Conversion of Vitamin D by the kidneys to an active form is an example of the urinary system's
homeostatic interaction with which system?
a. skeletal
b. cardiovascular
c. digestive
d. endocrine
e. muscular
C
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What are the three tissue systems of plants contained in each plant organ, such as leaves?
A. Dermal, ground, and vascular tissue systems B. Dermal, cell wall, and vascular tissue systems C. Ground, germ, and vascular tissue systems D. Ground, mesophyll, and vascular tissue systems
Phycobilins are
a. photosynthetic pigments. b. found in the red algae. c. blue and red pigments. d. all of the above.
In his analysis of rII in phage, Benzer assayed complementation
Suppose you try your hand at this with several mutants and get the following results (+ = complementation): 42 and 62 + 42 and 83 – 62 and 63 – 62 and 74 + 42 and 74 – 42 and 75 + 62 and 75 – Mutation 42 has previously been shown to be in a different gene than mutation 62. What can you conclude? A) Mutations 42 and 75 are in the same gene. B) Mutations 62 and 74 are in the same gene. C) Mutations 62, 63, and 74 are in the same gene. D) Mutations 42 and 74 are in the same gene. E) Mutation 63 is not in the same gene as either 62 or 42.
What explains the coloration of giant kelp?
A. It is the result of waste products stored in the tissues. B. It warns grazers of their toxic properties. C. It facilitates absorption of the blue-green light prevalent in their environment. D. It facilitates absorption of the brown light prevalent in their environment. E. It camouflages them from grazers.