Which antibody class is able to cross the placenta and give the fetus protection?
Correct answer D. IgG
Subject / 1,067 questions
MDCAT Biology MCQs
Page 16 of MDCAT Biology multiple-choice questions with answers. Tap an option to check yourself.
Page 16 of 54
- Biological Molecules 74
- Coordination and Control 72
- Biology Diagnostic 70
- Cell Structure and Function 67
- Biotechnology 65
- Reproduction 58
- Bioenergetics 55
- Circulation 50
- Inheritance 48
- Digestion 45
- Immunity 45
- Support and Movement 45
- Acellular Life (Viruses) 45
- Homeostasis 45
- Respiration and Gaseous Exchange 45
- Evolution 45
- Enzymes 45
- Cell Cycle 41
- Chromosome and DNA 40
- Biology Introduction 38
- Ecosystem 27
Which antibody exists as a pentamer and is the first class produced during a primary immune response?
Correct answer D. IgM
Which antibody class is found mainly in secretions such as tears, saliva and colostrum?
Correct answer D. IgA
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Arthritis is best defined as ____.
Correct answer D. inflammation of one or more joints
Rheumatoid arthritis differs from osteoarthritis in that it is ____.
Correct answer A. an autoimmune disease in which the synovial membrane becomes inflamed
Gout is a form of arthritis caused by deposition of crystals of ____ in joints.
Correct answer B. sodium urate (uric acid)
Osteoporosis is characterised by ____.
Correct answer D. reduced bone mass making bones porous and fragile
Which measure helps to reduce the risk of osteoporosis?
Correct answer C. Adequate calcium and vitamin D intake with weight-bearing exercise
Which chamber of the human heart has the thickest muscular wall?
Correct answer D. Left ventricle
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The valve between the right atrium and right ventricle is the ____.
Correct answer D. tricuspid valve
What prevents the atrioventricular valve cusps from turning inside out into the atria when the ventricles contract?
Correct answer A. Chordae tendineae attached to papillary muscles
Which blood vessels open into the right atrium?
Correct answer A. Superior vena cava, inferior vena cava and coronary sinus
Which vessel carries deoxygenated blood away from the heart?
Correct answer D. Pulmonary artery
The heart muscle receives its own oxygenated blood supply through the ____.
Correct answer D. coronary arteries
The middle muscular layer of the heart wall is the ____.
Correct answer B. myocardium
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The natural pacemaker of the human heart is the ____.
Correct answer D. sinoatrial (SA) node
What is the main function of the short delay of impulses at the atrioventricular (AV) node?
Correct answer D. It allows the atria to finish contracting before the ventricles contract
Which part of the conducting system spreads impulses rapidly through the walls of the ventricles?
Correct answer A. Purkinje fibres
Heart muscle is described as myogenic because ____.
Correct answer D. its contraction is started by impulses generated within the heart itself
At a heart rate of 75 beats per minute, how long does one cardiac cycle last?
Correct answer A. 0.8 s