The grainy-looking substance inside the nucleus is composed of
A. DNA and proteins.
B. phospholipids.
C. mitochondria.
D. ribosomes.
E. nucleoplasm.
Answer: A
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In the kidney, the specialized transport proteins that allow for very rapid fluid movement into or out of cells are known as
A) aquaporins. B) porins. C) ionophores. D) anion exchange proteins. E) osmosins.
Any blastomere removed from an eight-cell mammalian embryo can develop into a normal late-stage embryo. This finding supports the idea that
A) only the zygote is totipotent. B) the progressive restriction of potency hypothesis applies. C) the first cleavage event must be transverse to the animal-vegetal axis of the zygote. D) cell divisions producing the earliest blastomeres do not result in an asymmetrical distribution of cytoplasmic determinants. E) there is no organizer in mammals.
Tightly curled or wooly hair is caused by a dominant gene in humans. If a heterozygous curly-haired person marries a person with straight hair, what percentage of their offspring would be expected to have straight hair?
A) 75% curly B) 50% straight C) 25% curly D) 100% straight E) It is impossible to predict the outcome.
Lipids are the only class of macromolecules that contain
A. nucleotides. B. monosaccharides. C. amino acids. D. fatty acids. E. phosphate groups.