Answer:
The correct answer is
D. yes-or-no questions about easily observable characteristics.
Explanation:
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Yes-or-no questions about easily observable characteristics. So, the correct option is D.
What are Dichotomous keys?A dichotomous key is defined as a device designed by scientists to help its users identify a particular type of object and organism based on physical characteristics.
A dichotomous key is divided into two sections which usually contain specific questions with two options that are yes or no in each step. When a question is answered, the key directs the user to ask the next question until the user is able to correctly identify the name of the unknown organism.
Thus, Yes-or-no questions about easily observable characteristics. So, the correct option is D.
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Is cloning an organism the same as cloning a gene
Answer:no. In nature, some plants and single-celled organisms, such as bacteria, produce genetically identical offspring through a process called asexual reproduction. In asexual reproduction, a new individual is generated from a copy of a single cell from the parent organism.
Natural clones, also known as identical twins, occur in humans and other mammals. These twins are produced when a fertilized egg splits, creating two or more embryos that carry almost identical DNA. Identical twins have nearly the same genetic makeup as each other, but they are genetically different from either parent
Gene cloning produces copies of genes or segments of DNA. Reproductive cloning produces copies of whole animals. Therapeutic cloning produces embryonic stem cells for experiments aimed at creating tissues to replace injured or diseased tissues.
Gene cloning, also known as DNA cloning, is a very different process from reproductive and therapeutic cloning. Reproductive and therapeutic cloning share many of the same techniques, but are done for different purposes.
Explanation:
Your mom has started complaining to you about her varicose veins and is thinking about surgery. What true information could you tell about varicose veins?
Answer:
One very true and essential information to know about varicose veins is that there is often re-occurrence following after surgery.
Explanation:
Varicose veins are a group of large, benign, twisted, and superficial veins on the skin surface. They may come with no side effect in some sufferer (asides from the physical appearance), and can cause chronic pain and discomfort in others, usually pointing to an underlying circulatory problem. Varicose veins are caused by damaged or weak valves in the veins, and complications like bleeding might occur. Some people with the risk of developing this disease are obese people, people with genetic tendencies, and usually pregnant women. Treatment methods includes compression stocking, a lifestyle change, and some medical procedures like surgery. After surgery, there is usually re-occurrence.
If a forest contained most light-colored trees, which type of moth would you expect to be most common
Answer:
Light colored moths(Peppered moths)
Explanation:
Because they can blend in to their enviornment and not get eaten by predators
Answer:
light colored moths
Explanation:
because they can blend into their environment
Larry recalls his first memory of riding a red tricycle at the age of 4. Larry’s memory is: True False
Answer:
True
Explanation:
False memory refers to remembering an event differently from the way it happened or remembering events that never happened at all.
Larry's memory is a true memory because it doesn't sound like something that could be made up. Also, most children ride tricycles around the age of 4 or even younger.
Hope that helps.
Which type of selection leads to increased phenotypic and genetic variation? directional selection disruptive selection stabilizing selection species selection
In directional selection, a population's genetic variance shifts toward a new phenotype when exposed to environmental changes. Diversifying or disruptive selection increases genetic variance when natural selection selects for two or more extreme phenotypes that each have specific advantages.
Answer:
Species selection
Explanation:
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Unit Test
How does increasing the distance between charged objects affect the electric force between them?
O The electric force increases because the distance has an indirect relationship to the force.
The electric force increases because the distance has a direct relationship to the force.
O The electric force decreases because the distance has an indirect relationship to the force.
O The electric force decreases because the distance has a direct relationship to the force.
Answer:
C. The electric force decreases because the distance has an indirect relationship to the force.
Explanation:
The electric force decreases because the distance has an indirect relationship to the force. Therefore, the correct statement is option C.
What happens when the distance between two charged items grows?As the distance between two charged items grows, the electric force between them diminishes. Because of the inverse square law, which states that the force of attraction or repulsion between two charged objects diminishes as the square of the distance between them rises, this is the case.
