Homework Answers
Answer: B and C
Both Notch and Wnt ligands are necessary for the early development of the T cell. They were first found in drosophila and works in cascades of reaction which leads to the development of pf T cells. Notch signalling is necessary for differentiation while Wnt is necessary for proliferation. The specialised epithelial cells present in the stromal compartment in the thymus provides everything necessary for the development of the thymocytes like Wnt protein and Notch ligands and other proliferating and differentiation factors.
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Which of the following is true regarding the lineage decisions during T cell development? Notch ligands...
All of the following are true regarding B-cell development EXCEPT: A. B cells complete maturation in...
All of the following are true regarding B-cell development EXCEPT: A. B cells complete maturation in the spleen. B. B cells are mostly developed when they leave the bone marrow. C. B cells cannot present antigens to T cells. D. Self-reactive B cells may be eliminated though apoptosis. E. Self- reactive B cells may be rendered unreactive (anergic).
Which of the following statements is (are) true of a T cell that expresses two α chains (and thus...
Which of the following statements is (are) true of a T cell that expresses two α chains (and thus two different T-cell receptors) as a result of ineffective allelic exclusion of the α chain during rearrangement? There will be two unique TCRs on the surface of this T cell. Engaging either of the T-cell receptors on MHC molecules of the thymic epithelium will result in positive selection. If either T-cell receptor binds strongly to self-peptide presented by self-MHC molecules, the...
2. Which of the following cells are leukocytes? a. NK cells b. neutrophils c. monocytes d....
2. Which of the following cells are leukocytes? a. NK cells b. neutrophils c. monocytes d. all of the above e. none of the above 3 Which of the following cells are lymphocytes? a. NK cells b. neutrophils c. monocytes d. all of the above e. none of the above 4. Why do complement proteins not damage healthy cells normally? a. Complement proteins must be produced by activated leukocytes. b. Complement proteins must be activated by enzymatic cleavage. c. Leukocytes...
Which of the following statements are TRUE about innate immunity? A. Antigen-loaded dendritic cells (DCs) enter...
Which of the following statements are TRUE about innate immunity? A. Antigen-loaded dendritic cells (DCs) enter the lymph node (LN) via the blood vessels while aive T cells enter via afferent lymphatics. B. Both antige-loaded DCs and naive T cells enter LN via blood vessels. C. Antigen loaded DCs and naive T cells enter LN via afferent while navie T cells enter via blood vessels D. Both antigen-loaded DCs and naive T cells enter LN via the afferent lymphatics. E....
1. Which of the following complement activation pathways can be activated by antibodies? a. Lectin activation...
1. Which of the following complement activation pathways can be activated by antibodies? a. Lectin activation pathway b. Classical activation pathway c. Alternate activation pathway d. All of the above can be activated by antibodies. e. None of the above can be activated by antibodies. 2. Which of the following cells are leukocytes? a. NK cells b. neutrophils c. monocytes d. all of the above e, none of the above 3 Which of the following cells are lymphocytes? a. NK...
34. Which of the following is true regarding the cell cortex? a) it gives red...
34. Which of the following is true regarding the cell cortex? a) it gives red blood cells their characteristic flattened shape b) it restricts the movement of certain proteins in the lipid bilayer c) it supports and reinforces the plasma membrane d) it contains filamentous proteins connected to transmembrane proteins by attachment proteins e) all of these are true
31. Which part of this T cell receptor is produced only AFTER the T cell has...
31. Which part of this T cell receptor is produced only AFTER the T cell has bound an antigen? A. The part labeled "A" B. The parts labeled "B" C. The entire T cell receptor D. None of it. It is all produced BEFORE antigen binding. E. T cells don't bind antigens; only antibodies do that. 37. How do Treg cells differ from Th cells? A. When Treg cells bind B7, they engulf and destroy it. B. Treg cells secrete...
All the answers please 47. Which of the following are correct regarding neurons A conduct or...
All
the answers please
47. Which of the following are correct regarding neurons A conduct or propagate electrical activity B. secretes neurotransmitters C. may serve as a target cell D. all of the above E. choice A and 8 48. Which of the following are true regarding intracranial structures A. the two cerebral hemispheres are separated by the tentorium cerebelli 8. the cerebral hemispheres are joined together by the corpus callosum C. CSF flows from the aqueduct of sylvius to...
Which of the following sentences is true regarding caspases? a. Caspases are released from mitochondria during...
Which of the following sentences is true regarding caspases? a. Caspases are released from mitochondria during necrosis b. Caspases become activated during apoptosis by phosphorylation c. Caspases exist as inactive pro-caspases in healthy cells d. Caspases are released from mitochondria during apoptosis e. Caspases become activated during apoptosis by binding to Bax
Which of the following is true regarding the confirmation bias? a. It is a bias toward...
Which of the following is true regarding the confirmation bias? a. It is a bias toward seeking to confirm our hypotheses and our view of the world. b. It may lead us to ignore disconfirming evidence. c. It may lead us to dismiss disconfirming evidence d. All of the above 7. Consider a simple experiment using an alley maze using one of three different reinforcement schedules (Schedule A, B, or C). What is the independent variable in this experiment? a....
2. Which of the following cells are leukocytes? a. NK cells b. neutrophils c. monocytes d. all of the above e. none of the above 3 Which of the following cells are lymphocytes? a. NK cells b. neutrophils c. monocytes d. all of the above e. none of the above 4. Why do complement proteins not damage healthy cells normally? a. Complement proteins must be produced by activated leukocytes. b. Complement proteins must be activated by enzymatic cleavage. c. Leukocytes...
1. Which of the following complement activation pathways can be activated by antibodies? a. Lectin activation pathway b. Classical activation pathway c. Alternate activation pathway d. All of the above can be activated by antibodies. e. None of the above can be activated by antibodies. 2. Which of the following cells are leukocytes? a. NK cells b. neutrophils c. monocytes d. all of the above e, none of the above 3 Which of the following cells are lymphocytes? a. NK...
31. Which part of this T cell receptor is produced only AFTER the T cell has bound an antigen? A. The part labeled "A" B. The parts labeled "B" C. The entire T cell receptor D. None of it. It is all produced BEFORE antigen binding. E. T cells don't bind antigens; only antibodies do that. 37. How do Treg cells differ from Th cells? A. When Treg cells bind B7, they engulf and destroy it. B. Treg cells secrete...
All
the answers please
47. Which of the following are correct regarding neurons A conduct or propagate electrical activity B. secretes neurotransmitters C. may serve as a target cell D. all of the above E. choice A and 8 48. Which of the following are true regarding intracranial structures A. the two cerebral hemispheres are separated by the tentorium cerebelli 8. the cerebral hemispheres are joined together by the corpus callosum C. CSF flows from the aqueduct of sylvius to...
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