All of the following events occur during T-dependent activation of a B cell EXCEPT
A. an antigenic fragment held within an MCH Class II molecule of a dendritic cell binds to a specific T cell receptor on a naïve T-helper cell.
B. specific cytokines from the T helper cells stimulate maturation and complete activation of the antigen-stimulated B cell.
C. antigen within MCH class II molecule is presented by B cell to an activated T helper cell.
D. antigen binds to specific B cell receptor molecules.
E. antigen bound to the B cell receptor is internalized and transferred to an MHC class II molecule which then moves to the plasma membrane.
F. There are no exceptions. All of these events occur during T-depedent activation of B cells.
Answer: F
You might also like to view...
In his analysis of rII in phage, Benzer assayed complementation
Suppose you try your hand at this with several mutants and get the following results (+ = complementation): 42 and 62 + 42 and 83 – 62 and 63 – 62 and 74 + 42 and 74 – 42 and 75 + 62 and 75 – Mutation 42 has previously been shown to be in a different gene than mutation 62. What can you conclude? A) Mutations 42 and 75 are in the same gene. B) Mutations 62 and 74 are in the same gene. C) Mutations 62, 63, and 74 are in the same gene. D) Mutations 42 and 74 are in the same gene. E) Mutation 63 is not in the same gene as either 62 or 42.
In multiple sclerosis, a victim:a
loses coordination due to the replacement of myelin with scar tissue. b. accumulates neurofibrillary tangles in the brain resulting in dementia. c. suffers tremors due to overly rapid and spontaneous firing of neural impulses. d. is unable to transmit neural impulses because poisons interfere with the action of the ion pumps. e. suffers depression due to abnormal secretion of neurotransmitters
The bones that make up the digits of the hands or feet are known as the ________
A) metatarsals B) carpals C) phalanges D) tarsals
A young man goes to a clinic complaining of discomfort in his foot, especially when standing. Upon examination, the clinician observes raised bumps with rough surfaces on the sole of his foot. These lesions are consistent with
A. whitlow. B. erythema infectiosum. C. molluscum contagiosum. D. shingles. E. warts.