Which white blood cells will harbor the HIV virus during the early infectious stages of AIDS?
a. Macrophages
b. Helper B cells
c. Mast cells
d. Cytotoxic T cells
e. Helper T cells
e
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Which of the following is true about bacteria?
a. some bacteria have nuclei b. some bacteria have lipid bilayers enclosing their DNA c. some bacteria do not have DNA d. some bacteria do not have a cytoplasm e. some bacteria lack a plasma membrane
You are researching a cytoplasmic protein associated with a nerve disorder. The native form of the enzyme appears to be globular protein; however, when a sample of the purified protein is treated with a chemical that reduces disulfide bonds,
the enzymatic activity decreases dramatically and multiple globular proteins can be detected in the sample. What does this tell you about the protein? A) The primary structure of the protein contains multiple cysteine residues that are hydrolyzed by the chemical reductant. B) The protein is most likely composed of multiple polypeptide chains that are held together by disulfide bonds. C) The protein is most likely composed of ? helices that are held together by disulfide bonds. D) The protein is most likely composed of ? sheets that are held together by disulfide bonds. E) The primary and secondary structure of the protein depends on disulfide bonds.
Which scenario best describes a double-blind study?
a. The investigator and the subjects wear blindfolds. b. No one knows what is in the experimental or control group c. The subjects do not know if they are in the experimental or control group. d. Neither the investigator or the subjects know if they are in the experimental or control group. e. The investigator does not know if subjects are in the experimental or control group.
A population carries two alleles for a trait in which T is dominant and t is recessive. In the Hardy-Weinberg equation, q2 represents the
A) proportion of homozygous dominant individuals. B) decrease in heterozygous individuals. C) proportion of homozygous recessive individuals. D) increase in homozygous individuals. E) proportion of heterozygous individuals.