The force exerted by two charged objects will be decreased to one-fourth of its initial strength if the distance between them doubles. Similar to this, if the distance is quadrupled, the force loses 90 percent of its initial power. As a result, the electric force between charged objects lessens with increasing distance.
The farther the distance between charged objects, the weaker the electric force between them becomes due to the decrease in the strength of the electric field. This relationship follows an inverse square law.
Therefore, electric force decreases because the distance has an indirect relationship to the force.
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Obsessive-compulsive disorder has a(n) __________ genetic basis.
weak
strong
immeasurable
moderate
Answer:
Strong
Explanation:
Obsessive-compulsive disorder (OCD) is a psychiatric condition that affects both children and adults. In the last years, it has been shown that genetic and environmental factors contribute to the etiology of this disease. By applying genetic mapping techniques, different genes were observed to be associated with OCD. Moreover, it has also been discovered that OCD is a trait that has a complex pattern of inheritance (i.e., it is a quantitative trait). However, it is important to note that more research is needed to fully understand how genetic factors influence OCD condition.
Obsessive-compulsive disorder is defined as a mental illness in which repeated thoughts or obsessions occur repeatedly. OCD is partially genetic and half of the cause of OCD is genetic.
The correct word for the given blank is:
Obsessive-compulsive disorder has a(n) strong genetic basis.
Obsessive-Compulsive Disorder is a mental condition in which an adult or child can get affected.
The environmental and genetic factors contribute to the etiology of the disease. Genetic mapping and other research techniques have shown some of the genes are associated with OCD.
However, the research is still going on the fully understand the inheritance pattern of OCD.
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Which source would be the least reliable? a nonfiction book written by a scientist a peer-reviewed scientific journal an encyclopedia an advertisement
What makes ribosomal RNA useful as a molecular clock? (2 points) A large portion of the DNA ring is not vital to structure or function, allowing it to accumulate neutral mutations. Its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. A slow mutation rate makes it useful for determining evolutionary relationships between ancient species. It is only found in select organisms, making it easier to compare relationships between species that have it.
Answer:
The correct statement is that a slow mutation rate makes it useful for determining evolutionary relationships between ancient species.
Explanation:
The rRNA or ribosomal RNA has an application as a molecular clock because of many factors. It exhibits a very slow mutation rate, that is, around one million years because of which it stays highly conserved in all the organisms. In the ribosomal RNAs of two organisms, the degree of mutations can be associated directly with the time they were originated in the past.
In supplementation, it possesses essential biological function because of which it can be witnessed in almost all the species.
Answer:
A slow mutation rate
A pharmaceutical company is working on a drug to slow the spread of Ebola. Which of the following should be the company's focus?
a. Sanitizing the drinking water
b. Protecting the food supply
c. Person-to-person contact
d. Killing the insect vector
Answer:
C
Explanation:
Although Ebola isn't transferred by the air and through touch. Bodily fluids like sweat, saliva, urine, breastmilk, semen, and vomit all transmit the disease, if a person gets it in a cut or is directly introduced by it (sexual intercourse.)
Nonvascular plants lack _____. a. zygotes b. gametes c. seeds d. spores e. chloroplasts
Answer: Nonvascular plants lack seeds
The Non vascular plants lack seeds as there is no seed found in the non vascular plants. Thus, option C is correct.
What is the example of Non vascular plants?
The example of Non vascular plants is Ferns which has been refer to the vascular plants which usually reproduce via spores and they neither have seeds nor they have flowers as well as they also show alternate of generation in which diploid sporophyte is a dominant phase of the life.
The diploid sporophyte produces spores through meiosis and the spores divide through mitotic divisions and get developed into haploid gametophytes. The gametophyte produces haploid gametes which fertilize to produce a diploid zygote. The zygote develops and grows into mature sporophyte through mitotic divisions.
