Technician a Says Vacuum for Most Power Brake Systems Is

question 14

Multiple Choice

Technician A says vacuum for most power brake systems is supplied by the engine intake manifold. Technician B says many late-model cars that use intake manifold vacuum as the power source for the power brakes have a vacuum reservoir. Who is correct?

• A)A only
• B)B only
• C)Both A and B
• D)Neither A nor B

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Definitions:

Poly-A Tail

A stretch of adenine nucleotides added to the 3' end of a newly synthesized messenger RNA molecule, protecting the mRNA and aiding in its export from the nucleus.

Guanine Cap

A modified form of guanine nucleotide added to the 5' end of eukaryotic mRNA, playing a critical role in RNA stability and the initiation of translation.

Posttranscriptional Control

The regulation of gene expression at the RNA level, after the process of transcription, affecting mRNA splicing, transportation, stability, and translation efficiency.

Tumor-suppressor Genes

Genes that help regulate cell growth and division, and can prevent the development of tumors by inhibiting cell proliferation.