Question

11. Eukaryotic cells are most likely to have originated when a. climate changes disturbed natural processes b. a supernatural force intervened c. a comet seeded the earth with the new cells d. one (or more) prokaryotic cell(s) took up residence in another 12. Evidence in support of the endosymbiont hypothesis is a. the remarkable similarity between some organelles and modern prokaryotic cells (size, shape, behavior, reproduction, ribosomes, DNA) b. we see this happening occasionally today c. prokaryotic cells were first on earth d. all of the above 13. The cells of an ant and a horse are, on average, the same small size; a horse just has more of them. What is the main advantage of small cell size? a. small cells are less likely to burst than large cells b. a small cell has a smaller plasma membrane surface area than a large cell c. small cells can better take up sufficient nutrients and oxygen d. it takes less energy to make a small cell e. small cells require less oxygen 14. Which of the following clues would tell you whether a cell is prokaryotic or eukaryotic? a. the presence or absence of a rigid cell wall b. whether or not the cell is partitioned by internal membranes c. the presence or absence of ribosomes d. whether or not the cell carries out cellular metabolism e. whether or not the cell contains DNA

Answer 1

11. D)

this is referred to as the endosymbiotic theory. The endosymbiotic theory has been responsible in explaining how eukaryotes have evolved. Climate changes have not been shown to be affecting the formation of eukaryotic cells. Neither have supernatural sources been seen to be responsible in formation of eukaryotic cells.

12. A)

Ther have been similarities seen between a number of organelles, for example chloroplasts as well as mitochondrial cells. The DNA in these organelles is their own and is different from nucleus DNA. Hence, this is the correct option.

13. C)

small cells are seen to be having smaller smaller volume to surface area ratio, which would be making sure that that appropriate amount of materials would be crossing the plasma membrane.

14. B)

the prokaryotes are not known to be having internal compartments that would be enclosing the membranes. The membrane enclosed compartments are only present in the eukaryotes.