Therefore, The Non vascular plants lack seeds as there is no seed found in the non vascular plants. Thus, option C is correct.
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what doesnt occur in translation
Answer:
the sequences of nucleotides on the TRNA is read in triplet's called codons is not a key in the process of translation.
Mutations in the three genes are all autosomal recessive and the three genes are unlinked.Two different true breeding mice have been isolated that do not make any antigen (neither 1 or 2). A Cross of these two different mice produce F1 that make both antigens.What are the genotypes of the two parents?
Answer:
Let's call gene 1, 2, 3 as gene X, Y, Z respectively.
Parent 1 = xxYYZZ
Parent 2 = XXyyzz
(or vice versa)
Explanation:
Since all of the three mutations are said to be recessive and un-linked. According to the question statement, neither parents have the ability to make any antigen. When these two genotypes will be crossed, a genotype XxYyZz will be obtained. This one will be capable of producing antigen.
Explain why mutations that replace S/T/N residues with A/L/W residues in the N-terminal region of transmembrane proteins that function as cell surface receptors could significantly disrupt that utility of these proteins as receptors.
Answer:
Serine (S), Threonine (T) and Asparagine (N) are primary binding sites of carbohydrates, and thereby they are required to form glycoproteins (i.e., glycosylation products)
Explanation:
A transmembrane protein (TP) is a particular type of protein that crosses the cell membrane in order to enable the movement of ions and molecules. Transmembrane proteins are divided into alpha-helical and beta-barrel proteins. The N-terminal region of transmembrane glycoproteins can be required for N-linked glycosylation, which is an enzymatic mechanism capable of attaching oligosaccharides to proteins in order to form glycoproteins (glycans). N-linked glycosylation is a posttranslational protein modification that has distinct functions depending on the cell type and the protein region involved in such modification. For example, in the surface of immune cells, the N-linked glycans are capable of dictating the migration pattern of these cells.
A mosquito somatic cell contains 6 chromosomes. This means that ____ different combinations of chromosomes are possible in the mosquito’s gametes as a result of the random alignment of chromosomes during meiosis.
Answer:
8
Explanation:
The law of independent assortment of genes as proposed by Gregor Mendel states that the alleles of a gene will separate into gametes independently of the alleles of another. This means that during the metaphase stage of meiosis I, line up randomly at the metaphase plate of the cell in order to be separated independently.
According to the question, a mosquito has 6 chromosomes in its somatic cells. This means that 2n (diploid) = 6 Chromosomes. Hence, after meiosis, its gametes (n) will contain 3 chromosomes each. To find the number of different combinations of chromosomes possible in the mosquito’s gametes, we use 2^n where n represents the number of haploid chromosomes.
Hence, if 3 chromosomes are possible in a mosquito's gametes, 2^3 = 8 different combinations of chromosomes are possible in the gametes as a result of random orientation during the metaphase of meiosis.
why the tropics have more species than the poles of the Earth
Answer:
the tropics have more species because of the more humid enviroments because not many warm blooded animals can live near the poles. because of the abnormally cold temperatures, not many animals can survive unlike in tropical areas where there is a more vaste amounts of food and plant species, also shelter.
In 1998, paleoanthropologist Rick Potts published an article in The Yearbook of Physical Anthropology, a peer-reviewed journal. The article was titled “Environmental Hypotheses of Hominin Evolution.” In his paper, Potts claimed that great variations in environmental conditions over time were responsible for the adaptability of humans and the success of our species. Which would most likely be found in his paper? a review of modern human anatomical structure evidence of changing environmental conditions, with references the reasons competing hypotheses are wrong his opinion of what will happen to the survival of the human race
Answer:
Dr. Potts used environmental data to support environmental hypotheses capable of explaining human evolution
Explanation:
In this paper, the author stated that environmental factors have been fundamental for the emergence of adaptive traits during human evolution. In consequence, Dr. Potts explained how particular environmental factors and habitats might have shaped human evolution. For example, it has been hypothesized that dry savanna vegetation might have been a key environmental factor associated to the emergence of human traits including, among others, bipedality, making of tools from stones, the development of human brains, etc. In order to prove this hypothesis, the author recorded environmental data from different regions in Africa (Olorgesailie, Olduvai, Turkana, Zhoukoudian, etc), where it is believed that first hominids evolved about 6-8 million years ago.
