Comparison of the mouse and human genomes show that overall about 5% of nucleotides have evidence of selection acting on them, as compared to 1% of sites within exons. This suggests that
a. the mouse genome evolves more quickly than the human genome.
b. most changes in exons are eliminated.
c. the mouse genome is more subject to neutral evolution than the human genome.
d. the mouse genome evolves more slowly than the human genome.
e. many sequences that do not encode polypeptide are functionally important.
Ans: e
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Which of the following statements about double fertilization in angiosperms is correct?
A) One pollen grain combines with the egg to form the zygote, and one pollen grain combines with the polar nuclei to form endosperm. Two sperm combine with a polar nucleus to form endosperm. B) Two pollen grains combine with two ovules to form the zygote and endosperm. C) One sperm combines with the polar nuclei to form the zygote, and one sperm combines with the egg to form endosperm. D) One sperm combines with the egg to form the zygote, and one sperm combines with the polar nuclei to form endosperm.
The different strains of a bacterial species
A. may be susceptible to different antibiotics. B. reproduce asexually. C. may be the result of random mutations. D. can participate in conjugation and transformation. E. are described accurately by all of these statements.
During which months, in northern temperate zones, do plants begin the onset of dormancy?
a. April - June b. March - July c. February - April d. December - January e. September - October
________ are found halfway between the equator and poles, cover the interiors of major continents, and have been largely converted to agricultural use.
A. Savannas B. Temperate rain forests C. Grasslands D. Taigas