WorksheetsCell the unit of Life
Total questions: 20
Worksheet time: 10mins
With reference to Gram staining, select the correct statement
Primary stain used is safranin
Crystal violet is used as Mordant
Primary stain is Crystal violet
The bacterial smear observed blue in the microscope is gram negative
The prokaryotic ribosomes,
can be affected by action of RNases
are found as free floating in cytoplasm
are composed of 50S and 30S
All of the above
Which of the following cannot be attributed as a role of cytoskeleton?
Formation of pseudopodia
Formation of spindle fibers
maintenance of cell structure
Inhibits cylosis
Which of the following statements is not true with respect to semi-autonomous organelle observed in plants and animals both
It has gel like material inside the inner membrane known as stroma
It has stacked structure of thylakoids known as Grana
It has appressed and non-appresed regions in grana
All of the above
Microfilaments are composed mainly of a protein called
Lamins
Contractile protein actin
Non-contractile protein actin
Tubulin
The components of the cells forming endomembrane system is /are
Endoplasmic reticulum
Golgi complex
Lysosomes and vacuoles
All of these
Naked DNA found in the cytoplasm of prokaryotic cells is
Nucleoid
Prochromosome
Genophore
All of these
Golgi complex is absent in
Sperms of bryophytes
Sieve tubes of plants
Matured RBCs of mammals
All of these
The cristae in mitochondria bear
Elementary particles
F0 – F1 particles
Oxysomes
All of these
___________ are self-replicating, extra chromosomal segments of double stranded circular and naked DNA, present in a bacterial cell.
Plasmids
Nucleoid
Mesosomes
Bacteriophages
Mesosomes are the infoldings of cell membrane, which
(i) are present in both prokaryotic and eukaryotic cells
(ii) help in cell wall formation, DNA replication and respiration
(iii) increase the surface area of plasma membrane.
(i) and (ii)
(ii) and (iii)
(i) and (iii)
(i), (ii) and (iii)
A phospholipid molecule is amphipathic and produces two layers coming in contact with H2O. The head of phospholipid molecule is
at an angle of 40 °
at the outer surface
on the inner side
embedded in protein molecules
Cell membrane is selective permeable. This means that it
allows all materials to pass through
allows only water to pass through
allows only certain materials to pass through
allows only ions to pass through.
Continuity of cytoplasm from cell to cell is maintained through cytoplasmic connections in plants called
ER
tight junction
gap junction
plasmodesmata
Which of the following represents the features of lysosomes?
A lower pH than the cytoplasm
Reduced hydrolase activity
Double membrane envelope
All of these
Extranuclear inheritance is due to the presence of genes in
mitochondria and chloroplasts
nucleus and mitochondria
nucleus and chloroplasts
endoplasmic reticulum and mitochondria
Which of the following statements is incorrect for Centrioles?
Both the centrioles in a centrosome lie perpendicular to each other.
Central proteinaceous hub is missing in a centriole.
Each centriole has an organisation like that of a cartwheel.
Centrosome usually contains 2 cylindrical centrioles.
Select the wrong statement with respect to the structure of a plant cell.
Cellulosic cell wall is present inside the cell membrane.
Centrioles are usually absent.
A large central vacuole is present.
Golgi apparatus is formed of a member of unconnected units called dictyosomes.
The chromosome in which centromere lies slightly away from the middle of the chromosome resulting into one shorter arm and one longer arm, is called as
metacentric
submetacentric
acrocentric
telocentric
Assertion : Peripheral proteins are partially or totally buried in the membrane.
Reason :Integral proteins lie on the surface of membrane.
Both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
Both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
Assertion is true but Reason is false.
Both Assertion and Reason are false
