Acellular Life — Biology MCQs (Class 11)
Free chapter-wise Biology MCQs with answers for MDCAT, FSc and entry tests.
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#25 Viroids are known to cause diseases in:
A) Animals
B) Humans
C) Plants
D) Bacteria
#26 The infectious agent that causes scrapie in sheep and Mad Cow disease is a:
A) Viroid
B) Bacteriophage
C) Prion
D) Retrovirus
#27 Prions are infectious agents composed of:
A) Proteins only
B) RNA only
C) DNA only
D) Both DNA and protein
#28 The protein responsible for prion diseases is a misfolded version of a normal protein called:
A) PrP^C
B) PrP^Sc
C) PrP^D
D) PrP^A
#29 The most common form of a prion disease in humans is:
A) Kuru
B) Creutzfeldt-Jakob disease (CJD)
C) Fatal familial insomnia
D) Scrapie
#30 Which of the following is not a characteristic of viruses?
A) They are filterable
B) They are obligate intracellular parasites
C) They have cellular organelles
D) They can crystallize
#31 The discovery of viruses was first attributed to the work of:
A) Louis Pasteur
B) Robert Koch
C) Dmitri Ivanovsky
D) Anton van Leeuwenhoek
#32 What is the approximate size range of most viruses?
A) 1-10 nm
B) 20-300 nm
C) 500-1000 nm
D) 1-5 µm
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