When does homologous recombination most likely occur in order to flawlessly repair double-stranded DNA breaks?
A. when the damage is overlooked by the fast-acting mismatch repair system
B. before DNA is replicated, to avoid propagating the error
C. whenever a double-strand break is detected
D. after the cell's DNA has been replicated
E. after the broken ends have been "cleaned" by a nuclease
Ans: D. after the cell's DNA has been replicated
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Why are adhering junctions common in tissues subject to constant abrasion or stretching, such as skin?
a. These cells need to communicate by allowing cytoplasm to flow between adjacent cells. b. The cells in these tissues require strong cell-to-cell junctions to hold them together. c. Adhering junctions prevent harsh enzymes from flowing between adjacent cells.
d. These tissues do not have basement membranes. e. Adhering junctions allow production of a protective cuticle.
The ovaries of women function as endocrine organs by producing
A) estrogen and progesterone. B) oxytocin. C) growth hormone. D) ADH. E) prostaglandins.
Describe a somewhat extraordinary finding related to the Tetrahymena telomerase enzyme
What will be an ideal response?
Advantages of the interferon-gamma release assay (IGRA) over the traditional TB skin test include all of the following except
A) IGRAs are sensitive enough to detect early cases of TB. B) IGRA can provide results within a day. C) IGRA requires only one patient visit as opposed to two with the skin test. D) IGRA only detects active TB infections. E) IGRA can be used on persons who have been vaccinated against TB.