ITS NOT B AND ITS NOT C
SOOO EITHER D OR A
Explanation
In the microarray analysis some genes, such as ERB-B2 and ESR1, have been found to be associated with particular disease or conditions such as cancer. Other genes, such as the ABC-B2 gene, are not associated with a disease but are involved in resistance to certain drugs or treatments. Why would it be useful to test for the expression of genes like the ABC-B2 gene on the microarray
Answer:
The expression of genes associated with drug resistance leads to the reduction in the effectiveness of drugs against cancer cells.
Explanation:
In cancer, drug resistance is produced when oncogenic cells are able to develop mechanisms of resistance against drugs such as, for example, chemotherapeutic agents. In these cases, therapeutic treatments become ineffective to fight against cancer cells and tumor progression. In consequence, it is imperative to trace the expression of target oncogenes associated with drug resistance in order to provide effective treatments to eliminate cancer cells.
What is the end result of the eukaryoic cell cycle?
A. no parent cells and two daughter cells
B. one parent cel and two daughter cells
C. two parent cells and one daughter cel
D. one parent cell and one daughter cell
Answer:
A. No parent Cells and two daughter cells
In imaginary fruit, white fruit color (W) is dominant over yellow fruit color (w) and disk-shaped fruit (D) is dominant over sphere-shaped fruit (d). If a plant true-breeding for white, disk-shaped fruit is crossed with a plant true-breeding for yellow, sphere-shaped fruit, what will the phenotypic ratios be for: Show all work
Answer:
See the answer below
Explanation:
Genotype of a true-breeding white, disk-shaped fruit = WWDD
Genotype of a true-breeding yellow, sphere-shaped fruit = wwdd
Crossing the two:
WWDD x wwdd
WwDd
All the offspring (100%) will have the genotype WwDd with white, disk-shaped phenotype.
Assuming the cross is advanced to F2:
WwDd x WwDd
W_D_ 9 White, disk-shaped (9/16)
W_dd 3 White, sphere-shaped (3/16)
wwD_ 3 Yellow, disk-shaped (3/16)
wwdd 1 Yellow, sphere-shaped (1/16)
(See the attached image for the Punnet's square)
Which of the following practices that are needed to run a nuclear power plant has a negative impact on both air and water
Answer:
The options are
a.cooling of the power plant
b.mining of uranium
c.storage of radioactive waste
d.monitoring the reactor
The answer is b.mining of uranium
Explanation:
Uranium is known as a radioactive element which is used as a fuel to power a nuclear energy plant. Mining of uranium could cause it to mix with air and water which results in contamination.
When contamination occurs and it gets into the body of humans or animals by inhalation or ingestion it poses a high risk of cancer and kidney damage.
Which glial cells support neurons metabolically
Why does deleting just one nucleotide cause a dramatic change in the amino acid sequence produced by translation
Answer:
The deletion changes the genetic code.
Explanation:
The sequence of nucleotides determines the order of amino acids in a protein, the order of amino acids determines the shape and the shape determines the function. A very good example of one misplaced nucleotide having tremendous effects is sickle cell disease, where thymine is replaced with adenine(CAC instead of CTC). It means that glutamic acid is replaced with valine. This alters the shape of the protein(Beta chain of hemoglobin). So the red blood cells are deformed and carry a lot less oxygen leading to a lot of symptoms just because of one misplaced letter.
Endothermic animals maintain their body temperature by increasing metabolic heat production in cool environments. Which food chain loses the most energy to cellular metabolism? algae → mosquito → spider → bat algae → mosquito → bat algae → mosquito → spider → snake algae → mosquito → bat → weasel
Fill in the blanks.
