Adaptive mechanisms, such as ____, can help animals live at a high elevation
a. carbonic acid
b. a large heart
c. hemoglobin with more heme groups
d. decreased nitric oxide
e. small efficient lungs
ANSWER: b
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J. H. Connell proposed that competition occurred between barnacle species; he based that on:
a. the observed distribution of the species and environmental measurements. b. laboratory test he had concluded. c. a conversation with other scientists. d. the observation that they were in the rocky intertidal. e. laboratory observations of their fighting behavior.
Which of the following is considered a peptide hormone?
a. estrogen b. epinephrine c. thyroxine d. insulin
In order for a muscle contraction to occur, cross-bridges must form between which one of the following structures within a muscle cell?
A) the plasma membrane and the sarcoplasmic reticulum B) troponin and tropomyosin C) calcium and tropomyosin D) acetylcholine and muscle cell receptors E) actin and myosin
Much of the work of breaking down the food we ingest is done by our
(a) stomach (b) teeth (c) gut microbiome (d) esophagus