Who was/were the first person(s) to propose sexual selection as an evolutionary mechanism?
a. Maynard-Smith c. Darwin and Wallace
b. Darwin d. Fisher, Haldane, and Wright
C
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A large watermelon fruit is very heavy and contains nearly 90% water. Since the skin of a watermelon is thick and lacks stomata, transpiration does not "pull" water into the watermelon. So, how does all that water get into the fruit?
A. Root pressure pushes water into the watermelon. B. Water enters by osmosis from the soil. C. Water is pumped in by active transport. D. Water is transported in the phloem along with the sugars while they are being translocated into the fruit. E. Watermelons, like other fruit, contain an abundance of xylem. Clarify Question What is the key concept addressed by the question? What type of thinking is required? What key words does the question contain and what do they mean? Gather Content What do you already know about how water moves through the tissues in a plant? How does it relate to the question? Consider Possibilities What other information is related to the question? Which information is most useful? Choose Answer Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which of the following has a single strand of DNA shaped like a loop?
a. Plasmids b. Prokaryotes c. Eukaryotes d. Gametes
The pigment that gives color to diatoms is
a. phycobilin. b. chlorophyll. c. algin. d. fucoxanthin. e. carrageenan.
If the prostate gland failed to add its enzyme-rich fluid to semen, the
A) semen would exhibit reduced fluidity, hampering the ability of sperm to swim freely in the vagina. B) sperm would starve from lack of fructose. C) egg would be killed by the acidic vaginal secretions. D) semen would lack lubricating mucus. E) acrosome would rupture prematurely.