During IVF, where does conception occur?
A. in the fimbriae
B. in the oviducts
C. in the vagina
D. in the uterus
E. in the laboratory
Answer: E
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A scientist wants to conduct an experiment to see if plants will grow to different heights based on the type of fertilizer used. If the scientist provides the plants with the same amount of water every day, the water would represent which of the following?
a. a dependent variable b. an independent variable c. a control d. a placebo
When a species dies, the species is said to be:
a. extinct. b. extant. c. endangered. d. threatened. e. endemic
Portion of Figure 21.11
?
Refer to the accompanying figure for questions 26-28.
Which letter points to the stipe?
A. A B. B C. C D. D E. E
For surfaces that have not been cleaned for a long time, sometimes applying a proven disinfectant does not work. These surfaces also must be scrubbed (agitated). Why does scrubbing the surface make the disinfectant work better?
A) Bacteria may have formed a biofilm, and scrubbing the surface helps the disinfectant penetrate the slime layer of the biofilm. B) The scrubbing action oxidizes the disinfectant and improves its efficacy. C) Scrubbing often produces bubbles, the bubbles improve the efficacy of the disinfectant.