What is one result of the bottleneck effect?
a. balanced alleles
b. heterozygosity
c. decreased genetic diversity
d. disruptive selection
e. random mating
ANSWER: c
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In addition to sickle-cell anemia, which of the following is associated with abnormal hemoglobin production?
1.aplastic anemia 2.pernicious anemia 3.hemolytic anemia 4.thalassemia 5.iron-deficiency anemia
Ras mutations involving amino acid 12 may be oncogenic if they
a) Destabilize the protein causing it to fall apart b) Increase the cleavage rate of bound GTP back to GDP c) Stabillize the binding of GTP to Ras d) Block the ability of Ras to interact with its normal downstream targets
If the energy of the sun no longer reached Earth, the primary productivity of which of the following ecosystems would be least affected?
A. taiga B. temperate rain forest C. deep sea hydrothermal vent D. desert E. coral reef
Which of the following nitrogenous bases is NOT found in molecules of DNA?
a. adenine b. guanine c. uracil d. thymine e. cytosine