Nondisjunction can lead to two forms of aneuploidy. What are they, and how do they occur?
What will be an ideal response?
The two most common aneuploid conditions are N + 1 and N - 1 (one extra and one missing chromosome, respectively). The N + 1 condition arises when two chromatids of a given chromosome fail to separate during meiosis, giving the resulting gamete an additional copy of that chromosome. Likewise, the N - 1 condition is found in the gamete missing a chromatid that stayed paired with its sister.
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Which ion channel is responsible for the rising phase of the action potential, and why?
What will be an ideal response?
Which of the following statements best describes the end result of bacterial conjugation?
a. The two cells have had an equal exchange of plasmids. b. One cell has lost a plasmid, while the other cell has gained one. c. One cell has lost a chromosome, while the other has gained one. d. One cell has given a copy of a plasmid to another cell and kept one copy for itself.
Cholesterol transported by HDL is metabolized in what organ
What will be an ideal response?
The sodium-potassium pump is primarily responsible for
A. maintaining isotonic water balance. B. the excretion of salts. C. the contraction of muscle fibers. D. the resting potential. E. the action potential.