Allen Is 3 Years Old

question 87

Multiple Choice

Allen is 3 years old. He ignores people when they are in the room, and if people speak to him, he does not make eye contact. He also will not initiate communication, but rather just repeats what someone has said. Finally, Allen plays with a spinning top for hours. He just spins it, watches it, and when it stops spins it again. Allen may be showing signs of _____.

• A) a learning disability
• B) ADHD
• C) autism spectrum disorder
• D) bipolar disorder

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Definitions:

Active Transport

The movement of molecules across a cell membrane from a region of lower concentration to one of higher concentration, requiring energy.

Facilitated Transport

A process of passive transport, mediated by carrier proteins, that allows substances to move across cell membranes without expending energy.

Active Transport

The movement of molecules across a cell membrane from a lower to a higher concentration, requiring energy.

Mitochondria

Organelles within cells that are the sites of aerobic respiration, providing energy for cellular functions.