Answer:
the answer is nucleus
Explanation:
Organelles are the cellular structure that performs various functions. The organelle nucleus directs all the activities of the cell. Thus, option a is correct.
What is a nucleus?The nucleus is an organelle present inside the cell and has the most vital role in the functioning and hereditary. It controls majorly all activities in the cell including growth, inheritance, metabolism, etc.
It is enclosed in a nuclear membrane that separates it from the cytoplasm and is the region where the process of replication and transcription takes place. It is the control center that directs and regulates the cellular activity that is essential for the cell to survive.
Therefore, a nucleus is an organelle that regulates cellular activities.
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Which best describes a situation in which an archer's aim was precise but not accurate?
A.a group of arrows that are all relatively near the target but are not close to each other
B.a group of arrows that are close to each other but not near the target
C.a group of arrows that are all right on the bullseye of the target
D.a group of arrows that are not near the target or each other
Answer:B
Explanation:
when any arrow will be close to mean(center)position it will be accurate
Answer:
a group of arrows that are all right on the bullseye of the target
Explanation:
what converts solar energy (sunlight) into chemical energy through photosynthesis
Explanation:
Photosynthesis in plants converts solar energy into chemical energy using electrons and protons from water. ... The electrons go to the chlorophyll, while the protons contribute to a proton gradient that is used to power the synthesis of a second energy-carrying molecule,
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Answer:
Hello!
Your answer is PLANTS!
Explanation:
During Photosynthesis, PLANTS absorb the radiation from the sun (sunlight/heat) and convert it into chemical energy (glucose/starches etc)
The green pigments on the leaves are called CHLOROPHYLL and the main purpose of them is to act like Solar Panels and absorb the light energy (solar energy)
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What are the three stop codons? What is the start codon?
Answer:
UAA, UGA and UAG are the stop codons.
And AUG or methionine is the start codon.
Explanation:
Hope it helps.
Several centers (and their associated motor tracts) in the cerebrum, diencephalon, and brainstem, which may issue somatic motor commands as a result of processing performed at a subconscious level, were long known as the ________, but is actually now considered inaccurate and misleading.
Answer:
The correct answer is "reticular formation".
Explanation:
The missing options of this question are:
A) medial lemniscus
B) pyramidal system
C) anterolateral system
D) reticular formation
E) extrapyramidal system
The correct answer is option D) "reticular formation".
The term "reticular formation" was coined to mention a set of interconnected nuclei located along the brainstem, including the cerebrum, diencephalon, and the brainstem itself. Nowadays this term is considered inaccurate and misleading, since it was never well defined and some authors may include some structures that other author do not consider as part of the "reticular formation".
How many cells are in zygote
Answer:
In humans, both sperms and ova contain 23 chromosomes.
Explanation:
During fertilization, the diploid chromosome number 46 is regenerated in the zygote. After 24 hours of fusion, human zygote starts to divide by mitosis, commencing the embryonic period. The zygote is divided into 2-cells, 4-cells, 8- cells and then 16-cells
Answer:
two cells, then four cells, eight cells, 16 cells, and so on.
Explanation:
A scientist is investigating the properties of two different biological membranes that have different amounts of cholesterol in them. Which of the following would accurately describe the membrane that has more cholesterol compared to the membrane with less cholesterol in it?
a) The membrane with more cholesterol will have increased fluidity at all temperatures compared to the membrane with less cholesterol.
b) The membrane with more cholesterol will have increased fluidity at low temperatures and lower fluidity at high temperatures compared to the membrane with less cholesterol.
c) The two membranes will have the same degree of fluidity at all temperatures.
d) The membrane with more cholesterol will have decreased fluidity at low temperatures and lower fluidity at high temperatures compared to the membrane with less cholesterol.
Answer:
B - The membrane with more cholesterol will have increased fluidity at low temperatures and lower fluidity at high temperatures compared to the membrane with less cholesterol.
