Some scientists are trying to develop a vaccine that would prevent cancer. What is an important consideration?

A. The natural killer (NK) cells already perform this function, which cannot be enhanced.
B. Since cancer cells have self-marking MHC molecules, they cannot be attacked by the immune system.
C. It is not possible-vaccines can only protect against viruses or bacteria.
D. Antigen selection would be critical, due to danger of the body's immune system attacking its own healthy tissue.


Answer: D

Biology & Microbiology

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During the __________, a person recovers from a disease and the body returns to its pre-disease state.

Fill in the blank(s) with the appropriate word(s).

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Assume each of the following letters represents an amino acid. What type of gene mutation occurred to produce the following protein sequence?Normal: JAYBIRDCATPAWMutated: JAYBIRDBATPAW

A. nonsense B. sense C. missense D. frameshift E. silent

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Pyruvate is produced during:

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