What is the maximum number of electrons in a shell?
a. 0
b. 2
c. 6
d. 8
e. 12
ANSWER: d
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What is one potential fate for a proton in the mitochondrial matrix?
a. They are attached to NAD+ and FAD. b. They combine with oxygen to form water. c. They synthesize ATP by substrate-level phosphorylation. d. They help in the production of CO2. e. They regenerate Coenzyme A.
Which tissue type attaches to bones and is
responsible for producing body movements?
a. skeletal muscle b. neural c. epithelial d. smooth muscle e. connective
The length of a butterfly tongue perfectly matches the nectar tube of a flower it pollinates. This is an example of
A) competition. B) amensalism. C) phenotypic plasticity. D) coevolution.
What is the name of the main embryonic cell layer from which the nervous system is derived in most metazoans?
a. endoderm b. mesoglea c. mesoderm d. ectoderm