In sporadic cases of retinoblastoma, only two gene mutations are thought to be necessary in the same cell for a tumor to develop. This happens when an organism inherits a mutant allele and a wild-type allele forms the parents. When the wild-type allele
is mutated, resulting in tumorigenesis, this process is called, ________.
A) gain of heterozygosity
B) metastasizing
C) attenuation
D) loss of heterozygosity
E) recombination
Answer: D
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The species richness of trees can be predicted by
A. the time hypothesis. B. species-area effect. C. patterns of smaller insects. D. the evapotranspiration rate. E. the species-area effect.
Sensory information is transmitted to the CNS by the ____
a. efferent neurons of the autonomic nervous system b. afferent neurons of the peripheral nervous system
c. somatic neurons of the peripheral nervous system d. somatic neurons of the sympathetic division e. efferent neurons of the sympathetic division
Hemophilia is a genetic disorder in which the blood
a. does not contain platelets. b. does not contain white blood cells. c. contains too many platelets. d. does not contain the usual clotting factors. e. contains too many clotting factors.
This process is common to all living cells:
A. Pyruvate oxidation B. Glycolysis C. The Citric acid cycle D. Alcohol fermentation E. Electron transport chain reactions