Which one of the following is NOT a component of each monomer used to make proteins?
A) a phosphorus atom, P
B) an amino functional group, NH2
C) a side chain, R
D) a carboxyl group, COOH
Answer: A
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Individual skeletal muscle cells are packed with cylindrical contractile elements about 1 mm in
diameter called
a. muscle fibers. b. sarcomeres. c. tendons. d. ligaments. e. myofibrils.
As a fish forces water across its gill, the blood flowing through the gill
a. picks up O2 over the whole route of exchange. b. picks up O2 during the first half of the exchange path, then equilibrates. c. picks up O2 over the second half of the exchange route only. d. removes O2 from the gill and then releases most of its O2 back to the gill. e. releases O2 over the whole route of exchange.
For animals to reproduce on land they needed to use
A. internal fertilization. B. asexual reproduction. C. puddles of water. D. None of the above is correct.
The flagella of archaea are similar to bacterial flagella but differ in that they
A) lack a basal body. B) move like a whip. C) are anchored in the cytoplasm. D) are hollow. E) are driven by ATP hydrolysis.