What Is the Oncogene That Is Most Often Mutated in Human

question 60

Multiple Choice

What is the oncogene that is most often mutated in human tumors and what does it encode?

• A)the RAS gene, a GTP-binding protein that serves as an on-off switch for a key cell signaling pathway that controls cell proliferation
• B)the RAS gene, a DNA polymerase that replicates DNA for dividing cells
• C)the MYC gene, an RNA polymerase that transcribes mRNA encoding proteins needed for cell division
• D)the RB gene, a GTP-binding protein that serves as an on-off switch for a key cell signaling pathway that controls cell proliferation
• E)the MYC gene, a protein kinase that enhances cell differentiation

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Definitions:

Water Table

The level below which the ground is saturated with water, marking the boundary between the unsaturated zone above and the saturated zone below.

Groundwater

Water that occupies the pores and fractures in underground rock and soil, a critical source of freshwater for drinking, agriculture, and industry.

Spring

A place where groundwater flows out of the ground onto the surface.

Spring

A natural flow of groundwater emerging at the surface, typically where the water table meets the ground surface.