Cell the Unit of Life MCQs | Cell the Unit of Life Objective Type Questions with Answers

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Questions
1 Pick the correct statement from these regarding the cell membrane
A Lipids are arranged in a bilayer with polar heads towards the inner part
B Na+ and K+ ions move across cell membrane by passive transport
C Fluid mosaic model of the cell membrane was proposed by Singer and Nicolson
D Proteins make up 60-70% of cell membrane

Answer:Fluid mosaic model of the cell membrane was proposed by Singer and Nicolson
2 This structure between two adjacent cells is an effective transport pathway
A Plasmalemma
B Plastoquinones
C Plasmodesmata
D Endoplasmic reticulum

Answer: Plasmodesmata
3 Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on
A proton gradient
B accumulation of Na ions
C accumulation of K ions
D membrane potential

Answer:proton gradient
4 The telomeres of eukaryotic chromosomes consist of short sequences of
A guanine rich repeats
B thymine rich repeats
C cytosine rich repeats
D adenine rich repeats

Answer:guanine rich repeats
5 Cellular totipotency is demonstrated by
A only bacterial cells
B all eukaryotic cells
C all plant cells
D only gymnosperm cells

Answer: all plant cells
6 This ribosome is engaged in protein synthesis in animal cell
A Ribosomes of only cytosol
B Ribosomes which occur on nuclear membrane and ER
C Ribosomes of only mitochondria and cytosol
D Ribosomes of only nucleolus and cytosol

Answer: Ribosomes which occur on nuclear membrane and ER
7 This statement on cilia is incorrect
A Microtubules of cilia are composed of tubulin
B The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane
C Cilia contains an outer ring of nine doublet microtubules surrounding two singlet microtubules
D Cilia are hair-like cellular appendages

Answer: The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane
8 According to fluid mosaic model, plasma membrane is composed of
A phospholipids and oligosaccharides
B phospholipids and hemicellulose
C phospholipids and intergral proteins
D phospholipids, extrinsic proteins and intrinsic proteins

Answer:phospholipids, extrinsic proteins and intrinsic proteins
9 A bivalent consists of
A two chromatids and one centromere
B two chromatids and two centromeres
C four chromatids and two centromweres
D four chromatids and four centromeres

Answer: four chromatids and two centromweres
10 Additional of new cell wall particles amongst the existing ones is
A deposition
B apposition
C aggregation
D intussusception

Answer: intussusception
11 Experiments on Acetabularia by Hammerling proved ones is
A cytoplasm in controlling differentiation
B nucleus in heredity
C chromosomes in heredity
D nucleus cytoplasmic ratio

Answer: nucleus in heredity
12 Which is correct about cell theory in view of current status of our knowledge about cell structure
A cell theory means that all living objects consissts of cells wheather or not capable of reproducing
B it needs modification due to discovery of subcellular structures like chrorplasts and mitochondria
C cell theory does not hold good because all living beings( eg., viruses) do not have capable of reproducing
D modified cell theory means that all living beings are composed of cells capable of reproducing

Answer: cell theory does not hold good because all living beings( eg., viruses) do not have capable of reproducing
13 Golgi apparatus is absent in
A higher plants
B yeast
C bacteria and blue green algae
D none of the above

Answer: higher plants
14 In plant cells, peroxisomes are associated with
A photorespiration
B phototropism
C photoperiodism
D photosynthesis

Answer: photorespiration
15 Balbiani rings (puffs) are sites of
A DNA replication
B RNA and protein synthesis
C synthesis of lipids
D synthesis of polysaccharides

Answer: RNA and protein synthesis
16 The prokaryotic flagella possess
A unit membrane enclosed fibre
B protein membrane enclosed fibre
C 9+2 membrane enclosed fibre
D helically arranged protein molecule

Answer:helically arranged protein molecule
17 The mechanism of ATP formation both in chloroplasts and mitochondria is explained by
A chemiosmotic theory
B Munch's hypothesis (mass flow model)
C relay pump theory of Godlewski
D Cholodny Wont's model

Answer: Cholodny Wont's model
18 Select the mismatch:
A Gas vacuoles – Green Bacteria
B Large central vacuoles – Animal cells
C Protists – Eukaryotes
D Methanogens – Prokaryotes

Answer:Large central vacuoles – Animal cells
19 A cell organelle containing hydrolytic enzymes is
A Lysosome
B Microsome
C Ribosome
D Mesosome

Answer: Lysosome
20 Water soluble pigments found in plant cell vacuoles are
A Anthocyanin
B Xanthophyll
C Chlorophyll
D Carotenoids

Answer: Anthocyanin

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