Use the Following Information to Answer the Next Few Questions

question 58

Multiple Choice

Use the following information to answer the next few questions.
In a famous study, women were asked to smell and rate the attractiveness of axillary odours on t-shirts worn by different men. Results showed that ovulating women preferred the odour of the t-shirts worn by MHC (major histocompatibility complex) dissimilar men. This indicates that dissimilarity in MHC may play a role in mate selection.
-The purpose of an MHC molecule is to

• A)display an antigen fragment on the cell surface.
• B)engulf the presented pathogen.
• C)release enzymes to catalyze apoptosis.
• D)trigger lymphocyte proliferation.
• E)secrete cytokines.

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Definitions:

Lines of Magnetic Flux

Imaginary lines representing the strength and direction of a magnetic field, where the density of lines indicates the field's intensity.

Synchronous Speed

The speed at which the magnetic field in an AC motor rotates, dependent on the frequency of the supply current and the number of poles in the motor.

Turning Torque

The torque required to initiate rotation of a body from rest or to maintain rotation at a constant angular velocity.

Maximum Positive Voltage

The highest voltage level in the positive direction that a system or component is designed to handle.