Perpetually young tissues where cells retain the
ability to divide are
a. vascular.
b. meristematic.
c. protective.
d. photosynthetic.
e. all of these
B
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A substrate-level phosphorylation occurs in the citric acid cycle when _____
A) GDP is phosphorylated to produce GTP B) NAD+ is phosphorylated to NADH C) oxaloacetate is phosphorylated D) acetylation of oxaloacetate takes place
If a man expresses an X-linked recessive trait, ____
a. all of his brothers will also express it b. his father transmitted the trait to him c. his father carried the trait d. all of his sisters will also express it e. his mother was heterozygous or homozygous for the trait
A growth curve plots the (concentration/number/percentage) of viable organisms in a growing population over time.
Fill in the blank(s) with the appropriate word(s).
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 FSH and LH maintains the corpus luteum, keeping estradiol and progesterone high until the placenta takes over secretion of these hormones. B. 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. C. The embryo's secretion of GnRH maintains the corpus luteum, keeping FSH and LH high until the placenta takes over secretion of these hormones. D. The embryo's secretion of hCG maintains the corpus luteum, keeping estradiol and progesterone high until the placenta takes over secretion of these hormones.