Sperm are produced in the
a. testes.
b. vas deferens.
c. epididymis.
d. prostate gland.
e. penis.
A
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Thigmotropism is a growth response to
a. light. b. day length. c. contact with a solid object. d. circadian rhythms. e. gravity.
Widespread use of pesticides has lead to pesticide-resistant insects, just as overprescribing antibiotics has led to antibiotic-resistant bacteria. These are both examples of ________ at work.
Fill in the blank(s) with the appropriate word(s).
What most likely explains the recovery of live S strain cells from a mouse injected with heat-killed S strain mixed with live R strain cells?
a. The S strain was revived by the presence of the host's immune system. b. The R strain picked up the S strain DNA, enabling it to produce a capsule. c. The R strain cells picked up the capsules from the S strain cells. d. The S strain fused with the R strain, making it resistant.
Which of the following is not a source of genetic variation in bacterial populations?
a. Transduction b. Transformation c. Conjugation d. Mutation e. Meiosis