What are believed to be the evolutionary ancestors of mitochondria?
a. ancient Archaea
b. ancient proteobacteria
c. ancient green bacteria
d. ancient cyanobacteria
Ans: b. ancient proteobacteria
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Meissner's corpuscles and Pacinian corpuscles detect ________
a. touch and pressure b. heat c. cold d. continuous sensations after other receptors have adapted
When male moose engage in their annual battles, butting heads with their oversized antlers, they are
participating in a process that will lead to
a. stabilizing selection. b. disruptive selection. c. directional selection. d. intrasexual selection. e. intersexual selection.
The finding that mutations in synapse genes are associated with many genetic disorders that have a behavioral
component suggests that _____. a. individuals with these mutations lack synapses b. individuals with these mutations lack neurotransmitters c. malfunctions in presynaptic neurons cause abnormal behavior d. malfunctioning synapses are associated with abnormal behavior e. behavior disorders are attributable to environmental factors
In humans, the spine is made up of ________ vertebrae, and there are ________ pairs of ribs.
A. 25; 12 B. 20; 15 C. 26; 12 D. 16; 16 E. 27; 14