat. Each day, as you pass this grey cat, you say “hello cat”. You’ve recognized that each day, as you do this, a bus consistently comes over the hill. The consistency of this events sparks your interest, it seems to go beyond the possibility of coincidence. In order to satiate your curiousity you have decided to design an experiment to investigate the anomoly.
Working with just the information provided, create a GOOD Hypothesis about the above scenario. Generate an experiment to test your hypothesis, and write an experimental design. Your experimental design writeup must clearly define all essential aspects of the experiment.
Note: Avoid suppositions at all cost! Work with only the information provided. This is science.
Hypothesis: There is a synchrony between the time the bus passes over the hill, the time the cat is positioned on the bench and the time I talk to the cat.
An experiment will be established to prove or deny this hypothesis. This experiment will try to answer if there is a synchrony between the bus, the cat and me.
First, I will write down the time I usually leave the house for the bus stop and then I will look for a schedule of the buses in my city, to evaluate the times when each one passes above the hill to which I refer.
It is necessary that I clock the time spent between my home and the bus stop to which I am going, so that I can relate to the bus schedule.
I must also install a camera system at the bus stop to observe the times the cat arrives at that location.
Every day, for a month, I will write down the time I left home, the time I arrived at the bus stop, the time the cat arrived at the bus stop and the time the bus passed. At the end of this period, I will do average calculations to find out how many times our schedules have been synchronized. Through these data I will conclude whether the hypothesis is false or true.
which of these is the most ethical reason for using a simulation rather than an experiment with live animals
Which of the following are human activities that can
negatively impact ecosystems?
-Agriculture
-Earthquake
-Plastic pollution
-Drought
Answer:
Option C is the correct answer.
Explanation:
Agriculture however dont harm or give negative impact on the nature.Earthquake is a natural disaster which is not caused by human.Plastic pollution leads to imbalance in ecosystem as many people burn it which causes imbalance in carbon oxygen cycle. it also destroy the quality of soil.Drought is just a condition where there is no rainfall.Hope it helps...
what is the term that describes what occurs when genetic drift results in the formation of a new population that has less variation than the original population had A. Speciation B.Founder effect C.Mutation D. Sexual selection .
Answer:
A. Speciation
Explanation:
Speciation is how a new kind of plant or animal species is created. Speciation occurs when a group within a species separates from other members of its species and develops its own unique characteristics.
When the genetic drift occurs due to various factors and results in the formation of a new species it is called speciation. Thus, option A is correct.
What is speciation?Speciation is the formation of a distinct species from the original population because of the genetic drift that caused evolutionary changes essential for survival.
The species are separated from their original population leading to variation in the gene pool resulting in reproductive isolation and finally, the new species is formed.
Therefore, option A. speciation results in distinct species.
Learn more about speciation here:
https://brainly.com/question/9589072
#SPJ2
answer the questions above
Answer:
Hey there!
3) Well injection is usually done through the vein because they need the substance to go into the blood.
4) Some people believe that the heart is on the left side because its the left ventricle and atrium responsible and when people hear left they think the heart is on the left.
5) People living in high altitudes don't get as much oxygen so their bodies evolved into carrying ,more RBC so more oxygen is carried into their bodies.
Hope this helps :)
what factor is found in a scientific claim
Answer:
similar results in multiple tests of the claim
Explanation:
on some of my study cards
Maria is concerned because she has been exposed to a small amount of radiation during an X-ray. What is her doctor most likely to tell her? Radiations from X-rays is not a mutagen. Mutagens have no effect on the body unless you have inherited them. Small amounts of a mutagen often do not have an effect on health. Severe mutations are usually caused by small amounts of a mutagen.
Answer:
Small amounts of a mutagen often do not have an effect on health
Explanation:
X-ray is a form of electromagnetic radiation used as an imaging tool to view internal structures. X-ray radiation occurs when a charged particle hits a material at a high wavelength.
Exposure to X-ray radiation has been shown to cause serious health concerns as they are known to be mutation-inducing i.e. mutagenic, when exposed to in high quantities or doses. Therefore, in the case of Maria who was exposed to a small amount of X-ray radiation, the doctor would likely tell her that small amounts of a mutagen (X-ray) often do not have an effect on health.
Answer:
C, Small amounts of a mutagen often do not have an effect on health.Explanation:
hi ^o^
Levels of Organization of Living Things Now that you have learned about tissues, organs, and systems, use this graphic organizer to jot down your knowledge of atoms and cells, making connections to what your just learned about tissues, organs, and systems. DONT TRY TROLLING OR SCAMMING I WILL REPORT YOU
Answer:
Levels of Organization of Living Things is the hierarchy of complex biological structures arranged from the simplest to complex structures.
Levels of Organization of Living Things of the given biological structures are as follows:
Atoms: Acellular level, that is the smallest unit of all the organisms.
Cells: Cellular level, that is basic and functional unit of all the organissm.
Tissues: Multicellular level, that are a functional group of cells.
Organs: Multicellular level, that are functional group of tissues.
Organ System: Multicellular level, that are functional group of organs.
Organism: Ecological levels and they are basic living system made up of at least one cell.
How might scientists compare the efficiency of different energy sources?
A. None of these.
B. Weigh them to compare their masses.
C. Use a mass spectrometer to determine their chemical makeups.
D. Burn them and see how hot they can make a water sample.
During labor, certain hormones are released that cause the contraction of the uterus in order to push the baby out. When those hormones are sensed by the glands of the endocrine system, they secrete more of that hormone which keeps labor going until the baby is born.
Answer:
The endocrine system assists in maintaining and regulating different functions of the body by producing and discharging hormones. It comprises glands situated throughout the body, which produce chemicals known as hormones directly into the blood. The levels of hormones in the blood are monitored by a highly unique homeostatic mechanism known as feedback.
