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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology