Airways of the mammalian respiratory system function to ____
a. filter oxygen from carbon dioxide
b. moisten external air
c. cool external air
d. filter water out of the air
e. keep water out of the lungs
ANSWER: b
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The terms helical, icosahedral, and complex refer to
A. viral life cycles. B. forms of nucleic acid. C. types of viral envelopes. D. shapes of viruses.
Which phenotypes are parental?
In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes). Flies who are homozygous recessive at both pr and cn have orange eyes. A female who has wild-type eyes is crossed to an orange-eyed male. Their progeny have the following distribution of eye colors:
A) wild-type and orange
B) brown and bright-red
C) wild-type and brown
D) bright-red and orange
E) There is no way to determine this.
Maternal and paternal chromosomes are shuffled most during
a. anaphase II. b. metaphase I. c. prophase I. d. telophase II. e. interphase.
Typically, methylation of nucleosome N-terminal tails leads to __________
A) removal of the protein components of the chromatin from the DNA B) relaxed packaging of the chromatin and increased transcription C) tighter packaging of the chromatin and reduced transcription D) increased amounts of euchromatin relative to heterochromatin E) activation of topoisomerase