Nondisjunction involving the X chromosomes may
occur during oogenesis and produce two kinds of
eggs. If normal sperm fertilize these two types,
which of the following pairs of genotypes are
possible?
a. XX and XY
b. XXY and XO
c. XYY and XO
d. XYY and YO
e. none of these
Answer: b
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DNA probes are used to:
A. determine the nucleotide sequences of DNA samples. B. perform PCR on small samples of DNA. C. cut large segments of DNA into smaller fragments for analysis. D. determine whether a particular DNA sequence is present in a sample. E. determine the degree of similarity between two DNA samples.
If the concentration of a ligand is 100 times greater than the Kd of its receptor, _______ of the receptors will be bound to a ligand.
A. few B. none C. most D. half
Organ transplant patients often develop cancers at rates higher than normal. This observation supports the idea that cancer formation is dependent on
A) anchorage-independence of growth. B) evasion of immune surveillance. C) multistep mutations. D) angiogenesis. E) increased motility of cancer cells.
Blood is moved efficiently through the veins and back to the heart by ____.
A. one-way valves to prevent backflow B. smooth muscle contraction C. skeletal muscle contraction D. a and b only E. a, b, and c