CBSE Class 11 Biology Cell The Unit of Life MCQs Set C

Question: Organelles can be separated from cell homogenate through
a) chromatography
b) X-rays diffraction
c) differential centrifugation
d) auto-radiography.
Answer: c

Question: Select the incorrect match.
a) Lampbrush – Diplotene bivalents chromosomes
b) Allosomes – Sex chromosomes
c) Sub-metacentric – L-shaped chromosomes chromosomes
d) Polytene – Oocytes of chromosomes amphibians
Answer: d

Question: Which of the following structures is not found in a prokaryotic cell?
a) Mesosome
b) Plasma membrane
c) Nuclear envelope
d) Ribosome
Answer: c

Question: Electron microscope has a high resolution power. This is due to
a) electromagnetic lenses
b) very low wavelength of electron beam
c) low wavelength of light source used
d) high numerical aperture of glass lenses used
Answer: b

Question: A major breakthrough in the studies of cells came with the development of electron microscope. This is because
a) the electron microscope is more powerful than the light microscope as it uses a beam of electrons which has wavelength much longer than that of photons
b) the resolving power of the electron microscope is much higher than that of the light microscope
c) the resolving power of the electron microscope is 200 – 350 nm as compared to 0.1 – 0.2 nm for the light microscope
d) electron beam can pass through thick materials, whereas light microscopy requires thin sections.
Answer: b

Question: Which one of the following cell organelles is enclosed by a single membrane?
a) Lysosomes
b) Nuclei
c) Mitochondria
d) Chloroplasts
Answer: a

Question: The concept of “Omnis cellula-e-cellula” regarding cell division was first proposed by
a) Aristotle
b) Rudolf Virchow
c) Theodore Schwann
d) Schleiden.
Answer: b

Question: The site of respiration in bacteria is
a) ribosome
b) microsome
c) episome
d) mesosome
Answer: d

Question: A cell organelle containing hydrolytic enzymes is
a) lysosome
b) microsome
c) ribosome
d) mesosome.
Answer: a

Question: Which is correct about cell theory in view of current status of our knowledge about cell structure?
a) It needs modification due to discovery of subcellular structures like chloroplasts and mitochondria.
b) Modified cell theory means that all living being are composed of cells capable of reproducing.
c) Cell theory does not hold good because all living beings (e.g., viruses) do not have cellular organisation.
d) Cell theory means that all living objects consists of cells whether or not capable of reproducing.
Answer: c

Question: Photosynthetic bacteria have pigments in
a) chromoplasts
b) chromatophores
c) leucoplasts
d) chloroplasts
Answer: b

Question: Angstrom (Å) is equal to
a) 0.01 mm
b) 0.001 mm
c) 0.0001 mm
d) 0.00001 mm.
Answer: c

Question: Which of the following statements about inclusion bodies is incorrect?
a) They are not bound by any membrane.
b) These are involved in ingestion of food particles.
c) They lie free in the cytoplasm.
d) These represent reserve material in cytoplasm.
Answer: b

Question: Chromosomes in a bacterial cell can be 1 – 3 in number and
a) are always circular
b) are always linear
c) can be either circular or linear, but never both within the same cell
d) can be circular as well as linear within the same cell.
Answer: a

Question: Select the wrong statement.
a) Bacterial cell wall is made up of peptidoglycan.
b) Pili and fimbriae are mainly involved in motility of bacterial cells.
c) Cyanobacteria lack flagellated cells.
d) Mycoplasma is a wall-less microorganism.
Answer: b

Question: The Golgi complex participates in
a) fatty acid breakdown
b) formation of secretory vesicles
c) respiration in bacteria
d) activation of amino acid.
Answer: b

Question: Which of the following events does not occur in rough endoplasmic reticulum?
a) Protein folding
b) Protein glycosylation
c) Cleavage of signal peptide
d) Phospholipid synthesis
Answer: d

Question: The structures that help some bacteria to attach to rocks and/or host tissues are
a) mesosomes
b) holdfast
c) rhizoids
d) fimbriae.
Answer: d

Question: Magnification of compound microscope is not connected with
a) numerical aperture
b) focal length of objective
c) focal length of eye piece
d) tube length.
Answer: a

Question: The motile bacteria are able to move by
a) fimbriae
b) flagella
c) cilia
d) pili.
Answer: b

Question: Why is a capsule advantageous to a bacterium?
a) It protects the bacterium from desiccation.
b) It provides means of locomotion.
c) It allows bacterium to “hide” from host’s immune system.
d) It allows the bacterium to attach to the surface.
Answer: a,c,d

Question: Names of Schleiden and Schwann are associated with
a) protoplasm as the physical basis of life
b) cell theory
c) theory of cell lineage
d) nucleus functions as control centre of cell
Answer: b