The two kinds of feedback are common, that is, negative and positive feedback, of this positive feedback, is the rare mechanism. It augments the changes done rather than opposing them. For example, the discharging of oxytocin from the posterior pituitary gland at the time of labor is an illustration of a positive feedback mechanism.
The stimulation of the muscle contractions, which pushes the baby via the birth canal is done by oxytocin. This discharging of oxytocin leads to an augmented or stronger contraction at the time of labor. This contraction is enhanced and intensify until the baby comes out of the birth canal. However, when the stimulus to the pressure receptor terminates, the generation of oxytocin ceases, which eventually results in the stopping of labor contractions.
Answer:
positive
Explanation:
e2020
In this project, you will analyze claims about the causes of inherited genetic variation. You will then make your own claim based on prior knowledge. Next, you will defend your claim by conducting research to gather information that supports it. Finally, you will present your claim and defense in a typewritten paper.
Answer:
The two major causes of the inherited genetic variation are 1-mutations during DNA replication and 2-crossing over during meiosis
Explanation:
The mutations are changes in the genetic information that may be inherited when they occur in germline cells (i.e. sperms and ova). Mutations include single nucleotide polymorphisms (SNPs), insertions and deletions (collectively named indels), and major chromosome arrangements such as, for example, aneuploidy, centric fusion, duplications, etc. On the other hand, the crossing over or recombination is the exchange of genetic material between non-sister chromatids of homologous chromosomes during Prophase I of Meiosis. Recombination is a phenomenon that generates new genetic combinations in the gametes and thus increase genetic diversity. Both germline mutations and crossing over events increase genetic variation in the offspring of the next generation, thereby these phenomena represent sources of inherited variation.
What are the missing products in this model? Check all that apply. 2 ATP 4 ATP 2 pyruvic acid 2 NAD+ CO2
The given question is incomplete as the model is missing from the question, however, the correct model is attached with the answer :
Answer:
The correct answer is - 2 ATP and 2 pyruvic acids.
Explanation:
The given model represents the glycolysis pathway which is the first of the key metabolic step of cellular respiration. It helps in producing the energy in form of ATP through breaking down a glucose molecule into 2 molecules of pyruvic acid and with a series of enzymatic reactions.
This process also releases energy in the form of 2 molecules of ATP and NADH. The pyruvate or pyruvic acid molecules then moves to the link reaction, where acetyl-CoA is produced.
Thus, the correct answer is - 2 ATP and 2 pyruvic acids.
Answer:
2 ATP 2 pyruvic acid
Explanation:
edge 2020
A scientist is attempting to produce a large quantity of Insulin. In order to transfer the gene for Insulin production into the bacteria that will be
making it, the scientist should use an
A. Bacteriophage
B. Micropipette
C. Escherichia coli
D. Virophage
To transfer the gene for Insulin production into the bacteria that will be making it, the scientist should use a Micropipette. The correct option is B.
What is a micropipette?A micropipette is an electronic lightweight pipette. The topmost part is called the plunger, the bottom is the pipette from where the liquid is transferred. It has a measurement scale to measure.
The transfer of genes for insulin production. The gene transfer can be done accurately with measurement, so a micropipette will be used here.
Thus, option B. Micropipette is correct for the transfer of genes.
Learn more about micropipette, here:
https://brainly.com/question/17346176
#SPJ2
Calcium hydroxide:_______.
a. cannot be placed under direct composite resins because it will inhibit polymerization.
b. stimulates the production of reparative dentin.
c. functions as a thick base to support extensive restorations.
d. consists of a resin in an organic solvent.
Hi there! Hopefully this helps!
--------------------------------------------------------------------------------------------------------
The answer to your question is B.
"Calcium hydroxide stimulates the production of reparative dentin."
Global warming is associated which of the followingIn a biology class, your friend had to read Jared Diamond’s essay The Worst Mistake in the History of the Human Race, which details the drawbacks of sedentary life and agriculture. Your friend wants to know why humans continued to farm in the face of disease and other issues. What would be a valid response? Group of answer choices?
Answer:
The correct answer would be - Having reliable access to food and being able to produce more calories per unit of land available led to population increase.
Explanation:
An increase in disease, sedentary agriculture, and increase in environmental degradation are three problem that is associated with the farming.
There are more benefits to continue agriculture is the ability of human kind to produce a food and access to plenty of food consistently which will led to increase the population.
Thus, the correct response would be - Having reliable access to food and being able to produce more calories per unit of land available led to population increase.
The theater sold 562 tickets to the concert at a price of $6 each. Use the distributive property to find the product of 6 × 562. 6(562) = 6(500) + (60)(2) = 3,120
Answer:
1,897,087=1,900,207.2=3,120 (the equasion you gave when distributed)
Answer to the question(Money made): ($)3,372
Explanation:
solved it out by multiplying
Answer:
Answer to the question(Money made): ($)3,372
Explanation:
Explique cómo podemos hacer para trasladar una caja de 50 kg desde planta baja hasta un primer piso que presenta una inclinación de 40°, que tipo de máquina simple utilizaría.
Answer:
rueda y eje
Explicación:
La rueda y el eje es un tipo de máquina simple que se utiliza para mover las cargas. Consiste en ruedas y un eje que puede levantar cargas pesadas y mover esas cargas de un lugar a otro aplicando menos fuerza. Por lo tanto, la máquina que consta de rueda y eje es la mejor opción para mover una caja de 50 kg desde la planta baja hasta el primer piso que tiene una inclinación de 40 °. Esta caja se puede colocar sobre una máquina simple compuesta de rueda y eje y se puede mover aplicando fuerza desde un lado.