51. What is true about MHC class 2 molecules? A) The CD8 surface protein is needed for attachment B)...

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Medical Sciences

51. What is true about MHC class 2molecules?
A) The CD8 surface protein is needed forattachment
B) Present exogenous antigens
C) Are found on red blood cells.
D) Trigger release of perforins andfragmentins
E) All of the above
52. Which is false about neuronaldevelopment?
A) The brain grows by 2/3 in the first three monthsafter birth
B) Neurons begin to develop by week 3 of embryonicdevelopment.
C) In adolescence, new neurons are added to define braincircuits more sharply
D) Synaptic pruning takes place duringdevelopment
E) The hippocampus and amygdala arenâ€™t fully functionaluntil age 3
54. Which of the following is not an aspect of the bloodbrain barrier?
A) Hydrophobic molecules can diffuse across thecapillaries
B) Astrocytes provide carrier proteins for selectivetransport
C) Glucose crosses the barrier by GLUT-1carriers
D) Insulin is transported across themembrane
E) All of the above are true

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3.8 Ratings (742 Votes)

51 Major histological complex is divided into MHC I and MHC II MHC I binds to CD8 receptors in T cells while MHC II presents antigen to CD4 receptor on T cells So option A is incorrect RBC do not express any MHC receptors So option C is incorrect MHC ll do not trigger release of perforins and fragmentin So option D is incorrect MHC ll See Answer

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