A person with blood group O Rh-negative is called a universal donor because their red cells ____.
Correct answer C. carry no A, B or Rh(D) antigens
Subject / 1,067 questions
MDCAT Biology MCQs
Page 15 of MDCAT Biology multiple-choice questions with answers. Tap an option to check yourself.
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- Biological Molecules 74
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- Bioenergetics 55
- Circulation 50
- Inheritance 48
- Digestion 45
- Immunity 45
- Support and Movement 45
- Acellular Life (Viruses) 45
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- Cell Cycle 41
- Chromosome and DNA 40
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- Ecosystem 27
Which blood group has both A and B antigens on its red cells and no anti-A or anti-B antibodies in its plasma?
Correct answer A. AB
Haemolytic disease of the newborn can occur when ____.
Correct answer D. an Rh-negative mother carries a second Rh-positive foetus after being sensitised
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Lymph from most of the body, including the left side and both legs, finally drains into the blood through the ____.
Correct answer A. thoracic duct into the left subclavian vein
Lymph capillaries differ from blood capillaries in that they ____.
Correct answer B. begin blindly (closed at one end) in the tissues
Lacteals in the villi of the small intestine are lymph vessels that absorb mainly ____.
Correct answer C. fats in the form of chylomicrons
What is the main function of lymph nodes?
Correct answer D. Filtering lymph and housing lymphocytes that respond to pathogens
Which lymphoid organ is the site where T lymphocytes mature?
Correct answer D. Thymus
Which is the largest lymphoid organ in the body and also removes old red blood cells?
Correct answer A. Spleen
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Gross swelling of the legs in elephantiasis is caused by ____.
Correct answer D. blockage of lymphatic vessels by filarial worms
Atherosclerosis is best described as ____.
Correct answer D. deposition of fatty plaques containing cholesterol in the inner walls of arteries
Chest pain during exertion caused by temporary insufficient blood supply to heart muscle through narrowed coronary arteries is called ____.
Correct answer A. angina pectoris
A myocardial infarction (heart attack) occurs when ____.
Correct answer C. a coronary artery is blocked and part of the heart muscle dies
A blood clot that forms in a vessel, breaks free and lodges in a smaller vessel elsewhere is called ____.
Correct answer A. an embolus
Which of the following is a major risk factor for coronary heart disease?
Correct answer A. Cigarette smoking
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Which lymphocytes are mainly responsible for humoral (antibody-mediated) immunity?
Correct answer C. B lymphocytes
In which organ do T lymphocytes complete their maturation?
Correct answer B. Thymus
In humans, where do B lymphocytes mature?
Correct answer D. Bone marrow
Antibody-secreting plasma cells develop directly from which cells?
Correct answer B. Activated B lymphocytes
Which class of immunoglobulin is present in the highest concentration in human blood plasma?
Correct answer D. IgG