What affects the rate of diffusion through a selectively permeable membrane?
I. concentration gradient
II. temperature
III. molecular size
a. I only
b. II only
c. I and II
d. II and III
e. I, II, and III
ANSWER: e
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Assume that the mutation rate for a given gene is 5 × 10?6 mutations per generation. For that gene, how many mutations would be expected if 10 million sperm are examined?
A) none B) 5 × 10?6 C) 5 D) 50 E) 500
Fragments of DNA have been extracted from the remnants of extinct woolly mammoths, amplified, and sequenced. These can now be used to _____
A) introduce certain mammoth traits into relatives, such as elephants B) clone live woolly mammoths C) appreciate the reasons why mammoths went extinct D) better understand the evolutionary relationships among members of related taxa
How do fishes respire?
A) operculum B) lamellae C) caudal D) cloaca
The duck-billed platypus and other monotremes differ from other mammals in that they
A) are aquatic. B) lay eggs. C) have mammary glands. D) have hair.