Which group of organisms are likely to live in the low tide zone?
a) Hermit crab, rock weed, sea lettuce
b) Rock louse, periwinkle, limpet
c) Buckshot barnacle, striped shore crab
d) Sea star, brittle star, sea urchins
Answer: d) Sea star, brittle star, sea urchins
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Prosthecae are an adaptation for
A) anaerobic growth. B) cell differentiation under harsh conditions. C) nitrogen fixation. D) low nutrient aquatic environments.
Replication of DNA
(a) takes place during interphase. (b) results in two double helices from one. (c) is semiconservative. (d) is all of the above.
Which of the following statements concerning enzymes is FALSE?
a. Each enzyme has an optimal temperature. b. Each enzyme has an optimal pH. c. Most enzymes are highly specific. d. Some enzymes require cofactors. e. Most enzymes are RNA molecules
Which of the following statements about PCR is not true?
A. The amount of DNA doubles with each replication cycle. B. PCR can create millions of copies of a segment of DNA in a test tube. C. PCR stands for "polymerizing copies of RNA." D. The target is repeatedly replicated. E. PCR uses DNA polymerase.