Current location - Health Preservation Learning Network - Health preserving class - The following statements about cells are correct: (a) single-celled autotrophs such as nitrifying bacteria and cyanobacteria all have the ability to utilize CO2; B) protein.
The following statements about cells are correct: (a) single-celled autotrophs such as nitrifying bacteria and cyanobacteria all have the ability to utilize CO2; B) protein.
A, nitrifying bacteria, cyanobacteria and other single-celled autotrophs can synthesize organic matter from carbon dioxide and water, and they all have the ability to utilize CO2. A is correct;

B, most enzymes are protein, which can play a role in vivo or in vitro as long as the conditions are suitable. B is wrong;

C in prokaryotes, there are no real nuclei and nucleoli. But only one organelle, ribosome, C is wrong;

D, when cells are aging, the volume of the nucleus becomes larger, the permeability of the cell membrane changes, and the material transport function is reduced. D is wrong.

So choose: a.

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