Which cellular response follows activation of a ligand-gated ion channel?
a. direct regulation of gene expression
b. generation of an electrical signal
c. activation of a phosphorylation cascade
d. activation of a second messenger pathway
e. direct activation of a kinase
ANSWER: b
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Which of the following statements is false?
A. An excess intake of food results in a shift in metabolism to mostly catabolic processes. B. For an animal in energy balance, the amount of calories obtained from food is equal to the amount of calories used to meet its metabolic needs. C. Animals in a negative energy balance will begin to deplete their glycogen and fat reserves. D. A net positive energy intake results in the growth of fat stores. E. None of these statements is false.
All of the following are general characteristics of all animals except
a. diploid with haploid eggs and sperm. b. develop from an embryo. c. multicellular body. d. heterotrophic. e. possesion of nerves and muscles.
What controls whether an embryo will develop testes or ovaries?:
a. pituitary gland b. hypothalamus c. Y chromosome d. presence or absence of estrogen
The most immediate effect of sexual displays and contests in animals (such as bighorn sheep bashing their heads together) is:
A) differential mating success. B) mutations. C) disruptive selection. D) stabilizing selection.