Plasma Membrane Lipid Molecules

question 57

Multiple Choice

Plasma membrane lipid molecules

• A) allow ions to diffuse across the membrane against their concentration gradient.
• B) are entirely hydrophobic.
• C) allow ions to diffuse across the membrane down their concentration gradient.
• D) are arranged with their polar, hydrophilic heads facing outward and their hydrophobic tails extending to the middle of the layer.
• E) are arranged with their polar, hydrophilic heads facing inward to the middle of the layer and their hydrophobic tails extending outward.

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Definitions:

Effort

The use of physical or mental energy to do something; exertion towards accomplishing a task.

Persistence

The continued effort to achieve something despite difficulties, failure, or opposition.

Motivation

Represents the internal and external factors that stimulate desire and energy in people to be continually interested and committed to a job, role, or subject.

Intrinsic Motivation

The drive to perform activities for their own sake and for the personal rewards they bring, rather than for external rewards.