Horizontal gene transfer is not thought to play a major role in the exchange of which of the following genes between bacterial species?
A. genes encoding rRNAs
B. genes conveying antibiotic resistance
C. genes involved in nitrogen fixation
D. genes involved in bacterial photosynthesis
A
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Crosses between a yellow rat with a yellow rat always produce yellow offspring. Crosses between a white rat with a
white rat always produce white offspring. The alleles affect the same aspect of coat color. The cross of a white rat with a yellow rat produces a cream rat. If you cross two cream rats, what will be the ratios of phenotypes of the offspring? What will be an ideal response?
Which of the following would NOT be part of the germ tube?
A. tube cell nucleus B. two sperm cells C. pollen sporopollenin wall D. pectin precursors E. cell membrane
A muscle that decreases the angle between two bones at a joint is called a(n)____
a. flexor b. agonist c. depressor d. antagonist e. extensor
A vein is a blood vessel that always carries
(a) blood toward the heart. (b) blood away from the heart. (c) oxygen-rich blood. (d) oxygen-poor blood.