Which base pairing is incorrect?
A) G-C
B) U-A
C) A-G
D) A-T
Ans: C) A-G
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It is estimated that there are a total of 50-100 trillion cells in a human body. Starting from a fertilized egg, how many cell divisions would be required to produce 50 trillion cells, assuming that every cell divides in every cycle?
A. 455 divisions B. 45.5 divisions C. 50-100 divisions D. one division per day for nine months
What process is occurring as viruses assemble and exit the cell?
a. active transport b. passive transport c. facilitated diffusion d. endocytosis
Which statement best describes the mechanism of neutralization?
A) Antigens clump together and are more susceptible to phagocytosis. B) Cells are neutralized by toxins injected by natural killer cells. C) It causes pathogenic cells to lyse. D) An antibody blocks an antigen's activity by binding to it. E) Pathogens are bound by antibodies and are more susceptible to phagocytosis.
The close contact between newborns and family members allow them to become ________ with microbes that become established as their microbiota. (Choose the most accurate term.)
A. infected B. parasitized C. colonized D. contaminated E. infiltrated