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Communicable Diseases EXAM Stimulator Questions And All Correct Answers.
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Tuberculosis is an infectious disease that affects humans. It is caused by a pathogen Which of the following plant diseases is caused by the same type of pathogen that causes tuberculosis in humans? A black sigatoka in bananas B 'mosaic' leaf discolouration in tobacco plants C ring rot in...

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  • September 4, 2024
  • 13
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • tuberculosis is an infectious disease

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  • Boc serology immunology
  • Boc serology immunology

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Communicable Diseases
EXAM Stimulator Questions And All
Correct Answers.
Tuberculosis is an infectious disease that affects humans. It is caused by a pathogen



Which of the following plant diseases is caused by the same type of pathogen that causes tuberculosis in
humans?



A black sigatoka in bananas

B 'mosaic' leaf discolouration in tobacco plants

C ring rot in tomatoes

D late blight in potatoes - Answer C



Fig. 25.1 shows the concentration of antibodies in a patient's bloodstream following a vaccination
against a common pathogen and subsequent infection with the same pathogen.



Explain why the response to the subsequent infection is much bigger than the response to vaccination,
as shown in Fig. 25.1. (3) - Answer - VACCINATION INVOLVES clonal selection and clonal expansion
(mitosis of selected B cell with complementary antigen

- memory cells already present in response to infection so is much quicker than initial response



Antibodies have a number of mechanisms of action. For example, agglutinins cause pathogens to be
rendered inactive by clumping them together.



Outline the action of opsonins (2) - Answer - increase likelihood of phagocytosis

- binds to pathogen and phagocyte

, Young mammals receive antibodies in their mother's milk. This is an example of which type of immunity?



A artificial active immunity

B artificial passive immunity

C natural active immunity

D natural passive immunity - Answer D



Which of the following descriptions is correct?




A Vaccination gives long-term protection, immunisation gives short-term protection.

B Vaccination involves injection of antigenic material and immunisation is the process of developing
immunity.

C Vaccination involves injection of antigenic material, immunisation is injection of antibodies.

D Vaccination and immunisation have the same meaning. - Answer B - Vaccination involves injection of
antigenic material and immunisation is the process of developing immunity



Which formula would you use to estimate the volume of a neutrophil?

A 4πr

B 2πr

C πr 2 h

D πr - Answer D



Draw a ring on Fig. 23.1 to show a part of the molecule that has a shape complementary to the shape of
an antigen - Answer variable region photo - circle triangle



The component labelled Y on the antibody is a bond. State what type of bond is found here and give its
function. (2) - Answer - disulfide

- holds polypeptide chains together (light chain + heavy chain)

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