On average, what is the human respiratory rate?
a. 30-40 breaths per minute
b. 2-5 breaths per minute
c. 12-15 breaths per minute
d. 60-65 breaths per minute
c. 12-15 breaths per minute
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Why do positively charged amino acids appear more often than usual in histone proteins?
A. Because histones have a higher molecular mass, which improves DNA compaction B. Because histones are strongly attracted to the positively charged phosphate backbone of DNA C. Because histones and DNA have opposite charges, which improves the compaction of DNA into nucleosomes D. Because histones and DNA have the same charge, which improves the compaction of DNA into nucleosomes
A transport protein is analogous to a
a. wall partition. b. subway train. c. light switch. d. voice identification device. e. television receiver
Cleavage produces the
a. zygote. b. blastula. c. gastrula. d. puff. e. third germ layer.