Choanoflagellates and sponge choanocyte cells bear a strong resemblance to each other. What would disprove the hypothesis that choanoflagellates and sponges are closely related?
a. large gaps in the fossil record
b. alternation of generations in sponges
c. significant differences in nuclear DNA
d. they’re different colors in this illustration
c. significant differences in nuclear DNA
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The Cnidarians possess:
a. a water vascular system. b. bi-lateral symmetry. c. stinging cells. d. spicules. e. setae.
Which of the following properties of RNA is most directly responsible for its ability to form complex shapes?
A) the presence of uracil instead of thymine B) the fact that RNA is primarily double-stranded C) the relative instability of RNA compared to DNA D) the fact that RNA is primarily single-stranded E) the substitution of deoxyribose in DNA with ribose in RNA
The greatest concentration of nitrogen on earth
is found in
a. living organisms, including bacteria. b. the atmosphere. c. soil minerals. d. fossil fuels. e. oceans.
Which of the following is the purpose of the functional photoreceptors in a blind mole rat?
a. They transmit light form the environment. b. They absorb light from the environment. c. They properly set the biological clock. d. They properly set the position of the animal.