1. The phylum contains most common animals you are familiar with su
as eagles, dogs, foxes, and frogs.
2. While the earth is home to many members of this phylum, earthworms are
a member of
3. The most successful phylum on earth is which contains insects,
spiders, and crustaceans.
4. An animal that molts it exoskeleton is called a(n).
5. are cells that have the potential to become any type of cell; they hav
not yet received their genetic programming.
6. All members of the animal kingdom are multicellular, heterotrophic and
7. A starfish is a bilaterian deuterostome with symmetrical adults.
8. Complete the chart by describing what kinds of organs or tissues each type
germ layer becomes:
Moi
Answer:
1. chordata
2. nematoda
3. arthropoda
4. ecdysozoan
5. stem Cells
6. eukaryotic
7. radically
Chart answer:
Endoderm = Lungs, liver, pancreas, lining of gut organs
Mesoderm = Bone, muscle, heart, circulatory system
Ectoderm - Brain, nervous system, skin
Explanation:
Answer:
1. chordata
2. nematoda
3. arthropoda
4. ecdysozoan
5. stem Cells
6. eukaryotic
7. radially
8. Endoderm… Mesoderm becomes… Ectoderm becomes…
Lungs, liver, pancreas, lining of gut organs
Bone, muscle, heart, circulatory system
Brain, nervous system, skin
Explanation:
Scientific laws explain how and why something occurs on a scientific level.
Answer:
Answer. Scientific laws DO NOT explain how something, or why something happens. A scientific law can be thought of simply stating what happened. A scientific theory tries to explain how and why something happens on a scientific level.
Explanation:
What bone runs parallel to the fibula?
Answer:
Tibia bone runs parallel to fibula.
Answer:
the tibia runs parallel to the fibula
Explanation:
both bones are present in the part of leg below the knee
Explain how respiration occurs in plants. Someone please answer
Answer:
Respiration is the process includes plants,receive their energy for a chemical chain system is called respiration.
Explanation:
Respiration is the biochemical process , is the external environment the cell,special living a tissues.
Respiration is the process plants oxygen gas inhaled and the carbon gas exhaled out the plants.
During the respiration is the gas exchange process different parts of the plants:-ROOTS, STEMS, plants exchange respiration easily.
Roots are the underground part of the plant and present in the soil particles, and the night the respiration plants is prominent.
Respiration in stems air the diffused the various parts of the cell for passes respiration.
Leaves is the process that pores referred as exchange of gas and the leaves.
42) When yellow-seeded and green-seeded pea plants are crossed, all the offspring are yellow-seeded. When the F1 yellow-seeded plants are crossed to green-seeded plants, what is the hypothesized genetic ratio
Answer:
See the answer below
Explanation:
From the illustration, the yellow color trait is dominant over the green trait.
Assuming that yellow seededness is represented by the allele Y and green seededness by the alleles y. Y is dominant over y, hence a yellow seeded plant would be either YY or Yy while a green seeded plant would be yy.
For a cross between a yellow seeded plant and a green seeded plant to yield all yellow seeded offspring, it means that the parents are YY and yy.
(yellow)YY x (green) yy
F1 progeny: All Yy (yellow)
Now, Yy is crossed with green-seeded plant, yy.
Yy x yy
Yy Yy yy yy
Hypothesized Genotypic ratio
Yy = 1/2
yy = 1/2
Hypothesized Phenotypic ratio
Yellow seeded = 1/2
green seeded = 1/2
1. Escherichia coli is one of the most common causes of foodborne illness, yet it is also a common microorganism found within the human gut. What explains this disparity
Answer:
E. coli is commonly found in the large intestine of humans and other warm-blooded animals (2). These strains can be commensal, existing in a symbiotic state providing resistance against pathogenic organisms, or be pathogenic and cause diseases of intestinal and extra-intestinal sites
Explanation:
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