Which is NOT part of the nitrogen cycle?
a. denitrification
b. deammonification
c. nitrogen fixation
d. ammonification
e. uptake by autotrophs
ANSWER: b
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Hemocyanin:a
combines irreversibly with oxygen for transport within the body of various organisms. b. is bright red in color when combined with oxygen. c. has an iron-porphyrin group that is responsible for oxygen transport. d. is a respiratory pigment found in the blood of some invertebrate and vertebrate species. e. is a respiratory pigment that is colorless when deoxygenated.
Protein phosphorylation, protein folding, and proteolytic cleavage are all examples of
A) post-transcriptional control of gene expression and activity. B) epigenetic control of inheritance. C) repression of gene expression. D) induction of gene expression. E) post-translational control of gene expression and activity.
How many hydrogen bonds are present between cytosine and guanine (C and G)?
A) 1 B) 2 C) 3 D) 4
According to the law of segregation, in an organism with the genotype Aa
A) one-quarter of the gametes get the A allele and three-quarters get the a allele. B) three-quarters of the gametes get the A allele and one-quarter get the a allele. C) all of the gametes get the A allele. D) one-half of the gametes get the A allele and one-half get the a allele. E) all of the gametes get the a allele.