A ___________________ is an RNA-containing virus that also contains a viral enzyme called reverse transcriptase that uses a strand of viral RNA as a template to synthesize a single strand of DNA.
a. glycovirus
b. retrovirus
c. influenzavirus
Ans: b. retrovirus
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Down syndrome is associated with
a. mental retardation. b. abnormal skeletal development. c. weak muscle reflexes. d. slowly developing motor functions. e. all of these.
With respect to the alleles for sickle cell anemia, which genotype(s) is (are) at a disadvantage to persons residing in
tropical areas of Africa? a. heterozygous b. homozygous dominant c. homozygous recessive d. both heterozygous and homozygous dominant e. both homozygous dominant and homozygous recessive
High levels of citric acid inhibit the enzyme phosphofructokinase, a key enzyme in glycolysis. Citric acid binds to the enzyme at a different location from the active site. This is an example of _____
A) competitive inhibition B) allosteric regulation C) the specificity of enzymes for their substrates D) positive feedback regulation
Why are ferns considered incompletely adapted to the terrestrial environment, when compared with other plants?
A) They lack vascular tissue. B) Their sperm are flagellated. C) The gametophyte generation is dominant. D) They lack cuticle.