In humans, telomerase ____
a. adds telomere repeats in some human cells
b. removes telomere repeats in all human cells
c. adds telomere repeats in all human cells
d. removes telomere repeats in some human cells
e. transcribes telomere repeats in some human cells
ANSWER: a
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________ mutations occur in the promoter or operator region of a gene or set of genes and affects the expression of the downstream genes without affecting the amino acid sequences of the gene products.
Fill in the blank(s) with the appropriate word(s).
Which of the following types of contraception is the least effective?
A. RU486 B. the rhythm method C. condoms D. birth control pills E. All of these contraceptive methods are equally effective
A cell that has neither a net gain of water nor a net loss of water when it is immersed in a solution must be
A) isotonic to its environment. B) hypertonic to its environment. C) hypotonic to its environment.
During ________, viruses remain dormant in animal cells
A) budding B) latency C) lytic replication D) persistent infection E) oncogenesis