If you cross RrYy and RRyy pea plants, what fraction of the offspring will have yellow peas? R = round, r = wrinkled, Y = yellow, y = green.
A. 100%
B. 50%
C. 75%
D. 25%
E. 0%
B. 50%
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Altruism involves ____, but reciprocal altruism involves ____
a. the sacrifice of an individual's reproductive success to help others; the expectation of a future favor in return for present aid b. aid given to nonrelatives; benefits given to close relatives only c. the expectation of a future favor in return for present aid; close relatives helping each other d. low-risk behavior that provides minor benefits to others; high-risk behavior providing major benefits to others e. aid given to relatives; benefits given to nonrelatives only
____ in heart muscle tissue allows for communication between the cells resulting in the coordinated
beating of the heart.
a. Tight junctions b. Desmosomes c. Adherens junctions d. Anchoring junctions e. Gap junctions
A U.S. submarine surfaced ____ miles from the nearest land in the Arctic and found polar bears hunting on the frozen
sea. a. 10 b. 100 c. 200 d. 500 e. 1,000
Which of the following analogies best illustrates the answer to the following: If sugars contain energy, why do we have to break apart sugars to release energy in order to make the high energy chemical called ATP?
a. electrons of matter b. photons of light c. letters in the word d. books in the library