While synthesizing a new blue pigment, a chemist notices that the new compound accumulates between an aqueous (water) environment and a hydrophobic environment. When added to a mixture of oil and water, the pigment creates a blue ring around the droplets of oil. Which of the following statements best describes this new pigment?
A. The pigment is amphipathic, having polar and nonpolar regions.
B. The pigment is probably hydrophobic and is attempting to bond with the oil.
C. The pigment is hydrophilic and will not form hydrophobic bonds with the oil.
D. The pigment is a polar molecule and is forming hydrogen bonds with both the water and oil molecules.
E. The pigment is neither polar or nonpolar, but is apolar.
Answer: C
Explanation:
Does not build hydrophobic bonds with oil because it is hydrophilic.
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What can he assume about the number of adenine?
The number of adenine bases will be equal to the number of guanine bases.
The number of adenine bases will be equal to the total of all the other bases.
The number of adenine bases will be equal to the number of thymine bases.
The number of adenine bases will be half of the number of cytosine bases.
Answer:
The number of adenine bases will be equal to the number of thymine bases.
Explanation:
Hope it helps.
according to Chargaff, there is a stoichiometric ratio of pyrimidine and purine bases so, The number of adenine bases will be equal to the number of thymine bases.
What affect will adding sugar have on the viscosity of water? As a real-world application, how can this experiment be beneficial? What is the purpose of the lab?
Answer:
If you add more sugar to water than the viscosity will be more intense, The independent variable is the amount of sugar you add to the water, The dependent variable is the viscosity of water. The control variables are the source of water, the temperature of the water, and the amount of water.
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The tail portion of an individual phospholipid molecule: Please choose the correct answer from the following choices, and then select the submit answer button. is hydrophobic and nonpolar. is hydrophilic and nonpolar. is hydrophobic and polar. is hydrophilic and polar. contains bonds with unequal sharing of electrons.
Answer:
The correct answer is - hydrophobic and nonpolar.
Explanation:
Phospholipids are amphipathic molecules which means they show the both hydrophobic and hydrophilic properties. This property is due to the fact that they have a phosphate head that is hydrophilic, and polar while there are also two hydrophobic nonpolar fatty acid tails.
The fatty acid chains have a cis double bond and are the uncharged, nonpolar tails, which are hydrophobic.
Thus, the correct answer is - hydrophobic and nonpolar.
Which of the following are likely impacts of
overfishing?
-The populations of higher order consumers decrease
-Oxygen dissolved in sea water decreases
-The biodiversity of the ecosystem decreases
-Large numbers of producers are removed from the
ecosystem
Answer:
-The populations of higher order consumers decrease
Explanation:
More fish are being killed meaning less food for consumers which means that tertiary consumers will be left with less food. One small problem can have a devastating effect.
The wells that contain the DNA samples are placed next to the negatively charged electrode in the electrophoresis box (chamber) because _______. Group of answer choices DNA strands have both a positive and a negative charge DNA is negatively charged DNA is positively charged DNA has no electrical charge
Answer:
DNA is negatively charged
Explanation:
Electrophoresis: In biology, the term "electrophoresis" is described as one of the different laboratory technique that is being utilized to separate protein molecules, DNA, and RNA one the basis of their electrical charge and size. Therefore, a specific amount of "electric current" is being used to move different molecules that are required to be separated through a "gel". The given gel contains pores that generally works like a "sieve" and thus allows every small molecule to proceed faster as compared to the larger molecules.
DNA stands for "deoxyribonucleic acid" is determined as a long molecule that ought to contain an individual's unique "genetic code" and generally carried information associated for making proteins in an individual's body.
In the question above, the correct answer is "DNA is negatively charged".
The samples of DNA are placed next to the negatively charged electrode in the electrophoresis as DNA is negatively charged.
What is electrophoresis?It is a laboratory technique, which is used to distinguish RNA, DNA or molecules of protein on the basis of their electrical charge and size. In the process, an electric current is utilized to move molecules to be separated via a gel. The gel comprises pores that functions as a sieve, which permits smaller molecules to move faster in comparison to larger molecules.
