Dengue fever is caused by a virus carried from person to person by ____.
Correct answer C. Aedes mosquitoes
Subject / 1,067 questions
MDCAT Biology MCQs
Page 27 of MDCAT Biology multiple-choice questions with answers. Tap an option to check yourself.
Page 27 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 viral disease was declared eradicated worldwide in 1980 after a global vaccination campaign?
Correct answer D. Smallpox
Rabies virus is usually transmitted to humans through ____.
Correct answer B. the bite of an infected animal such as a dog
Advertisement
Viruses are described as acellular mainly because they ____.
Correct answer B. lack cellular organisation and their own metabolic machinery
The protein coat of a virus is built from repeating subunits called ____.
Correct answer C. capsomeres
From where does an enveloped animal virus usually obtain the lipid of its envelope?
Correct answer C. From the host cell membrane during budding
Tobacco mosaic virus has which type of capsid symmetry?
Correct answer D. Helical (rod-shaped)
Adenovirus, with 20 triangular faces, is an example of a virus with ____ symmetry.
Correct answer B. polyhedral (icosahedral)
Bacteriophage T4, which has a polyhedral head attached to a tail with fibres, is classed as having which structure?
Correct answer D. Complex
Advertisement
What is the genetic material of tobacco mosaic virus?
Correct answer D. Single-stranded RNA
Which virus has a genome of double-stranded RNA?
Correct answer B. Rotavirus
Bacteriophage φX174 is unusual because its genome is ____.
Correct answer B. single-stranded DNA
What is true of the nucleic acid content of a single virus particle?
Correct answer C. A virus contains either DNA or RNA, never both
Most viruses that infect flowering plants contain which nucleic acid?
Correct answer B. RNA
Viruses that infect bacteria are known as ____.
Correct answer D. bacteriophages
Advertisement
The host range of a virus is mainly decided by ____.
Correct answer D. the fit between viral attachment proteins and receptors on the host cell surface
Which scientist first crystallised tobacco mosaic virus, showing that a virus could behave like a chemical?
Correct answer C. W. M. Stanley
Ivanovsky’s 1892 experiment on diseased tobacco sap showed that the infectious agent ____.
Correct answer D. passed through filters that held back bacteria
Most viruses can be seen clearly only with ____.
Correct answer D. an electron microscope
Why do viruses show no living activity when outside a host cell?
Correct answer C. They lack enzymes and ribosomes needed for metabolism and protein synthesis