Each DNA strand serves as which of the
following during DNA synthesis?
a. a replicate
b. a substitute
c. a template
d. a source of nucleotides
e. all of these
C
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The sixth amino acid in normal hemoglobin is
glutamate, but it is replaced by __________ in sickle-cell anemia. a. histidine b. proline c. leucine d. valine e. threonine
Senescence may be counteracted by
a. removal of old flowers. b. removal of seed pods. c. inhibiting nutrient diversion to fruits. d. all of these. e. none of these.
The graphic representation of energy relationships in an ecosystem is a(n) ____
a. Punnett square b. energy flow chart c. energy pyramid d. ecological pyramid e. biomass pyramid
Dr. Ratard was trying to determine the cause of a mysterious epidemic affecting fish in the gulf of New Mexico. His proposal that the deaths were caused by an organism called a protist is considered a(n)
A. experiment. B. hypothesis. C. data set. D. conclusion. E. theory.