Engulfing-phagocytic cells of innate immunity of vertebrates include _____
I) neutrophils
II) macrophages
III) dendritic cells
IV) natural killer cells
A) I and III
B) II and IV
C) I and IV
D) I, II, and III
E) I, II, III, and IV
Answer: D
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What is the role of DNA ligase in the elongation of the lagging strand during DNA replication?
A) It synthesizes RNA nucleotides to make a primer. B) It catalyzes the lengthening of telomeres. C) It joins Okazaki fragments together. D) It unwinds the parental double helix. E) It stabilizes the unwound parental DNA.
In a colony of 100 guinea pigs, 16 show the recessive trait of bristly hair. What is the percentage of
heterozygotes in the population?
a. 48 percent b. 52 percent c. 36 percent d. 24 percent e. 84 percent
Which of the following fluids within the gastrointestinal tract is correctly paired with its antimicrobial effect?
A. Pancreatic fluid; IgE B. Bile; lactoferrin C. Stomach fluid; high pH D. Saliva; lysozyme
A sick person often has a fever, which can inhibit the growth of bacteria because
A) bacteria reproduce more rapidly at higher body temperature. B) enzymes do not function as well at temperatures other than the optimal temperature. C) the higher temperature increases the activity of lyases. D) sweating removes prosthetic groups from biological enzymes. E) fever blocks synthesis of proteins in the bacterial nucleus.