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ikadub [295]
3 years ago
7

Which of the following is NOT a distinguishing characteristic of prokaryotic cells? A) Their DNA is not enclosed within a membra

ne. B) They lack membrane-enclosed organelles. C) They have cell walls containing peptidoglycan. D) Their DNA is not associated with histones. E) They lack a plasma membrane.
Biology
1 answer:
Setler [38]3 years ago
4 0

Answer:

The answer is:

E. They lack a plasma membrane.

The reason is that the plasma membrane is actually a very important part of their cell. Hope that helps! :)

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To which substance does ferredoxin transfer an electron?
Sonbull [250]

The right answer is NADP+.

Ferredoxin is an iron-sulfur protein that effects electron transfer in a large number of redox reactions in cell metabolism through Fe-S clusters whose iron cations oscillate between +2 (ferrous) oxidation states. and +3 (ferric). The first protein of this type was isolated in 1962 from the anaerobic bacterium Clostridium pasteurianum. A chloroplast-specific ferredoxin is involved in the cyclic and noncyclic photophosphorylation reactions of photosynthesis. In non-cyclic photophosphorylation, ferredoxin is the ultimate electron acceptor and reduces NADP + under the action of ferredoxin-NADP + reductase (EC 1.18.1.2) with FAD and a flavin group as cofactors:

2 ferredoxin- [Fe (2+) Fe (3+) S2 (-2)] + NADP (+) + H (+) ==> 2 ferredoxin- [Fe3 (+2) S2 (-2)] + NADPH .

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3 years ago
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Students are studying the rate of yeast fermentation under different conditions. Glucose is a monosaccharide. Sucrose is a
Akimi4 [234]

Answer:

The correct option is B. Fermentation would occur at a similar rate to that of glucose.

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3 years ago
Organic molecules that end in the suffix "-ase" often function as ________ molecules.
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The given blank can be filled with enzymatic molecules.  

Enzymes refer to biological molecules or proteins, which function as catalysts and assist the composite reactions to take place everywhere in life. The enzymes generally end with the suffix - ase. For example, proteases, which functions to dissociate the peptide bonds between the amino acids.  

Enzymes are big molecules, which accelerate the rate of chemical reactions within the cells, and like all other kinds of proteins, they comprise lengthy chains of amino acids.  


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Because most waste produced in the cell is toxic when it accumulates.

Hope this helps!
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