DNA is a negatively charged molecule, thus, when it is used in the process of electrophoresis, the migration of DNA will take place towards the positively charged electrode. Through the gel, the DNA with shorter strands will move more briskly in comparison to the longer strands leading to the formation of fragments being aligned in order of size.
Thus, the samples of DNA are placed next to the negatively charged electrode as they are negatively charged.
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Why is carbon-14, with a half-life value of 5,730 years, not appropriate for finding
the absolute age of dinosaur fossils?
Answer:
because dinosaurs existed millions of years ago, carbon-14 has a short life that is too small to compare millions.
Explanation:
When asked to analyze a sample of marine life, you notice the animal has an incomplete digestive tract, stinging cells, and swims by propeling water through itself. You conclude that you are observing a cnidarian polyp. True or False
Answer:
The correct option is;
True
Explanation:
The digestive system of Cnidarians is incomplete having only one single opening which is the gastrovascular cavity the representing the anus and the mouthof the Cnidarians
The hollow body of the Cnidarian polyp which allows water through has tentacles at the top bearing cells meant for stinging
A prey caught by the tentacles is drawn in to the mouth and ingested
The Cnidarians are able to attach to surface due to their attachment adapted lower end
The correct option is therefore true.
The rate of a reaction catalyzed by an enzymes usually ________ with temperature; however, at temperatures above the optimum range ________. The rate of a reaction catalyzed by an enzymes usually ________ with temperature; however, at temperatures above the optimum range ________. decreases; prosthetic groups are necessary increases; protein denaturation occurs decreases; the reaction proceeds without the enzyme increases; the reaction proceeds without the enzyme increases; the direction of the reaction reverses
Answer:
increases; protein denaturation occurs
Explanation:
One of the characteristic of enzymes is the sensitivity to temperature .
Enzymes are sensitive to the changes in the environmental temperature.The enzymatic activities increases with increase in temperature,up to the optimum of 37 degrees in most animals.
However,once the optimum temperature has been exceeded,enzyme activities drops.This is because below optimum the rate of collision between the enzyme active sites and substrate molecules is very high,therefore more products are formed which increases the rate of reactions.
At temperature above the optimum,the high temperature breaks the bonds,especially the hydrogen bonds holding the 3D structure of the active sites.Therefore,substrate molecules can not fit into the active site,and therefore enzymatic actives of the enzyme is affected,and the enzyme is said to be denatured
7) The evolution of animal species has been prolific (current estimates of species numbers reach into the tens of million). Much of this diversity is a result of the evolution of novel ways to ___.
Answer:
The options are
A) arrange cells into tissues
B) form an embryo and establish a basic body plan
C) sense, feed, move and choose mates
D) reproduce
E) I don't know
The answer is C) sense, feed, move and choose mates
Evolution occurs after a long period of time and it occurs as a result of organisms adapting to new environmental conditions. Much of this diversity is a result of the evolution of novel ways to sense, feed, move and choose mates and the they are features which are essential in an organisms survival.
Which phrase describes one main feature of the atmosphere? protects Earth’s surface includes organisms in the air, on land, and in water consists of rocks, minerals, landforms, and Earth’s interior comprises oceans, lakes, rivers, streams, and groundwater
Answer:
A) protects earth's surface
Explanation:
took the test
The phrase describes one main feature of the atmosphere is protects Earth’s surface is correct.
Why do we need an atmosphere?Not only does it contain the oxygen we need to live, but it also protects us from harmful ultraviolet solar radiation. It creates the pressure without which liquid water couldn't exist on our planet's surface. And it warms our planet and keeps temperatures habitable for our living Earth.
Thus, protects Earth’s surface is correct.
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Which of the following is an accurate statement about pathogens?
