Which of the following does not transmit the AIDS virus?
A. Vaginal secretions
B. Semen
C. Blood
D. Mosquitoes
Answer: D
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When antibodies bind antigens, the clumping of antigens results from _____
A) the antibody having at least two binding regions B) disulfide bridges between the antigens C) a complement that makes the affected cells sticky D) bonds between class I and class II MHC molecules E) denaturation of the antibodies
The critical period is
A) the time during which a sperm can fertilize an oocyte. B) the time during which an embryo can implant in the uterine lining. C) the time during development when structures are sensitive to damage from a mutation, toxin, or virus. D) the labor period.
With regard to photosynthesis,
photorespiration a. is more efficient in producing carbohydrates. b. predominates in C3 plants in cool weather when water is plentiful. c. predominates in C4 plants on hot days. d. produces the same amount of PGA. e. does none of these
Cells grown in a petri dish tend to divide until they form a thin layer covering the bottom of the dish. If cells are removed from the middle of the dish, the cells bordering the open space will begin dividing until they have filled the empty space. What does this experiment show?
A. Cells continue to grow as long as there is adequate space. B. The controls on cell growth and division can be turned on and off. C. When cells come into contact with other cells, they stop growing. D. Cell division can be regulated by factors outside of the cell. E. All of the answer choices are correct.