The difference between normal hemoglobin and sickle-cell hemoglobin is in the
a. heme portion of the molecules.
b. number of chains of amino acids.
c. substitution of a specific amino acid for another specific amino acid.
d. addition of one amino acid to the normal hemoglobin molecule.
e. deletion of only one amino acid from the normal hemoglobin molecule.
C
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There are more helpful types of bacteria on this planet than harmful types.
Indicate whether the statement is true or false.
Which naturally-occurring plant hormone has a major role in the phototropic response of plants?
A. auxin B. gibberellin C. abscisic acid D. ethylene E. 2, 4-D
Most adolescents begin smoking
a. because of its stimulatory effects. b. because it makes them look sophisticated. c. due to the influence of celebrities. d. to defy their parents. e. as a result of social pressures.
If the entropy in a biological system increases, ________________________ increases.
Fill in the blank(s) with the appropriate word(s).