The difference between normal and sickle-cell hemoglobin is based upon the
a. number of amino acids in the molecule.
b. substitution of one amino acid for another.
c. number and orientation of the amino acid chains attached to the heme portion of the molecule.
d. number of oxygen molecules that can be carried.
e. type of bone marrow that produces it.
ANSWER: b
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What is the pattern component of the theory of chemical evolution?
A) Heat and electrical discharges were required for chemical evolution to occur. B) Most chemical evolution occurred at black smokers. C) The process occurred at black smokers, in the atmosphere and oceans, or in outer space. D) Increasingly complex carbon-containing molecules formed early in Earth history.
From an evolutionary perspective, germ-line mutations are more significant than somatic mutations. This is because:
A. somatic mutations affect only one or a few cells. B. somatic mutations are generally harmful. C. only germ-line mutations will appear in an individual's descendants. D. only germ-line mutations are potentially beneficial. E. somatic mutations affect only one or a few cells and only germ-line mutations will appear in an individual's descendants. Answer Point Value: 1.0 points Answer Key: C 5 Remember that, in Mendel's garden peas, the yellow gene determines flower color, with the A (yellow) allele dominant to the a (green) allele. In a population of 200 plants, the genotype frequencies are 50% AA, 25% Aa, and 25% aa. What are the allele frequencies? A. 50% A, 50% a B. 50% A, 25% a C. 87.5% A, 12.5% a D. 62.5% A, 37.5% a E. 75% A, 25% a
The process by which an amoeba engulfs a food particle is termed
a. osmosis b. diffusion c. receptor-mediated endocytosis d. pinocytosis e. phagocytosis
There is a molecule in black licorice that inhibits an enzyme which normally limits activation of mineralocorticoid receptors. Thus, overconsumption of licorice can mimic the effect of excess aldosterone. What would be the result?
A. Hypertension (high blood pressure) due to insufficient potassium in the blood B. Infertility in men C. Excessive body hair D. Low blood pressure due to excessive potassium in the blood