Graft rejection can be reduced by
A) preventing B cell activation.
B) antiphagocytic factors.
C) antihistimines.
D) preventing T cell proliferation.
E) epinephrine.
D
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Why are mutations uncommon in normal cells?
a. Only 25% of the genome codes for proteins, therefore the probability is low that a mutation would occur in a protein coding region. b. Most mutations occur after DNA replication. c. Many amino acids are coded for by more than one codon. d. The mutation rate during DNA replication is 1 in 100 nucleotides. e. The mutation rate during DNA replication is zero.
The rate at which mRNA is processed by
ribosomes is an example of a. transcriptional control. b. transcript processing control. c. transport control. d. translational control. e. post-translational control.
Which of the following is true of the basement
membrane? a. It overlies the epithelium at its free surface. b. It is composed partially of epithelial cells and partially of connective tissue. c. It is mostly lipid and embedded celluloid fibers. d. It lies between the epithelium and connective tissue. e. It cements the layers of stratified epithelium together.
The percentage of twins being born has increased in the past 20 years because of:
a. the increased use of fertility inducing drugs. b. increases in hospital care. c. the desire of more couples to have twins. d. the increased use of thalidomide. e. the increased incidence of German measles.