The nucleotides within DNA are composed of a
A. phosphate group, ribose sugar, and nitrogenous base.
B. sulfur group, ribose sugar, and nitrogenous base.
C. phosphate group, deoxyribose sugar, and nitrogenous base.
D. sulfur group, deoxyribose sugar, and nitrogenous base.
E. phosphate group, hexose sugar, and nitrogenous base.
C. phosphate group, deoxyribose sugar, and nitrogenous base.
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How many copies of each gene are present in these skin cells at G1 of interphase?
A. 2 B. 4 C. 6 D. 8
The codons UCU, UCC, UCA, and UCG all code for the same amino acid, serine. In which position of the codon are mutations most likely to be found when comparing the same gene of two closely related species?
A. position 1 B. position 2 C. position 3 D. none of the positions; any change will be lethal.
In response to the presence of extracellular antigen, B cells rapidly proliferate and the immunoglobulin M (IgM) proteins produced are soluble rather than anchored in the membrane.This change in IgM protein state is due to:
A. the cleavage of several hydrophobic amino acid residues from the IgM protein. B. the differential expression of two different IgM genes. C. the predominant use of the first 3' end cleavage site of the IgM pre-mRNA. D. inclusion of the M exon in mature IgM mRNA.
In the absence of competition from other males:
a. Female chickens mated more often with the male present. b. The quantity of sperm a male used to inseminate a female decreased. c. Once a male has inseminated a female, additional sperm may do little to increase the probabil-ity of fertilization. d. Both B and C