Cells can be large if they
A. are metabolically very active.
B. have metabolically inactive central regions.
C. actively pump nutrients into the cell.
D. have a very small surface area compared to their volume.
B. have metabolically inactive central regions.
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Choanoflagellates are single-celled eukaryotes that feed on bacteria. The presence of their food bacteria causes these cells to cluster into multicellular structures in which the individual choanoflagellate cells are attached to one another
Based on this observation, it may be assumed that: A. the bacterial cells, or a chemical released by the bacteria, bind to a receptor on the plasma membrane of the choanoflagellate cells. B. the choanoflagellate cells use cadherins to attach to each other. C. the choanoflagellates use integrins to attach to each other. D. choanoflagellates are complex multicellular organisms because they alternate between single cell and multicellular states.
Natural selection is only one of several possible causes of evolution
Indicate whether the statement is true or false
In a plant, the reactions that produce molecular oxygen (O2 ) take place in _____
A) the light reactions alone B) the Calvin cycle alone C) the light reactions and the Calvin cycle D) neither the light reactions nor the Calvin cycle
Protists typically only reproduce sexually during
A. warm conditions. B. darkness. C. low pH conditions. D. stress. E. cold conditions.