What are the characteristics of helper T cells?
They bind to infected cells and are activated by cytokines.
They activate B cells and produce small cells called cytokines
They destroy infected cells by producing proteins targeting cell membranes.
They are non-responsive during active infections.
The Correct Answer is B
A. They bind to infected cells and are activated by cytokines:
This describes cytotoxic T cells (CD8+ cells), which kill infected cells, not helper T cells.
B. They activate B cells and produce small cells called cytokines:
Helper T cells (CD4+ cells) stimulate B cells to produce antibodies and secrete cytokines to coordinate the immune response.
C. They destroy infected cells by producing proteins targeting cell membranes:
Again, this is the role of cytotoxic T cells, not helper T cells.
D. They are non-responsive during active infections:
Helper T cells are highly active during infections, directing other immune cells. They are not non-responsive.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Mitral stenosis:
Mitral stenosis is narrowing of the mitral valve, often due to rheumatic heart disease, not IV drug use or infection.
B. Angina pectoris:
Angina is chest pain due to ischemia, not infection or vegetation on heart valves.
C. Aortic insufficiency:
Aortic insufficiency is leakage of the aortic valve, leading to volume overload, not typically associated with infection and petechiae.
D. Infective endocarditis:
IV drug users are at high risk for infective endocarditis. Symptoms include fever, chills, weakness, petechiae, and vegetations seen on echocardiogram.
Correct Answer is A
Explanation
A. An intervening sequence that does not encode for proteins:
Introns are non-coding sequences within a gene that are removed during RNA splicing before translation.
B. The portion of the transcript that encodes for protein:
This describes an exon, not an intron.
C. A person with a recessive allele that the dominant allele silences:
This describes a carrier in genetics, not an intron.
D. One of a pair of genes that is inherited from a parent:
This describes an allele, not an intron.
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