A. Infection and disease are caused by pathogens living in infectious agents found in the environment.
B. Pathogens, which cause infection and disease, are the most abundant organisms in the environment.
C. Most organisms in the environment are harmless, except for pathogens, which can cause disease.
D. The environment is rich in infectious agents that transmit disease through pathogens. Please help!!!!
Answer:B
Explanation:
Write any five points which helps everyone to orgasms faster.
Answer:
Here are my five -hot -cute -pretty -charming -gorgeous
Explanation:
-Hot = if she's hot she will make you wet
-Cute = if she's cute she will make your thing stick
Pretty = if she's pretty she's tolerable
charming = great vibes
gorgeous = makes you hard
In good-quality surface soil, approximately what percentage of the volume is made of mineral and organic matter?
Answer:
The chemical composition of the soil, the topography, and the presence of living organisms determines the quality of soil. In general, soil contains 40-45% inorganic matter, 5% organic matter, 25% water, and 25% air.
Explanation:
Answer:
50 percent
Explanation:
The composition of soils varies from place to place. But in good-quality surface soil, mineral and organic matter make up about half the volume. The other half is made of pore spaces that are filled with air and water.
You are a sales representative for a company that makes a new alternate fuel for vehicles. You have prepared a presentation for the environmental engineers to sell your new product. What question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment?
A. Do we have to change any parts of the vehicle to use this alternate fuel?
B. Will the vehicles get better fuel mileage with the alternate fuel?
C. How much greenhouse gas does your fuel produce compared with current fuel sources?
D. Is the alternate fuel more expensive than fossil fuel?
Answer:
C. How much greenhouse gas does your fuel produce compared with current fuel sources?
Explanation:
Answer A asks whether vehicles need to be changed to use the fuel.
Answer B asks whether the vehicles will get better mileage.
Answer C asks whether emissions will be better or worse than current emissions.
Answer D asks whether it will be more expensive than current fuel.
Hope this helps!
Answer:
C. How much greenhouse gas does your fuel produce compared with current fuel sources?
Explanation:
Plato.
Joyce Kilmer Forest in western North Carolina contains a stand of trees that have never been logged. Some of the trees are over 400 years old and 20 feet in circumference. Which describes this type of forest
Answer:
old growth
Explanation:
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Describe TWO WAYS technology has created more waste by humans.
I need an answer now.
Answer:
Hazardous type: This type poses potential threats to the environment and human life. Battery wastes from thrown away technology.
Electronic waste or e-waste describes discarded electrical or electronic devices. Used electronics which are destined for refurbishment, reuse, resale, salvage recycling through material recovery, or disposal are also considered e-waste.
As células são os componentes fundamentais de todos os seres vivos, não sendo encontradas apenas nos vírus. Algumas pessoas costumam dizer que as células são formadas por membrana plasmática, citoplasma e núcleo. Entretanto, nem todas as células possuem núcleo organizado, recebendo o nome de:
Answer:
Entretanto, nem todas as células possuem núcleo organizado, recebendo o nome de: células eucarióticas
Explanation:
As células eucarióticas são caracterizadas por possuir um núcleo definido, localizado no citoplasma. A diferença que tem com as células procarióticas é que o núcleo nelas está em uma região do citoplasma chamada nucleoide.
Além disso, as células eucarióticas têm um nível mais alto de complexidade em relação à sua informação genética, podendo realizar dois processos para replicar seu DNA: mitose e meiose
At a neuromuscular junction Group of answer choices neurotransmitters are released. actin and myosin filaments slide past one another. intercalated discs are synthesized. troponin and tropomyosin exchange places.
Answer:
Neurotransmitters are released
Explanation:
At a neuromuscular junction, action potential that arrives there causes the release of the acetylcholine into the synapse. This then binds to the receptors that span across the surface of the motor end plate triggering muscle contraction with the release of calcium.
It acts as a transmission passageway for action potential between the end of a motor nerve and a muscle.
Two plants that are pure bred are crossed. One is short and one is tall, Tall is dominant. If two of their offspring are crossed, what are the
expected phenotypes for the next generation of offspring (F2 generation)?
