CBSE Class 11 Biology Cell The Unit of Life MCQs Set 05

Question: Both the membranes of mitochondrion are
a) structurally different but functionally similar.
b) structurally as well as functionally different.
c) structurally similar but functionally different.
d) structurally different but functionally similar.
Answer: b

Question: Chromosomes having equal or almost equal arms are called
a) metacentric
b) acrocentric
c) polycentric
d) acentric
Answer: a

Question: In which method of transport, plasma membrane does not require carrier molecule?
a) Active transport
b) Facilitated diffusion
c) Simple diffusion
d) Na⁺ – K⁺ pump
Answer: c

Question: Microtubules, motor proteins, and actin filaments are all part of the
a) mechanism of photosynthesis that occurs in chloroplasts.
b) rough ER in prokaryotic cells.
c) cytoskeleton of eukaryotic cells.
d) process that moves small molecules across cell membranes.
Answer: c

Question: pH of vacuolar cell sap is
a) neutral and isotonic.
b) alkaline and isotonic.
c) acidic and hypertonic.
d) equal to cytoplasm and isotonic.
Answer: c

Question: In prokaryotes, chromatophores are
a) specialized granules responsible for colouration of cells.
b) structures responsible for organizing the shape of the organism.
c) inclusion bodies lying free inside the cells for carrying out various metabolic activities.
d) internal membrane system which becomes extensive and complex in photosynthetic bacteria.
Answer: d

Question: You are asked to examine a cell using a powerful light microscope. The image you see has a clearly defined nucleus and mitochondria. It also has a large central vacuole and chloroplasts. From what group of organisms did this cell most likely come?
a) Bacteria
b) Protists
c) Fungi
d) Plants
Answer: d

Question: Which of the following statements are correct?
a) Na⁺/K⁺ pump is an example of active transport.
b) In plant cells lipid like steroidal hormones are synthesized in SER.
c) In plant cells, the vacuoles can occupy up to 10% of the volume of the cell.
d) Chlorophyll and leucoplast are responsible for trapping light energy essential for photosynthesis.
Answer: a

Question: Which of the following is incorrect?
a) Mycoplasma is the smallest cell (0.3 μ).
b) Bacteria are 3 to 5 μm in size.
c) The largest cell is the egg of an ostrich.
d) Nerve cells are some of the smallest cells.
Answer: d

Question: A component of cytoskeleton is
a) microtubule
b) bone
c) chitin
d) cartilage
Answer: a

Question: The main organelle involved in modification and routing of newly synthesized proteins to their destinations is
a) chloroplast
b) mitochondria
c) lysosome
d) endoplasmic reticulum
Answer: d

Question: Select the incorrect statement about prokaryotic ribosomes.
a) 50S and 30S subunits unite to form 70S ribosomes.
b) Polysome/polyribosome consists of many ribosomes only.
c) Ribosome is the site of protein synthesis.
d) Polysome indicate the synthesis of identical polypeptide in multiple copies.
Answer: b

Question: According to widely accepted “fluid mosaic model” cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statements is incorrect?
a) Proteins in cell membranes can travel within the lipid bilayer.
b) Proteins can also undergo flip-flop movements in the lipid bilayer.
c) Proteins can remain confined within certain domains of the membrane.
d) Many proteins remain completely embedded within the lipid bilayer.
Answer: b

Question: The best way to identify a cell as either prokaryotic or eukaryotic is to determine whether
a) it came from a single-celled or multicellular organism.
b) it has a nucleus.
c) it has a plasma membrane.
d) it has cytosol.
Answer: a

Question: Plastids storing fat are called
a) Elaioplasts
b) Sphaerosomes
c) Aleuroplasts
d) Pyrenoids
Answer: a

Question: Microtubules are absent in
a) mitochondria
b) centriole
c) flagella
d) spindle fibres
Answer: a

Question: Protein synthesis in an animal cell occurs
a) on ribosomes present in cytoplasm as well as in mitochondria.
b) on ribosomes present in the nucleolus as well as in cytoplasm.
c) only on ribosomes attached to the nuclear envelope and endoplasmic reticulum.
d) only on the ribosomes present in cytosol.
Answer: a

Question: Which of the following statement is correct regarding vacuole?
a) It is membrane-bound and contains storage proteins and lipids.
b) It is membrane-bound and contains water and excretory substances.
c) It lacks membrane and contains air.
d) It lacks membrane and contains water and excretory substances.
Answer: b

Question: The cytoskeleton is a proteinaceous network of fibres in the cytoplasm. It is involved in
a) mechanical support.
b) motility.
c) maintenance of cell-shape.
d) all of these
Answer: d

Question: Read the folowing statements and identify the correct option.
(i) Contractile vacuole takes part in osmoregulation and excretion.
(ii) Food vacuole is formed by engulfing the food particles.
(iii) The vacuole is bound by a double membrane called tonoplast.
(iv) Vacuole can occupy upto 90 percent of the volume of the cell.
(a) (i) and (ii)
(b) (ii) and (iv)
(c) (i), (ii) and (iv)
(d) None of the above
Answer: c

Question: Which of the following statements are correct ?
(i) In prokaryotic cells, a special membranous structure formed by the extension of the plasma membrane into the cell is known as polysome.
(ii) The smooth endoplasmic reticulum is the major site for synthesis of glycoproteins.
(iii) RuBisCO is the most abundant protein in the whole biosphere.
(iv) Mitochondria, chloroplasts and peroxisomes are not considered as part of endomembrane system.
Of the above statements
(a) (iii) and (iv)
(b) (i) and (ii)
(c) (ii) and (iii)
(d) (i) and (iv)
Answer: a

