Food and water appetites are under the regulatory influence of the _____
A) cerebrum
B) thalamus
C) hypothalamus
D) medulla oblongata
C
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Several genetic disorders, including Fanconi anemia and ataxia telangiectasia, are caused by mutations in ____
a. the cell wall b. mitochondrial DNA c. ribosome structure d. DNA repair genes e. DNA polymerase genes
In this figure, the magnitude of the secondary response is due to ____________________
a. the presence of memory cells b. the presence of antibodies that remain in the body after a first-time infection c. the activity of killer T-cells d. antibodies introduced when someone receives a vaccination
The hypothesis that mitochondria and chloroplasts originated from the phagocytic activity of
prokaryotes that was not followed by digestion is called the
a. theory of natural selection. b. endosymbiotic hypothesis. c. ribozymes-first hypothesis d. Oparin-Haldane hypothesis. e. stromatolite hypothesis
How does the diameter of a prokaryotic cell compare to the diameter of a eukaryotic cell?
A) Prokaryotes have twice the diameter of a eukaryote. B) Prokaryotes have one-half the diameter of a eukaryote. C) Prokaryotes have one-tenth the diameter of a eukaryote. D) Prokaryotes have one-thousandth the diameter of a eukaryote.