What is the purpose of the last stage of the citric acid cycle?
a. to replenish the supplies of NAD+ and FAD
b. to break down glucose into a three-carbon molecule
c. to regenerate oxaloacetate to attach to another acetyl molecule
d. to produce ATP by substrate-level phosphorylation
Ans: c. to regenerate oxaloacetate to attach to another acetyl molecule
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Which group of Insects makes up approximately 10% of the animal biomass on Earth?
a. Flies b. Butterflies c. Bees d. Beetles e. Ants
Cells that detect internal and external conditions are
A. sensors. B. motivators. C. effectors. D. collaborators. E. axons.
The theory that individuals with certain traits are more fit for their local environment and therefore are more likely to survive and reproduce is known as
A) natural selection. B) macroevolution. C) gene flow. D) antigenic drift. E) the bottleneck effect.
The __________ insulates and protect the axon for some neurons:
a. axon terminal b. myelin sheath c. cell body d. nucleus