Question: Study the following statements on cilium or flagellum and answer the question.
(i) Cilium / Flagellum contains an outer ring of nine doublet microtubules surrounding two singlet microtubules.
(ii) Cilia are smaller which work like oars, causing the movement of either the cells or surrounding fluid.
(iii) Flagella are comparatively longer and responsible for cell movement.
(iv) Cilium and flagellum are covered with plasma membrane.
Which of the above statements are correct?
(a) (i) and (ii)
(b) (i), (ii), (iii) and (iv)
(c) (i) and (iv)
(d) (ii) and (iii)
Answer: b

Question: Which of the following statements are incorrect ?
(i) Plant cells have centrioles which are absent in almost all animal cells.
(ii) Ribosomes are the site of protein synthesis.
(iii) The middle lamella is a layer mainly of calcium carbonate which holds the different neighbouring cells together.
(iv) In animal cell, steroidal hormones are synthesized by smooth endoplasmic reticulum.
Of the above statements
(a) (i) and (iii)
(b) (iii) and (iv)
(c) (ii) and (iv)
(d) (i) and (iv)
Answer: a

Question: Which of the following statements is/are correct ?
(i) The shape of the cells may vary with the function they perform.
(ii) Human RBC is about 7.0 mm in diameter.
(iii) Cytoplasm is the main area of cellular activities.
(iv) Various chemical reactions occur in cytoplasm to keep the cell in the living state.
(a) (i), (ii), (iii) and (iv)
(b) Only (i) and (ii)
(c) Only (iv)
(d) None of the above
Answer: a

Question: Which of the following is not the function of cell wall?
(i) Provides shape to the cell.
(ii) Protects the cell from mechanical damage and infection.
(iii) Helps in cell to cell interaction.
(iv) Provides barrier to undesirable macromolecules.
(a) Only (i)
(b) Only (iv)
(c) Only (ii), (iii) and (iv)
(d) None of the above
Answer: d

Question: Given below are some characters of a cell organelle.
Identify the correct organelle which shows all the characters described above.
(i) It is a membrane bound space found in the cytoplasm.
(ii) It is bound by a single membrane called tonoplast.
(iii) It contains water, sap, excretory products and other materials not useful to the cell.
(iv) It has higher concentration of sap than the cytoplasm.
(a) Golgi apparatus
(b) Lysosomes
(c) Endoplasmic reticulum
(d) Vacuoles
Answer: d

Question: Read the statements given below with regard to the functions performed by Golgi apparatus ?
(i) Transport and chemically modify the materials contained within it.
(ii) Performs the function of packaging materials.
(iii) Important site of formation of glycoproteins and glycolipids.
Which of the following is the correct answer ?
(a) (i) is wrong but (ii) and (iii) are correct
(b) (ii) is wrong but (i) and (iii) are correct
(c) (ii) and (iii) are wrong but (i) is correct
(d) All are correct.
Answer: d

Question: Select the statements which are related to Schwann.
(i) He reported that cells have a thin outer layer which is today known as plasma membrane
(ii) Cell wall is a unique character of the plant cell.
(iii) Body of plants and animals are composed of cells and products of cells.
(a) Only (i)
(b) Only (iii)
(c) (i) and (iii)
(d) All of these
Answer: d

Question: Choose the wrong statements regarding bacterial cell
(i) Glycocalyx is the outermost envelope in bacteria.
(ii) The glycocalyx could be a loose sheath called capsule.
(iii) The glycocalyx may be thick and tough called slime layer.
(iv) A special structure formed by the plasma membrane is called mesosome.
(v) Small bristle like fibres sprouting out of the cell are called fimbriae.
(a) (i) and (iii)
(b) (i) and (ii)
(c) (ii) and (iii)
(d) (i) and (iv)
Answer: c

Question: Which of the following statement of a bacterial cell is/ are correct?
(i) Mesosome is formed by the extensions of plasma membrane into the cell.
(ii) The pili are elongated tubular structures made up of a protein.
(iii) Flagellum is composed of filament, hook and basal body.
(iv) Ribosomes are about 30 nm by 50 nm in size.
(a) (i), (ii) and (iii)
(b) All of the above
(c) (ii) and (iv)
(d) None of the above
Answer: a

Question: Which of the following statements is/are correct ?
(i) The endomembrane system includes plasma membrane, ER, Golgi complex, lysosomes and vacuoles.
(ii) ER helps in the transport of substances, synthesis of proteins, lipoproteins and glycogen.
(iii) Ribosomes are involved in protein synthesis.
(iv) Mitochondria help in oxidative phosphorylation and generation of ATP.
(a) (ii), (iii) & (iv)
(b) (i) only
(c) (ii) only
(d) (iii) only
Answer: a

Question: Consider the following statements and choose the correct statement.
(i) The endomembrane system includes mitochondria, chloroplast and peroxisomes.
(ii) Smooth endoplasmic reticulum is the major site for synthesis of lipid.
(iii) Rough endoplasmic reticulum is actively involved in protein synthesis.
(iv) Mitochondrial matrix possesses single circular DNA, a few RNA and 80S ribosomes.
Of the above statements.
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (iii) and (iv)
(d) (ii) and (iii)
Answer: d