Comparisons of human and mouse genomes reveals
A. they have very little in common.
B. the genomes are very similar, with most of the genes unique to mice linked to smell and reproduction.
C. they have widely different numbers of genes, and share only a few more genes than humans and pufferfish.
D. the differences between humans and mice are mainly the introns.
E. the genomes are very similar, with most of the genes unique to mice linked to size and shape.
Answer: B
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Which one of the following statements about gene regulation is incorrect?
A. Gene regulation occurs at the level of the chromosome. B. Gene regulation occurs at the level of transcription. C. Gene regulation occurs only in prokaryotes. D. Gene regulation occurs at the translational level. E. Gene regulation occurs at the posttranslational level.
The carbon dioxide that we breathe out is a breakdown product of cellular respiration; the
carbon atoms come primarily from which molecules?
a. glucose b. proteins c. oxygen d. water
Long-term exposure to cold can alter metabolism and encourage __________ in which brown adipose
tissue produces heat. Fill in the blank(s) with the appropriate word(s).
The level of carbon dioxide in the blood is monitored by nerve tissue. If you exercise strenuously, the increase in cellular respiration consumes oxygen from the blood and produces surplus carbon dioxide removed in the blood. Since this physical exertion requires faster breathing to replenish oxygen supplies and carry away carbon dioxide, the carbon dioxide sensors result in signals from the brain to increase breathing rate. After you have rested, and carbon dioxide levels are back to normal, your breathing rate decreases too. This is an example of
A. a positive feedback loop that stimulates a response opposite to the stimulus. B. a response to a sensory impulse that causes a muscle or gland to react. C. the dynamic interplay between events that tend to change the internal environment and events that tend to keep it the same. D. a negative feedback loop that stimulates a response similar to the stimulus. E. the dynamic interplay between events that tend to change the internal environment and events that tend to increase the changes.