In automated DNA sequencing, eventually there will
be millions of DNA fragments all tagged at
a. one end.
b. both ends.
c. every nucleotide.
d. the most numerous nucleotide.
e. the least numerous nucleotide.
Answer: a
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A type of adhesive junction that is associated with the connection between an epithelial cell and the basal lamella is the
A) hemidesmosome. B) desmosome. C) gap junction. D) plasmodesmata. E) focal contact.
When a neuron undergoes a change in membrane potential that is proportional to (i.e., varies depending on) the strength of the stimulus given to that neuron, this is referred to as a/an
A. equilibrium potential. B. action potential. C. resting potential. D. reversal potential. E. graded potential.
Studies have shown that _____ interfere(s) with proper thyroid function
a. iodine b. nitrites c. phosphates d. calcium e. nitrates
An extremely rare occurrence in humans is a multiple pregnancy with the embryos at different stages due to fertilization weeks apart. What mechanism normally prevents this from happening?
A. The embryo's secretion of hCG maintains the corpus luteum, keeping estradiol and progesterone high until the placenta takes over secretion of these hormones. B. The embryo's secretion of FSH and LH maintains the corpus luteum, keeping estradiol and progesterone high until the placenta takes over secretion of these hormones. C. The follicle's secretion of polar bodies maintains the fimbriae, keeping estradiol and progesterone high until the fallopian tube takes over secretion of these hormones. D. The embryo's secretion of GnRH maintains the corpus luteum, keeping FSH and LH high until the placenta takes over secretion of these hormones.