What Does This Curved Feature, Which Contains a Point Bar

question 60

Multiple Choice

What does this curved feature, which contains a point bar, indicate about past events on Mars?

• A) there were explosive volcanic eruptions
• B) strong winds eroded into a series of volcanic layers
• C) the surface once had running water that eroded and deposited sediment
• D) glaciers once covered the entire planet

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Definitions:

Cytoplasm

The gel-like substance within a cell, excluding the nucleus, that contains organelles and is the site of most cellular processes.

Pre mRNA

The initial, unmodified RNA transcript produced during gene transcription, prior to processing into mRNA.

Inducible Genes

Genes whose expression is either initiated or increased in response to specific stimuli.

Repressor

A protein that binds to specific DNA sequences, preventing the transcription of certain genes and thereby controlling gene expression.