The extensive infolding of eukaryotic
membranes form structures that allow for
a. the concentration of nutrients.
b. greater surface area for metabolism.
c. the transport of proteins.
d. the protection of metabolic machinery.
e. all of these.
E
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. Of the four types of T cells, only the ____________________ cells destroy infected body cells. Fill in the blank(s) with the appropriate word(s)
In nature, genes with the potential to produce serious defects are acted against and kept at a low
frequency by: a. neutral variations. b. stabilizing selection. c. disruptive selection. d. frequency dependent selection. e. natural selection.
Which scenario best describes a double-blind study?
a. The investigator and the subjects wear blindfolds. b. No one knows what is in the experimental or control group c. The subjects do not know if they are in the experimental or control group. d. Neither the investigator or the subjects know if they are in the experimental or control group. e. The investigator does not know if subjects are in the experimental or control group.
Natural selection acts directly on the genotype of an organism
_______ Indicate whether the statement is true or false.