Why Has Finding an Effective AIDS Vaccine Been So Difficult

question 30

Multiple Choice

Why has finding an effective AIDS vaccine been so difficult?

• A)Because it is caused by a virus.
• B)Because they have not yet isolated the virus that causes AIDS.
• C)Because the virus constantly mutates and so vaccines need to be made for all types.
• D)The body does not make antibodies against the virus.
• E)It is a sexually transmitted virus.

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Definitions:

Ciliary Muscles

Ring-shaped muscles located in the eye that control the shape of the lens to focus on objects at varying distances.

Pupil Diameter

The size of the opening in the center of the iris of the eye, which varies to regulate the amount of light reaching the retina.

Hyperpolarizing

Pertains to the increase in a cell's membrane potential, making it more negative.

Photoreceptor Cell

A photoreceptor cell is a type of specialized neuron found in the retina of the eye, responsible for converting light into electrical signals that can be interpreted by the brain as visual images.