Mutations That Cause the Cell to Divide Rapidly,even in the Absence

question 65

Multiple Choice

Mutations that cause the cell to divide rapidly,even in the absence of a signal to divide,are usually mutations of

• A) proto-oncogenes.
• B) tumor-suppressor genes.
• C) DNA polymerase.
• D) cell-surface proteins.
• E) DNA-repair enzymes.

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Definitions:

Macrophages

A variant of white blood cell that is specialized in ingesting and decomposing cellular remnants, alien substances, pathogens, and cancerous cells by means of a procedure referred to as phagocytosis.

Arrector Pili

Small muscles attached to hair follicles that, when contracted, cause hair to stand on end - a phenomenon often associated with cold or fright, known as "goosebumps."

Dermal Root Sheath

The part of the hair follicle that provides a protective layer and is involved in hair growth, derived from the dermis.

Papillary Layer

The uppermost layer of the dermis, directly underneath the epidermis, rich in blood vessels and sensory neurons.