When dealing with stable isotopes, enzymes tend to favor

A) the lighter isotope.
B) the heavier isotope.
C) the isotopes in about equal proportions.
D) either the lighter or the heavier isotope, depending on environmental conditions.


Answer: A

Biology & Microbiology

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One function provided by cell membranes is ____

a. the free passage of materials into and out of the cell b. the exclusion of nucleic acids c. structural integrity d. protection from parasitic genetic information e. to counteract size restrictions

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The instrument that produces a bright image of the specimen against a dark background is called a (n) ________ microscope.

A. bright-field B. electron C. phase-contrast D. dark-field

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Which of the following is a key objective of gene therapy?

a. curing heritable diseases b. multiplying stem cells c. developing new antibiotics d. improving plant hardiness

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Sources for the data that evolutionary biologists use to test their hypotheses are derived from many subdisci-plines of the biological sciences. The five photographs above illustrate some of these sources. Please iden-tify each of the five data sources

What will be an ideal response?

Biology & Microbiology