An SNP always occurs due to
A) a one base-pair change.
B) a three base-pair change.
C) a single restriction site change.
D) a single amino acid change.
E) None of these
A
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When dendritic cells ingest antigen, they migrate to the ________, where they present the antigen to T lymphocytes
A) kidneys B) lymph nodes C) thymus D) spleen
Which of the following statements is true of the alternation of generations in pine trees?
A. There are two types of cones: gametophyte cones and sporophyte cones. B. There are two types of cones: ovule cones and pollen cones. C. Pollination is immediately followed by fertilization. D. The spore in a pollen grain divides through meiosis to produce sperm. E. The eggs produced in female cones become the seed.
The leading reason for liver transplantation in the United States is ________.
A. hepatitis D B. hepatitis C C. hepatitis A D. hepatitis B
Which scenario describes allopatric speciation?
A) A population of squirrels is separated by the Grand Canyon. The two subpopulations evolve into two distinct species. B) A tetraploid plant species evolves from a diploid ancestor. Both the tetraploid and diploid species are found in the same habitat. C) One population breeds in the fall; another population breeds in the spring. D) A male horse and a female donkey mate, producing a sterile hinny.