Which hormone affects the greatest variety of cell types?
A) parathyroid hormone
B) melatonin
C) growth hormone
D) calcitonin
Answer: C
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An energy pyramid shows the ____
a. amount of organic material in the bodies of organisms at each trophic level b. amount of energy that flows through each trophic level c. biomass amount at each trophic level d. amount of energy in an ecosystem, quantified by the base of the pyramid only e. trophic levels that exist in a specific ecosystem
Which structure gives rise to structures of face, neck and mouth?
a. primitive streak b. neural tube c. notochord d. pharyngeal arches
e. somitesWhy is it believed that RNA was the first informational molecule to evolve?
a. RNA molecules can replicate into DNA molecules. b. RNA molecules are more central to modern inheritance than DNA. c. RNA molecules degrade more slowly in solution than DNA molecules. d. RNA molecules are much simpler structures than other macromolecules. e. RNA molecules are able to function as both enzymes and substrates for their own replication.
Which of the following types of ion movement might be expected to require co-transport of protons from the mitochondrial intermembrane space to the matrix, inasmuch as it could not be driven by the membrane potential across the inner membrane? (
Assume that each ion being moved is moving against its concentration gradient.) (a) import of Ca2+ into the matrix from the intermembrane space (b) import of acetate ions into the matrix from the intermembrane space (c) exchange of Fe2+ in the matrix for Fe3+ in the intermembrane space (d) exchange of ATP from the matrix for ADP in the intermembrane space