A cellular Life | NTS Sindh Mdcat Past Paper MCQs | mosaicbro.com
A cellular Life | NTS Sindh Mdcat Past Paper MCQs
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Review Answers:
1
In 1892 a Russian biologist ______ demonstrated that a virus could be transmitted from an infected organism to a healthy organism of the same kind (1998)
Correct Answer:B
Explanation:
Dmitri Iwanowsky demonstrated viral transmission in 1892, proving viruses could pass through bacterial filters.
2
The nucleic acid of nearly all bacteriophage is (1998)
Correct Answer:D
Explanation:
Most bacteriophages contain DNA, but the question specifies 'nearly all', leaving room for RNA phages.
3
The protein coat of virus is known as (1999)
Correct Answer:D
Explanation:
The protein coat of a virus is called the capsid.
4
A virus is considered a parasite because: I. Harms its host II. Kills its host III. Cannot reproduce outside its host
Correct Answer:C
Explanation:
Viruses are obligate parasites that harm hosts (I) and require host machinery to reproduce (III). Not all viruses kill hosts (II).
5
Encircle the mismatch:
Correct Answer:B
Explanation:
Yellow fever is caused by a virus (Flavivirus), not bacteria.
6
Chicken pox is caused by: (dmc 2011)
Correct Answer:C
Explanation:
Chickenpox is caused by Varicella-zoster virus (VZV), a herpesvirus.
7
The viruses are: (dmc 2011)
Correct Answer:C
Explanation:
Viruses are non-cellular infectious agents.