Why would individuals with HIV sometimes contract a pneumonia infection that's rare in the rest of the population?

A) They lack helper T cells.
B) They produce too many antibodies to the virus.
C) They possess more antigen diversity.
D) They lack B lymphocytes.


A

Biology & Microbiology

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Why is it necessary to have a standard for the interpretation of stable isotope ratios?

A) A standard is necessary to calculate how much radioactivity was added to a sample. B) A standard is necessary to determine the stable isotope ratio in the absence of biological activity. C) A standard is necessary to determine the weight of each isotopes. D) A standard is necessary to determine the age of the sample.

Biology & Microbiology

Why is nonhomologous end joining usually not a random joining of ends?

What will be an ideal response?

Biology & Microbiology

The degeneration of nuclei is occurring in step(s)

a. 4. b. 5. c. 8. d. 4 and 5. e. 4 and 8.

Biology & Microbiology

Creutzfeldt-Jacob disease is

A. caused by a viroid. B. also called "mad cow disease." C. caused by a chronic latent virus. D. initiated by an oncogenic virus. E. a spongiform encephalopathy of humans.

Biology & Microbiology