Which of the following is true about the enzyme telomerase?
a. It can re-establish telomere length.
b. It is found only in adult cells.
c. It is responsible for telomere shortening.
d. It may speed up the aging process.
e. It is expressed at low levels in cancer cells.
ANSWER: a
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Reactions that reach an equilibrium point are reversible
Indicate whether the statement is true or false.
Which of the following is not a response to low temperature that increases the chance for survival?
a. hypothermia b. shivering c. production of brown fat d. vasoconstriction e. increased metabolism
The obvious advantage of the lac operon is that it ________________________.
A. allows bacteria to survive in the presence of lactose B. eliminates the need for lactose-metabolizing enzymes when lactose is not present C. enables bacteria to make lactose only in the presence of the proper enzymes D. negates the need for milk in the diet of adult humans E. enables glucose to substitute for lactose in the diet of lactose intolerant persons
Adenoviruses are a frequent cause of acute upper respiratory tract infections in humans. Adenoviruses are nonenveloped and their capsid contains a "fiber" protein that is analogous in function to the spike glycoproteins of HIV. Which of the following would be ACCURATE about an adenovirus that has a mutation in its fiber protein gene?
A. The virus would still cause upper respiratory tract infections in humans but at a slower rate. B. It would be able to infect humans normally, but would not be able to release new adenoviruses from the human cells. C. Because it has a defective fiber protein, it will now have a broader host range. D. It would not be able to cause disease in humans. E. It would be able to infect humans normally, but would not be able to replicate its genome.