Basis of Life- Cells, Protoplasm and Tissues NDA Questions

NDA BIOLOGY

Basis of Life- Cells, Protoplasm and Tissues MCQ Questions


13.
Small circular extra-chromosomal DNA found in bacteria is called:
A.
Satellite DNA
B.
Nucleosome
C.
Plasmid
D.
Chromatin
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ANSWER :
C. Plasmid
14.
The mesosome in prokaryotes is:
A.
An infolding of the plasma membrane
B.
A type of ribosome
C.
The region containing genetic material
D.
A membrane-bound organelle for energy production
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ANSWER :
A. An infolding of the plasma membrane
15.
The cell envelope of bacteria consists of (from outside to inside):
A.
Glycocalyx → Plasma membrane → Cell wall
B.
Glycocalyx → Cell wall → Plasma membrane
C.
Cell wall → Glycocalyx → Plasma membrane
D.
Plasma membrane → Cell wall → Glycocalyx
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ANSWER :
B. Glycocalyx → Cell wall → Plasma membrane
16.
Bacteria that retain Gram stain are called Gram-positive because:
A.
They have a thicker peptidoglycan cell wall that retains crystal violet dye
B.
They lack a cell wall
C.
They are more harmful than gram-negative
D.
They have an outer membrane of lipopolysaccharide
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ANSWER :
A. They have a thicker peptidoglycan cell wall that retains crystal violet dye
17.
The flagellum of bacteria is composed of three parts. Which is the CORRECT sequence from outside to inside?
A.
Filament → Basal body → Hook
B.
Basal body → Hook → Filament
C.
Hook → Filament → Basal body
D.
Filament → Hook → Basal body
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ANSWER :
D. Filament → Hook → Basal body
18.
Pili and Fimbriae in bacteria:
A.
Help in motility like flagella
B.
Are found only in gram-positive bacteria
C.
Do not play a role in motility but help in attachment
D.
Are used for protein synthesis
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ANSWER :
C. Do not play a role in motility but help in attachment