Bacteria MCQ and Answers: How well do you know about bacteria? Take this set of MCQs on the topic of bacteria and try to figure out what’s right or wrong. This MCQs & answers sheet on Bacteriology and Microbiology was designed for students preparing for NEET (National Eligibility Entrance Test). The questions were based on the Bacteria chapter from NCERT science textbook class XI by the CBSE board.
Bacteria MCQ and Answers
1. What is sarcinae?
a) Cocci group of bacteria
b) Chainlike group of bacteria
c) Cubelike group of bacteria
d) Grapelike cluster of bacteria
Answer: Cubelike group of bacteria
2. Differential staining of bacteria on Gram staining is due to
a) difference in the cell wall layer components of Gram positive and Gram negative bacteria
b) difference in the cell structure of Gram positive and Gram negative bacteria
c) difference in the mode of nutrition of Gram positive and Gram negative bacteria
d) none of the above
Answer: difference in the cell wall layer components of Gram positive and Gram negative bacteria
3. The iodine used in Gram staining serves as a
a) chelator
b) catalyst
c) mordant
d) cofactor
Answer: mordant
4. Which among the following is called filamentous bacteria
a) Mycoplasmas
b) Spirochetes
c) Actinomycetes
d) Vibrios
Answer: Actinomycetes
5. Which of the following group of bacteria is considered as a link between bacteria and virus
a) Mycoplasmas
b) Spirochaetes
c) Actinomycetes
d) Vibrios
Answer: Mycoplasmas
6. Cork-screw shaped forms of bacteria are
a) bacilli
b) stalked bacteria
c) spirochaetes
d) actinomycetes
Answer: spirochaetes
7. The ability of bacteria to change their morphological form frequently is termed as
a) lysogeny
b) pleomorphism
c) alteromorphism
d) none of these
Answer: pleomorphism
8. Bacterial cell wall is made up of
a) chitin
b) cellulose
c) dextran
d) peptidoglycan
Answer: peptidoglycan
9. Bacterial flagella are made up of
a) microtubules
b) tubulin
c) flagellin
d) spinin
Answer: flagellin
10. Surface appendage of bacteria meant for cell-cell attachment during conjugation is
a) pili
b) flagella
c) spinae
d) cilia
Answer: pili
11. Spinae is rigid tubular appendages in
a) Gram positive bacteria
b) Gram negative bacteria
c) both a and b
d) actinomycetes
Answer: Gram positive bacteria
12. The region where bacterial genome resides is termed as
a) nucleus
b) cytoplasm
c) nucleoid
d) ribosome free region
Answer: nucleoid
13. Bacterial chromosome is
a) single stranded and circular
b) double stranded and circular
c) single stranded and linear
d) double stranded and linear
Answer: double stranded and circular
14. Extra chromosomal, circular, double stranded, self-replicating DNA molecule in bacteria is called
a) cosmid
b) plasmid
c) phagemid
d) phasmid
Answer: plasmid
15. Membraneous infolding in bacteria that initiate DNA replication is
a) mesosomes
b) carboxysome
c) magnetosome
d) nulcleosome
Answer: mesosomes
16. Mark the common feature between eukaryotes and prokaryotes.
a) Shape of DNA
b) Number of chromosomes
c) A prokaryotic cell is similar to a eukaryotic organelle
d) Cell wall
Answer: A prokaryotic cell is similar to a eukaryotic organelle
17. Which of the following gene deduced the evolutionary relationship between the taxonomic
groups?
a) 16S rRNA
b) 23S rRNA
c) 5S rRNA
d) 18S rRNA
Answer: 16S rRNA
18. Name the scientist who proposed the phylogenetic tree for living things.
a) Carlo Urbani
b) Louis Pasteur
c) Robert Koch
d) Carl Woese
Answer: Carl Woese
19. The largest bacteria which can be visible by the unaided eye is_______
a) Thiomargarita namibiensis
b) Lactobacillus
c) Mycoplasma
d) Pseudomonas
Answer: Thiomargarita namibiensis
20. Which of the following is NOT the basic shape of the bacteria?
a) Rod shape
b) Square shape
c) Comma shape
d) Spiral shape
Answer: Square shape