Which One of the Following Statements About the Molecules B7-1

question 10

Multiple Choice

Which one of the following statements about the molecules B7-1 and B7-2 is NOT true?

• A)B7-1 and B7-2 expression on antigen-presenting cells (APCs) is upregulated by the presence of "danger" signals, such as lipopolysaccharide, as well as cytokines, such as interferon (IFN)-ƴ
• B)B7-1 and B7-2 are expressed at low levels on some resting APCs.
• C)Induction of B7-1 usually occurs before the induction of B7-2 in an immune response.
• D)B7-1 and B7-2 bind to CD28 on T cells and provide "second signals" for naive T cell activation.
• E)Activated helper T cells can induce expression of B7-1 and B7-2 on APCs via CD40L binding to CD40.

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Definitions:

Communicate

The process of transmitting information, ideas, emotions, skills, or knowledge from one individual or group to another through various means, verbal or non-verbal.

Estrogens

a group of steroid hormones that play a key role in the development and functioning of female reproductive tissues and secondary sexual characteristics.

Peak

The highest point or maximum level of something, often referring to the top of a mountain or the highest level of achievement or performance.

Ovulation

Ovulation is the phase of a female's menstrual cycle during which a mature egg is released from the ovary, making it available for fertilization by sperm.