Question: Which of the following pairs of organelles does not contain DNA?
a) Nuclear envelope and Mitochondria
b) Mitochondria and Lysosome
c) Chloroplast and Vacuoles
d) Lysosomes and Vacuoles
Answer: d

Question: Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?
a) Ribosome
b) Chloroplast
c) Mitochondrion
d) Lysosome
Answer: c

Question: Which of the following is true for nucleolus?
a) Larger nucleoli are present in dividing cells.
b) It is a membrane-bound structure.
c) It takes part in spindle formation.
d) It is a site for active ribosomal RNA synthesis.
Answer: d

Question: Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells?
a) Endoplasmic reticulum
b) Peroxisomes
c) Golgi bodies
d) Polysomes
Answer: c

Question: Water soluble pigments found in plant cell vacuoles are
a) carotenoids
b) anthocyanins
c) xanthophylls
d) chlorophylls.
Answer: b

Question: A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should illuminate the object by which one of the following colours of ight so as to get the best possible resolution?
a) Blue
b) Green
c) Yellow
d) Red
Answer: a

Question: Cellular organelles with membranes are
a) endoplasmic reticulum, ribosomes and nuclei
b) lysosomes, Golgi apparatus and mitochondria
c) nuclei, ribosomes and mitochondria
d) chromosomes, ribosomes and endoplasmic reticulum.
Answer: b

Question: The term ‘glycocalyx’ is used for
a) a layer present between cell wall and membrane of bacteria
b) cell wall of bacteria
c) bacterial cell glyco-engineered to possess N-glycosylated proteins
d) a layer surrounding the cell wall of bacteria.
Answer: d

Question: Which of the following statements is not correct?
a) Lysosomes are formed by the process of packaging in the endoplasmic reticulum.
b) Lysosomes have numerous hydrolytic enzymes.
c) The hydrolytic enzymes of lysosomes are active under acidic pH.
d) Lysosomes are membrane-bound structures.
Answer: a

Question: Which of the following statements regarding mitochondria is incorrect?
a) Mitochondrial matrix contains single circular DNA molecule and ribosomes.
b) Outer membrane is permeable to monomers of carbohydrates, fats and proteins.
c) Enzymes of electron transport are embedded in outer membrane.
d) Inner membrane is convoluted with infoldings.
Answer: c

Question: Select the mismatch.
a) Gas vacuoles – Green bacteria
b) Large central vacuoles – Animal cells
c) Protists – Eukaryotes
d) Methanogens – Prokaryotes
Answer: b

Question: The shorter and longer arms of a submetacentric chromosome are referred to as
a) m-arm and n-arm respectively
b) s-arm and l-arm respectively
c) p-arm and q-arm respectively
d) q-arm and p-arm respectively.
Answer: c

Question: Microtubules are the constituents of
a) centrioles, spindle fibres and chromatin
b) centrosome, nucleosome and centrioles
c) cilia, flagella and peroxisomes
d) spindle fibres, centrioles and cilia.
Answer: d

Question: Which one of the following is not an inclusion body found in prokaryotes?
a) Glycogen granule
b) Polysome
c) Phosphate granule
d) Cyanophycean granule
Answer: d

Question: Which structures perform the function of mitochondria in bacteria?
a) Nucleoid
b) Ribosomes
c) Cell wall
d) Mesosomes
Answer: d

Question: Mitochondria and chloroplast are a) semi-autonomous organelles b) formed by division of pre-existing organelles and they contain DNA but lack protein synthesisingmachinery. Which one of the following options is correct?
a) a is true but b is false.
b) Both a and b are false.
c) Both a and b are correct.
d) b) is true but a is false.
Answer: a

Question: Match the columns and identify the correct option.
Column I                   Column II
A. Thylakoids          (i) Disc-shaped sacs in Golgi apparatus
B. Cristae               (ii) Condensed structure of DNA
C. Cisternae           (iii) Flat membranous sacs in stroma
D. Chromatin          (iv) Infoldings in mitochondria
a) A-(iii), B-(i), C-(iv), D-(ii)
b) A-(iii), B-(iv), C-(ii), D-(i)
c) A-(iv), B-(iii), C-(i), D-(ii)
d) A-(iii), B-(iv), C-(i), D-(ii)
Answer: d

Question: Match the column I with column II.
Column-I                                Column-II
A. Golgi apparatus         (i) Synthesis of protein
B. Lysosomes                (ii) Trap waste and excretory products
C. Vacuoles                   (iii) Formation of glycoproteins and glycolipids
D. Ribosomes               (iv) Digesting biomolecules
Choose the right match from options given below.
a) A-(iii), B-(iv), C-(ii), D-(i)
b) A-(iv), B-(iii), C-(i), D-(ii)
c) A-(iii), B-(ii), C-(iv), D-(i)
d) A-(i), B-(ii), C-(iv), D-(iii)
Answer: a