Which of the following is not a characteristic of an X-linked recessive disorder pedigree?
A. If a woman has the characteristic, all of her sons will have it.
B. If a female has the trait, her father must also have it.
C. An affected son can have normal parents.
D. More females than males are affected.
E. The characteristic often skips a generation.
Answer: D
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The event that occurs when allolactose levels increase in E. coli is
A. transcription of genes within the lac operon increases. B. transcription of genes within the lac operon decreases. C. transcription of genes within the lac operon does not change. D. E. coli cells replicate rapidly. E. the tryptophan operon becomes more active.
Stomata open when K+ concentration in guard cells ____, followed by water ____ the guard cells by osmosis
a. increases; entering b. decreases; entering c. decreases; leaving d. increases; leaving e. increases H+; leaving
The ____ carries sperm away from the epididymis
a. vas deferens b. urethra
c. seminal vesicle d. ejaculatory duct e. prostate
Which type of virus is most likely to cause the immediate damage and destruction of an infected animal cell when it is released?
A) Enveloped virus B) RNA virus C) DNA virus D) Nonenveloped virus