A single, quick contraction of skeletal muscle is called a:
a. simple twitch.
b. tetanus.
c. brief contraction.
d. red fiber contraction.
e. white fiber contraction.
A
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Which statement about the macronucleus and the micronucleus of ciliates is correct?
A. The macronucleus is diploid and the micronucleus is haploid. B. The macronucleus forms by the fusion of micronuclei from two different mating types. C. The micronucleus is formed by fission of the macronucleus. D. The micronucleus transmits genetic information through mitosis and meiosis, while the macronucleus maintains routine cellular functions.
The cascade of enzyme reactions that ends in clot formation is begun by ________
a. the exposure of collagen in the damaged vessel wall b. albumin contacting the basement membrane c. the conversion of fibrinogen to fibrin d. exposure of blood to air
Which group of protists consumes CO2 and produces O2 for much of Earth, serving as the base of food webs in lakes, streams, and the oceans?
A. algae B. radiolarians C. amoeba D. protozoa E. slime mold
Which of these is an electron carrier molecule?
A. ATP B. Carbonic acid C. Adenylate kinase D. NAD+