Sarah Is a Medical Student

question 161

Multiple Choice

Sarah is a medical student.She is examining the brain of a patient who had Alzheimer's.What would she notice about the brain as she examines it?

• A) The brain is larger since it grows many tumors.
• B) The size of the brain is normal.
• C) The "creases" in the brain have gotten shallower.
• D) The brain is smaller because it has shrunk due to cell loss.

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Definitions:

Aquatic Invertebrate

Aquatic invertebrates are animals without backbones that live in water environments; these include species such as mollusks, worms, and corals.

Terrestrial Invertebrate

An animal lacking a backbone, living on land, such as insects, spiders, and worms.

Gene Regulatory Network

A gene regulatory network is a collection of molecular regulators that interact with each other and with other substances in the cell to govern the gene expression levels of mRNA and proteins.

Transcription Factor

A transcription factor is a protein that regulates the expression of a gene by binding to a specific DNA sequence in association with the gene sequence. A single transcription factor can regulate many genes if they share the same regulatory sequence.