Question. In fluid mosaic model of plasma membrane
(a) upper layer is non-polar and hydrophilic
(b) upper layer is polar and hydrophobic
(c) phospholipids form a bimolecular layer in middle part
(d) proteins form a middle layer.
Answer
C
Question. Element necessary for the middle lamella is
(a) Ca
(b) Zn
(c) K
(d) Cu.
Answer
A
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 odified 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 omains of the membrane.
(d) Many proteins remain completely embedded within the lipid bilayer.
Answer
B
Question. Centromere is required for
(a) movement of chromosomes towards poles
(b) cytoplasmic cleavage
(c) crossing over
(d) transcription.
Answer
A
Question. Microtubules are absent in
(a) mitochondria
(b) flagella
(c) spindle fibres
(d) centrioles.
Answer
A
Question. Lysosome contains
(a) oxidative enzymes
(b) hydrolytic enzymes
(c) reductive enzymes
(d) anabolic enzymes.
Answer
B
Question. Which cell organelle is concerned with glycosylation of protein?
(a) Ribosome
(b) Peroxisome
(c) Endoplasmic reticulum
(d) Mitochondria
Answer
C
Question. Which of the following organelles has single membrane?
(a) Mitochondria
(b) Spherosomes
(c) Nucleus
(d) Cell wall
Answer
B
Question. The proteins are synthesised at
(a) centrosomes
(b) Golgi bodies
(c) ribosomes
(d) mitochondria.
Answer
C
Question. Lysosomes are rich in
(a) nucleic acids
(b) hydrolytic enzymes
(c) carbohydrates
(d) hormones.
Answer
B
Question. The desmosomes are concerned with
(a) cell division
(b) cell adherence
(c) cytolysis
(d) cellular excretion.
Answer
B
Question. Which of the following ribosomes are engaged in protein synthesis in animal cell?
(a) Ribosomes which occur on nuclear membrane and ER
(b) Ribosomes of only cytosol
(c) Ribosomes of only nucleolus and cytosol
(d) Ribosomes of only mitochondria and cytosol
Answer
A
Question. Function of telomeres in nucleus is
(a) poleward movement
(b) to initiate the RNA synthesis
(c) to seal the ends of chromosome
(d) to recognise the homologous chromosome.
Answer
C
Question. Which of the following organelles contain enzymes that have digestive action?
(a) Ribosomes
(b) Polysomes
(c) Plastids
(d) Lysosomes
Answer
D
Question. In mitochondria, cristae act as sites for
(a) protein synthesis
(b) phosphorylation of flavoproteins
(c) breakdown of macromolecules
(d) oxidation-reduction reaction.
Answer
D
Question. Centromere is required for
(a) replication of DNA
(b) chromosome segregation
(c) poleward movement of chromosomes
(d) cytoplasmic cleavage.
Answer
C
Question. Which one of the following organelles is located near the nucleus and contains a collection of flattened membrane bound cisternae?
(a) Nucleolus
(b) Mitochondrion
(c) Centriole
(d) Golgi apparatus
Answer
D
Question. The inner membrane of the mitochondria is, usually, highly convoluted forming a series of infoldings known as
(a) thylakoids
(b) lamellae
(c) cristae
(d) grana.
Answer
C
Question. Besides giving out secretory vesicles, the Golgi apparatus is also concerned with the formation of
(a) lysosomes
(b) plastids
(c) grana of chloroplasts
(d) cell plates after cell division in plants.
Answer
A
Question. Active and passive transports across cell membrane differ in
(a) passive transport is nonselective
(b) passive transport is along the concentration gradient while active transport is due to metabolic energy
(c) active transport is more rapid
(d) passive transport is confined to anions while active transport is confined to cations.
Answer
B
Question. Membranous bag with hydrolytic enzymes which is used for controlling intracellular digestion of macromolecules is
(a) endoplasmic reticulum
(b) nucleosome
(c) lysosome
(d) phagosome.
Answer
C
Question. Golgi apparatus is absent in
(a) higher plants
(b) yeast
(c) bacteria and blue-green algae
(d) none.
