Which Factors on the Surfaces of B Cells and T

question 33

Multiple Choice

Which factors on the surfaces of B cells and T cells, through their interaction, are required to allow germinal center formation to occur?

• A)CD40 and CD40L.
• B)Fas and FasL.
• C)CD28 and CD80/86.
• D)TCR and MHC class II.
• E)None of the answers are correct.

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Definitions:

Trichromatic Theory

A theory of color vision that proposes humans perceive color through the relative rates of response by three kinds of cones, each one sensitive to a different color.

Hair Cells

Sensory receptors located in the cochlea that detect sound waves and transduce them into signals that ultimately are processed in the brain as sound.

Hearing

The process by which sound waves are interpreted by the brain, allowing individuals to perceive sound.

Difference Threshold

The minimum noticeable difference that an individual can detect between two stimuli 50% of the time.