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Lisa [10]
2 years ago
9

Which process most likely enabled the formation of the early protists? A. photosynthesis B. endosymbiosis C. conjugation D. bina

ry fission
Biology
1 answer:
natita [175]2 years ago
5 0

Answer:

Answer B. Endosymbiosis

Explanation:

Early protists were first eukaryotic organisms and had several membrane bound organelles. The anaerobic protists evolved by acquiring purple bacteria. The purple bacteria have the ability to carry out aerobic cellular respiration. The endosymbiont transformed into mitochondria in due course of evolution. Similarly, the photosynthesizing protists were evolved by endosymbiosis of cyanobacteria which in turn was transformed into chloroplast during further evolution.

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dna

Explanation:

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3 years ago
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Describe how the complete oxidation of 1 mole of glucose can generate 32 ATPs. You should include i) products of anaerobic glyco
inn [45]

Answer:

Explanation:

1.During glycolysis,four molecules of ATP are formed,and two are expended to cause the initial phosphorylation of glucose to get the process going.This gives a net gain of two molecules of ATP

For every glucose molecule that undergoes cellular respiration, the citric acid cycle is carried out twice; this is because glycolysis (the first stage of aerobic respiration) produces two pyruvate molecules per glucose molecule. During pyruvate oxidation (the second stage of aerobic respiration), each pyruvate molecule is converted into one molecule of acetyl-CoA—the input into the citric acid cycle. Therefore, for every glucose molecule, two acetyl-CoA molecules are produced. Each of the two acetyl-CoA molecules goes once through the citric acid cycle.

The citric acid cycle begins with the fusion of acetyl-CoA and oxaloacetate to form citric acid. For each acetyl-CoA molecule, the products of the citric acid cycle are two carbon dioxide molecules, three NADH molecules, one FADH2 molecule, and one GTP/ATP molecule. Therefore, for every glucose molecule (which generates two acetyl-CoA molecules), the citric acid cycle yields four carbon dioxide molecules, six NADH molecules, two FADH2 molecules, and two GTP/ATP molecules. The citric acid cycle also regenerates oxaloacetate, the molecule that starts the cycle.

While the ATP yield of the citric acid cycle is modest, the generation of coenzymes NADH and FADH2 is critical for ATP production in the final stage of cellular respiration, oxidative phosphorylation. These coenzymes act as electron carriers and donate their electrons to the electron transport chain, ultimately driving the production of most of the ATP produced by cellular respiration.

3 0
3 years ago
Which statements about the circulatory system of a mollusk are true?
goldenfox [79]
<h3><u>Answer;</u></h3>

A. Gas exchanges takes place by diffusion.

B. It is an open system.

<h3><u>Explanation</u>;</h3>
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  • Open circulatory systems pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells.
  • Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood.
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2 years ago
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Secara umum, gaya mengacu pada tampilan atau desain keseluruhan dari suatu objek, atau metode menyelesaikan tugas...hope it helps

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Which organisms would normally be the least numerous in this community?
grandymaker [24]
B. Krill
I hope this will help you that is the correct answer
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