This document contains multiple choice questions about viruses, bacteria, and cyanobacteria. It begins with 7 questions about the basic nature and discoveries of these microorganisms. The next 15 questions require selecting the microorganism that matches the statement from options for viruses, bacteria, cyanobacteria, or multiple choices. The following questions cover the composition and characteristics of viruses and bacteria such as their size, shape, and whether they contain DNA, RNA, or both. The document concludes with an answer key for all 35 questions.

1. Chapter 4
Virus, Bacteria and Cyanobacteria
(As are the virus and bacteria enemies of
your body so are the ignorance and senseless
songs enemies of your soul)
Biology MCQs: 1 Dr. Sajid Ali Talpur

2. 1. Bacteria are heterotrophes:
a) true b) false
2. Viruses are:
a) parasites b) obligate parasites
c) temperate parasites d) autotrophes
3. The word virus is derived from a Latin word
viron which means:
a) bad air b) vital
c) disease causing d) poison
4. All the microorganisms except bacteria and
cyanobacteria are eukaryotes:
a) true b) false
5. ______discovered tobacco mosaic virus (TMV):
a) Iwanosky b) Stanely
c) Leuwenhoek d) Robert Hook
e) N.O.T
6. Bacteria were discovered by:
a) Iwanosky b) Stanely
c) Leuwenhoek d) Robert Hook
e) N.O.T
7. Cyanobacteria were discovered by:
a) Iwanosky b) Stanely
c) Leuwenhoek d) Robert Hook
e) N.O.T
8. All viruses cause damage to their host:
a) true b) false
Biology MCQs: 2 Dr. Sajid Ali Talpur

3. Questions 9 - 22
Select from the terms below:
A) Virus B) Bacteria
C) Cyanobacteria D) Both b & c
E) N.O.T
9. They are prokaryotes
10. They are eukaryotes
11. They are neither prokaryotes nor eukaryotes
12. They are neither living nor non-living
13. The smallest of these is
14. The smallest organism is
15. The smallest eukaryote is
16. The possess cell wall
17. They contain chlorophyll
18. They are autotrophes
19. AIDS is caused by
20. Tuberculosis (T.B) is caused by
21. Hepatitis is caused by:
22. Dengue is caused by
Biology MCQs: 3 Dr. Sajid Ali Talpur

4. 23. Viruses are composed of:
a) prokaryotic cell
b) nucleic acid + phospholipids
c) phospholipid + proteins
d) neucleic acid + protein
24. Cell membrane is composed of:
a) prokaryotic cell
b) nucleic acid + phospholipids
c) phospholipid + proteins
d) neucleic acid + protein
25. 1nm =?
a) 10-6
m b) 106
m
c) 10-9
m d) 109
m
26. The complex viruses have 2000 genes
a) true b) false
27. The average range size of virus is:
a) 10-100nm b) 20-250nm
c) 20mm d) 1-10mm
28. Bacteria are found every where on earth:
a) true b) false
29. Virus can not live outside the non-living body
a) true b) false
30. Bacilli are round or spherical shaped bacteria
a) true b) false
Biology MCQs: 4 Dr. Sajid Ali Talpur

5. 31. Straight chain cocci are called staphylococci.
a) true b) false
32. The autotrophic bacteria contain chloroplast
a) true b) false
33. Nitrogen fixation in cyanobacteria occurs in
heterocyst:
a) true b) false
34. The protein subunits in the capsid of virus are
called:
a) capsule b) capsomeres
c) genome d) capsers
35. Virus capsid contains:
a) DNA b) RNA
c) DNA & RNA d) DNA or RNA
Biology MCQs: 5 Dr. Sajid Ali Talpur

6. Answer Key
1 B 2 B 3 D
4 B 5 B 6 C
7 E 8 B 9 D
10 E 11 A 12 A
13 A 14 B 15 E
16 D 17 C 18 C
19 A 20 B 21 A
22 A 23 D 24 C
25 C 26 B 27 B
28 A 29 B 30 B
31 B 32 B 33 A
34 B 35 D
Biology MCQs: 6 Dr. Sajid Ali Talpur

7. Answer Key
1 B 2 B 3 D
4 B 5 B 6 C
7 E 8 B 9 D
10 E 11 A 12 A
13 A 14 B 15 E
16 D 17 C 18 C
19 A 20 B 21 A
22 A 23 D 24 C
25 C 26 B 27 B
28 A 29 B 30 B
31 B 32 B 33 A
34 B 35 D
Biology MCQs: 6 Dr. Sajid Ali Talpur