A. 50% tall, 50% short
B. 100% tall
C. 75% tall, 25% short
D. 100% short
Answer:
C
Explanation:
after doing the genetic cross the parents will be TT so when you cross you get all are Tt if you cross F1 you get a ratio of
1tall:2heterozygous tall:1short
so tall are 75%and short is 25%
The answer to this question is option c. When two of their offsprings are crossed the expected phenotypes for f2 is 75% tall and 25% short.
When a tall and short plant are crossed together. All the plants that are their offspring would all be tall, T.
These offspring are the result of the first crossing. They all now have there genes as TS from their parents TT and SS gene.
When these off springs are crossed, they would have some off springs that are tall and some that are short. This is going to be a crossing of TS and TS. Given that they all possess the tall and short gene.
The ratio of tall to short children they would have according to Mendel is 3:1.
75% : 25% = 3:1
The tall pants are dominant
In conclusion when we divide 75 by 25 we get a ratio of 3:1. This is the ratio of expected phenotypes for The second generation.
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Gentoo penguins present a potential mate with a pebble. Emperor penguins have a specific call and movement that they make to attract a mate. Which type of isolation do these penguins demonstrate?
Answer:
The correct answer is - behavioral isolation.
Explanation:
Behavioral isolation is a type of isolation that take place in case of different mating behaviors development that can not be recognized or preferred by the other members of the same species or population share same environment.
The most common example of behavioral isolation is difference in matting calls of the members of the same species present in same geographic area such as Gentoo and Emperor penguins.
Thus, The correct answer is - behavioral isolation.
Answer:
the answer is b
Explanation:
100% edg test 2020
In some parts of Africa, the frequency of heterozygosity for the sickle cell anemia allele is unusually high, presumably because this reduces the frequency of malaria. Such a relationship is related to which of the following?
a) Mendel's law of independent assortment
b) Mendel's law of segregation
c) Darwin's explanation of natural selection
d) Darwin's observations of competition
e) The malarial parasite changing the allele
Answer:
The correct option is C.
Explanation:
According to Darwin's Law of Natural Selection, a gene that benefits the organism and helps it produce healty offspring so that it can survive is supported by natural selection and will receive a positive feedback over.
The fact that the heterozygosity for sickle cell anemia helps with the survivability of malaria, which is a deadly disease, suggests that the heterozygosity is favored by the law of natural selection.
I hope this answer helps.
Non-polar molecules such as oxygen, carbon dioxide, and some vitamins
can easily cross the phospholipid bilayer.
A
True
B
False
Answer:true
Explanation:
: What is lymph? What is lymph? thick carbohydrate matrix that supports cells in various tissues of the body the portion of blood that contains red blood cells the layer of lipids that collects under the skin for protection and insulation protein-rich blood plasma that has left capillaries the portion of blood that contains white blood cells and platelets
ANSWER;
protein-rich blood plasma that has left capillaries
Lymph is un reabsorbed interstitial fluid which are trapped in the capillaries called lymph capillaries. it is pale in color(compare to red of the the blood),and continuously flood the body tissues for fluid balance and waste removal.
Macrophages and lymphocytes (WBC) are the principal cellular components,however it also contain proteins,lipids.It is similar to blood plasma,except for higher amounts of lipids but will lesser amount of WBC and platelets.
Its special channels are the lymphatic vessels of the lymphatic system,which are the lymph nodes and vessels.
The functions of Lymph are:
Responsible for the removal of tissues bathing the tissues(Interstitial fluids ) from the tissues.
Transport of fats from the lacteal during absorption.
Transport of WBC across from the L.nodes to the bone.
it also mediates in immune response,through the transport of antigen-presenting cells.
it is similar to blood because it is a circulating fluids,through special vessels,and both linked by network of capillaries.
However, more wbc,rbc,platelets,oxygen are present in blood than the lymph. In addition because it returns proteins,it is said to contain proteins,but in actual sense if lacks protein