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Free download in PDF Cell the Unit of Life Objective Type Questions with Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
(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
(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
(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
(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
(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
(14)
In plant cells, peroxisomes are associated with
[A]
photorespiration
[B]
phototropism
[C]
photoperiodism
[D]
photosynthesis
(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
(20)
Water soluble pigments found in plant cell vacuoles are
[A]
Anthocyanin
[B]
Xanthophyll
[C]
Chlorophyll
[D]
Carotenoids
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