BIOLOGY HIGH SCHOOL

Summarize the influence Charles Darwin's experiences in the Galapagos had on his later development of his theory of Natural Selection.

Answers

Answer 1
Answer: Charles He saw the two islands and found two nearly the same birds but one of them had longer beaks. The other had blunter, stronger beaks. They were on two different islands. Charles Darwin decide that they adapted to eat the nuts that grew on their island. The ones with the stronger beaks had harder, bigger nuts than the ones with weaker, longer beaks who had smaller, softer nuts.

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What prevents the Na+ and K+ gradients from dissipating?a.H+-K+ ATPase
b.Na+ and K+ leaks
c.Na+ cotransporter
d.Na+-K+ ATPase

Answers

D. It is an enzyme which is an active form of transport, pumping Na out of the cell while pumping K into the cell against their concentration gradients. This transport maintains the gradient.

Final answer:

The Na+-K+ ATPase, a membrane protein pump, prevents the sodium (Na+) and potassium (K+) gradients from dissipating by actively transporting these ions against their concentration gradients.

Explanation:

The mechanism that prevents the Na+ and K+ gradients from dissipating is the Na+-K+ ATPase. This is an integral membrane protein pump found in almost all animal cell membranes. This pump carries out the function of moving 3 sodium ions out of the cell and 2 potassium ions into the cell during each cycle of pumping. This is done at the expense of one ATP (adenosine triphosphate) molecule, hence the name ATPase. This active transport work against the concentration gradients of these ions, hence maintaining their respective gradients across the cell membrane.

Learn more about Na+-K+ ATPase pump here:

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Which of the following is an example of a nonpoint source of freshwater pollution?A.) pesticide runoff from farm fields
B.) leaking toxic waste landfill
C.) sewage treatment plant
D.) factory waste piped into a stream

Answers

A.) pesticide runoff from farm fields

Freshwater pollution can be defined as the contamination of inland water with substances that affect its natural use and it can be caused by chemicals, petroleum, fecal waste, sediments and fertilization. Thus, non-point pollution is the process where pollution result from many diffuse sources such as agricultural areas which drain into the wind-borne debris or rivers.

Where do most producers get their energy from?a. from the water
b. from the sun
c. from other organisms
d. from the air

Answers

Answer: b. from the sun

Explanation:

Most of the producers are the plants and other autotrophic organisms that obtain their energy from the light energy of sun. These organisms use the light energy from sun to convert this energy into chemical energy of food by the process of photosynthesis. In the absence of sunlight energy photosynthesis will not occur. The ingredients like water and carbon dioxide are used to produce oxygen and carbohydrates in the presence of sunlight.  
The answer is b, because all energy comes from the sun which then goes to the autotrophs( producers) who make there food, and then the omnivores eat the autotrophs and the carnivores eat the omnivores or anything that consists of meat.

Why mitochondria is also known as powerhouse of the cell?

Answers

This is because mitochondria performs anaerobic respiration due to the presence of oxygen .Hence this powers cell activities to make new protoplasm and also to provide energy.Especially in plants when transporting food ,it does it via active transport which requires energy.Hope understand.

Which nucleic acid base is found in RNA but NOT in DNA?

Answers

Answer: It's uracil!

Explanation: The four nirogen bases in DNA are adenine, guanine, thymine, and cystosine. In RNA, thymine is simply replaced with uracil.

Which types of rna are involved in protein synthesis?

Answers

mRNA (Messenger RNA)
rRNA (Ribosomal RNA)
tRNA (Transfer RNA)

Answer:

there are 3 types of rna in protein synthesis

Explanation:
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