Bile
a. has no effect on digestion.
b. helps in the digestion of fats.
c. helps in the digestion of carbohydrates.
d. helps in the digestion of proteins.
e. helps in the digestion of nucleic acids
B
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The higher order structure of chromatin contains topologically constrained loops. What would happen if a single loop was cleaved?
A. The entire chromosome would unravel. B. The genes of that loop could not be transcribed. C. Only that loop would relax because each loop is separately constrained by proteins. D. The genes in the cleaved loop could not be replicated. E. Supercoiling in the cleaved loop would not be affected.
Concerning the role of the pancreas in digestion,
a. no digestion occurs in the pancreas. b. endocrine cells secrete bicarbonate, which helps neutralize highly acidic chyme. c. endocrine cells release enzymes that break down carbohydrates, fats, proteins, and nucleic acids in the small intestine. d. exocrine tissue produces insulin and glucagon, which help regulate the metabolism of sugar. e. all of these are true.
Sickle-cell disease is caused by a single mutation in the DNA of a particular gene. A person with this disease has red blood cells that lose their original donut shape and form a sickle shape. People with this disorder suffer from low energy levels, blood clots, and strokes. This is an example of
a. a multifactorial trait. b. polygenic inheritance. c. pleiotropy. d. codominance
Crossing over usually contributes to genetic variation by exchanging chromosomal segments between
A) sister chromatids of a chromosome. B) chromatids of nonhomologues. C) nonsister chromatids of homologues. D) nonhomologous loci of the genome. E) autosomes and sex chromosome