Answer
C
Question. Cell recognition and adhesion occur due to biochemicals of cell membranes named
(a) proteins
(b) lipids
(c) proteins and lipids
(d) glycoproteins and glycolipids.
Answer
D
Question. In salivary gland chromosomes/polytene chromosomes, pairing is
(a) absent
(b) occasional
(c) formed between non-homologous chromosomes
(d) formed between homologous chromosomes.
Answer
D
Question. Balbiani rings (puffs) are sites of
(a) DNA replication
(b) RNA and protein synthesis
(c) synthesis of polysaccharides
(d) synthesis of lipids.
Answer
B
Question. In plant cells, peroxisomes are associated with
(a) photorespiration
(b) phototropism
(c) photoperiodism
(d) photosynthesis.
Answer
A
Question. All types of plastids possess essentially the same structure because they
(a) perform the same function
(b) store food materials like starch, fat and protein
(c) occur in aerial parts
(d) can transform from one form to another.
Answer
D
Question. Experiments on Acetabularia by Hammerling proved the role of
(a) cytoplasm in controlling differentiation
(b) nucleus in heredity
(c) chromosomes in heredity
(d) nucleo-cytoplasmic ratio.
Answer
B
Question. All plastids have similar structure because they can
(a) store starch, lipids and proteins
(b) get transformed from one type to another
(c) perform same function
(d) be present together.
Answer
B
Question. Oxysomes or F0 – F1 particles occur on
(a) thylakoids
(b) mitochondrial surface
(c) inner mitochondrial membrane
(d) chloroplast surface.
Answer
C
Question. Ribosomes are the centre for
(a) respiration
(b) photosynthesis
(c) protein synthesis
(d) fat synthesis.
Answer
C
Question. Which is distributed more widely in a cell?
(a) DNA
(b) RNA
(c) Chloroplasts
(d) Sphaerosomes
Answer
B
Question. Which one is apparato reticolare?
(a) Golgi apparatus
(b) Endoplasmic reticulum
(c) Microfilaments
(d) Microtubules
Answer
A
Question. An outer covering membrane is absent over
(a) nucleolus
(b) lysosome
(c) mitochondrion
(d) plastid.
Answer
A
Question. According to fluid mosaic model, plasma membrane is composed of
(a) phospholipids and oligosaccharides
(b) phospholipids and hemicellulose
(c) phospholipids and integral proteins
(d) phospholipids, extrinsic proteins and intrinsic proteins.
Answer
D
Question. Fluid mosaic model of cell membrane was put forward by
(a) Danielli and Davson
(b) Singer and Nicolson
(c) Garner and Allard
(d) Watson and Crick.
Answer
B
Question. Hammerling’s experiments of Acetabularia involved exchanging
(a) cytoplasm
(b) nucleus
(c) rhizoid and stalk
(d) gametes.
Answer
C
Question. The latest model for plasma membrane is
(a) lamellar model
(b) unit membrane model
(c) fluid mosaic model
(d) molecular lipid model.
Answer
C
Question. Nucleoproteins are synthesised in
(a) nucleoplasm
(b) nuclear envelope
(c) nucleolus
(d) cytoplasm.
Answer
D
Question. Polyribosomes are aggregates of
(a) ribosomes and rRNA
(b) only rRNA
(c) peroxisomes
(d) several ribosomes held together by string of mRNA.
Answer
D
Question. Plasma membrane is made of
(a) proteins and carbohydrates
(b) proteins and lipids
(c) proteins, lipids and carbohydrates
(d) proteins, some nucleic acid and lipids.
Answer
C
Question. Acetabularia used in Hammerling’s nucleocytoplasmic experiments is
(a) unicellular fungus
(b) multicellular fungus
(c) unicellular uninucleate green algae
(d) unicellular multinucleate green algae.
Answer
C
Question. Addition of new cell wall particles amongst the existing ones is
(a) deposition
(b) apposition
(c) intussusception
(d) aggregation.
Answer
C
Question. Cell wall shows
(a) complete permeability
(b) semipermeability
(c) differential permeability
(d) impermeability.
Answer
A
Question. Ribosomes were discovered by
(a) Golgi
(b) Porter
(c) de Robertis
(d) Palade.
Answer
D
