It has been proposed that the first living organisms were:
a. heterotrophs.
b. autotrophs.
c. chemosynthetic.
d. photosynthetic.
e. multicellular.
A
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Historical extinction rates are best known for
A. reptiles and amphibians. B. reptiles and birds. C. amphibians and fish. D. amphibians and birds. E. birds and mammals.
A researcher is looking at different petri dishes containing the yeast C. albicans. In the first dish she evaluates, she notices that the yeast does not form hyphae. Is this a mutant strain of yeast?
A. Yes, as the lack of hyphae denotes pathogenic yeast. B. Yes, as yeast typically forms hyphae. C. No, as yeast does not normally form hyphae. D. No, as yeast always forms rhizoids and not hyphae.
If alternative splicing did NOT occur then _____
A) the human genome would likely contain many more genes B) the E. coli genome would contain many fewer genes C) there would be little correlation between the complexity of organisms and genome size D) there would be many fewer genes devoted to metabolism in Arabidopsis and yeast
Of which materials is cartilage composed?
A. collagen fibers and osteocytes B. osteocytes and glycoproteins C. glycoproteins and calcium phosphate D. osteocytes and calcium phosphate E. glycoproteins and collagen fibers