All of the following animals have, or are descended from, animals with a post-anal tails except:
A. Dogs
B. Frogs
C. Sharks
D. Humans
E. All of the above are correct
Answer: E. All of the above are correct
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What type of bond forms when two elements equally share their electrons?
a. Polar b. Hydrogen c. Nonpolar d. Ionic e. None of these choices.
Mutation of the B group gene in Arabidopsis
thaliana affects development in its flower’s a. first whorl only. b. second whorl only. c. third whorl only. d. first and second whorls. e. second and third whorls.
The constant region of an antibody
A) has no function. B) recognizes and binds to the antigen. C) stimulates the production of macrophages and T-cells. D) determines where the antibody is located and its role in the immune response.
You observe a houseplant on your window sill bending toward the bright afternoon sunlight. Being knowledgeable, you wish to explain the molecular events of the phototropic response to your friend. What is the correct sequence that you would describe?
I. PHOT1 attains a phosphate group, and changes shape II. cell elongation occurs on the shady side of the plant III. auxin binds its receptor at target tissues IV. light strikes PHOT1 V. PHOT1 stimulates downward auxin transport on the shady side of the plant VI. light strikes stomates, which close, minimizing water loss VII.cells on the illuminated side of the plant become shorter A) VI, VII, II B) VII, II, III, I C) IV, I, V, III, II D) IV, VI, III, VII E) any of these sequences can initiate phototropism