A cell membrane is ______________?
a. permeable
b. semipermeable
c. nonpermeable
d. None of the above
Answer: b. semipermeable
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This is an example of which type of selection?
You are all excited because you just purchased a male guppy that has red, blue and green colors on its fins and tail. Your guppies at home do not have this combination of colors. You place the new male in with three females for mating purposes. After three weeks you have many new baby guppies and most of them have the new color combination. A. Natural. B. Environmental. C. Analogous. D. Convergent. E. Artificial.
Which of the following is a master gene that
controls eye development?
a. PAX6 b. FOXP2 c. ICU d. SRY e. STP
The main problem for those with cystic fibrosis involves ____
a. mucus sticking to dry surfaces b. jerky muscle contractions c. constant thirst d. salt accumulations between tissues
e. low pH in tissues preventing proper enzymatic activityDuring the second stage of labor:a
the cervix begins to dilate. b. the cervix becomes effaced. c. the fetus is "delivered." d. the uterus begins to contract. e. the amnion breaks.