Activity in the Digestive Tract Begins in Response to the Sight

question 55

Multiple Choice

Activity in the digestive tract begins in response to the sight and smell of food.This is referred to as the _________ response.

• A)cephalic
• B)gastric
• C)intestinal
• D)cognitive

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Definitions:

Ribose

A five-carbon sugar essential in the body for synthesizing nucleotides, DNA, and RNA.

Deoxyribose

A sugar component of DNA molecules, distinguished from ribose by the absence of an oxygen atom on the second carbon.

DNA World

The concept of a "DNA world" refers to the central role of DNA in the biological world as the primary molecule for storing and transmitting genetic information in all living organisms.

Primitive Reducing Atmosphere

The early Earth's atmosphere, thought to be rich in hydrogen and its compounds, facilitating the formation of organic molecules.