Which cells directly attack abnormal cells in the body?
a. Cytotoxic T cells
b. Helper T cells
c. Phagocytes
d. B cells
Ans: a. Cytotoxic T cells
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In humans, male-pattern baldness may be assumed to be controlled by an autosomal gene that occurs in two allelic forms. Allele B determines nonbaldness, and allele b determines pattern baldness. In males, because of the presence of testosterone, allele b
is dominant over B. If a man and woman both with genotype Bb have a son, what is the chance that he will eventually be bald? A) 0% B) 25% C) 33% D) 50% E) 75%
In the Lederberg and Tatum experiment what is the purpose of performing the experiment with the strains without adding them together?
A. It serves as a control to calculate the rate of reversion mutations B. There is no experimental purpose to performing that part of the experiment C. It tests that the strains were made correctly D. It tests to make sure the media was made correctly
Mutations that result in the production of much less of a protein or a protein that functions less efficiently than wild type are
A) null mutations. B) hypomorphic mutations. C) hypermorphic mutations. D) conditional mutations. E) neomorphic mutations.
When two lineages originate from the same branch point, what are they referred to as?
What will be an ideal response?