Cell : The Unit of life - Live Session - NEET 2020Contact Number: 9667591930 / 8527521718Cell : The Unit of life - Live Session - NEET 2020Contact Number: 9667591930 / 8527521718During Gram's staining which is incorrect?
1. All bacteria take crystal violet stain
2. Gram +ve bacteria take crystal violet stain
3. Only Gram -ve bacteria take crystal violet stain
4. Gram -ve bacteria lose this stain after alcohol
Which of the following are the largest constituent of a typical cell membrane and are also responsible for performing most of the functions of the membrane?
1. Proteins
2. Lipids
3. Glycolipids
4. Glycoproteins
Who concluded, based on his studies on plant tissues, that the presence of cell wall is a unique character of plant cells?
1. Mathias Schleiden
2. Theodor Schwann
3. Rudolph Virchow
4. Robert Hooke
Mesosomes in prokaryotes do not help in:
1. Cell wall formation
2. DNA replication
3. Respiration
4. Photosynthesis
If the centromere is situated close to the end of a chromosome, it is called as:
1. Metacentric
2. Submetacentric
3. Acrocentric
4. Telocentric
Centrioles, cilia, flagella, and basal bodies have remarkably similar structure elements and arrangements. This leads us to which of the following as a probable hypothesis?
1. Disruption of one of these types of structure should necessarily disrupt each of the others as well.
2. Loss of basal bodies should lead to loss of all cilia, flagella, and centrioles.
3. Motor proteins such as dynein must have evolved before aby of these four kinds of structure.
4. Natural selection for motility must select for microtubular arrays in circular patterns.
The presence of cholesterol in the plasma membranes of some animals
1. enables the membrane to stay fluid more easily when cell temperature drops.
2. enables the animals to remove hydrogen atoms from saturated phospholipids.
3. enables the animal to add hydrogen atoms to unsaturated phospholipids.
4. makes the membrane less flexible, allowing it to sustain greater pressure from within the cell.
Prokaryotic cells have something unique in the form of:
1. Inclusion bodies
2. Plasmids
3. Cell wall
4. 70 S ribosomes
Under which of the following conditions would you expect to find a cell with a predominance of free ribosomes?
1. a cell that is secreting proteins
2. a cell that is producing cytoplasmic enzymes
3. a cell that is constructing its cell wall or extracellular matrix
4. a cell that is digesting food particles
Chromatophores are:
1. present in liopolysaccharide layer of gram negative bacteria
2. colored pigments present in fluorescent bacteria
3. vesicles that store pigments in prokaryotic cells
4. extensions on membrane in cyanobacteria
Select the wrong statement.
| 1. | Bacterial cell wall is made up of peptidoglycan |
| 2. | Pili and fimbriae are mainly involved in motility of bacterial cells |
| 3. | Cyanobacteria lack flagellated cells |
| 4. | Mycoplasma is a wall-less microorganism |
Mitochondria and chloroplast are
I. semi-autonomous organelles.
II. formed by division of pre-existing organelles and they contain DNA but lack proteins synthesizing machinery.
Which one of the following options is correct?
1. II is true but I is false
2. I is true but II is false
3. Both I and II are false
4. Both I and II are correct
Which of the following statement is not true for cancer cells in relation to mutations?
1. Mutations destroy telomerase inhibitor
2. Mutations inactivate the cell control
3. Mutations inhibit production of telomerase
4. Mutations in proto-oncogenes accelerate the cell cycle
Balbiani rings are sites of
1. lipid synthesis
2. nucleotide synthesis
3. polysaccharide synthesis
4. RNA and protein synthesis
Cytochromes are found in
1. matrix of mitochondria
2. outer wall of mitochondria
3. cristae of mitochondria
4. lysosomes
The solid linear cytoskeletal elements having a diameter of 6nm and made up of single type of monomer are known as
1. microtubules
2. microfilaments
3. intermediate filaments
4. lamins
Ribosomal RNA in actively synthesized in
1. lysosomes
2. nucleolus
3. nucleoplasm
4. ribosomes
Which one of the following also act as a ribozyme in a bacterial cell?
1. snRNA
2. hn RNA
3. 23 S rRNA
4. 5 S rRNA
Stroma in the chloroplasts of higher plants contains
1. light-independent reaction enzymes
2. light-dependent reaction enzymes
3. ribosomes
4. chlorophyll
Keeping in view the 'fluid mosaic model for the structure of cell membrane, which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other (described as flip-flop movement)?
1. Both lipids and proteins can flip-flop
2. While lipids can rarely flip-flop, proteins cannot
3. While proteins can flip-flop, lipids cannot
4. Neither lipids, nor proteins can flip-flop
Which one of the following phenomena is commonly referred as 'cell drinking?
1. Endocytosis
2. Exocytosis
3. Phagocytosis
4. Pinocytosis
An organelle present in plant cells but absent from those of animals is
1. vacuole
2. peroxisome
3. glyoxysomes
4. Both 1 and 3
Which of the following is not a true subcellular organelle?
1. peroxisome
2. Ribosome
3. Chloroplast
4. Lysosome
Golgi body is associated with
1. packaging and storage of material
2. cell wall formation
3. transport of enzyme
4. all of the above
Extranuclear genes occurs in
1. plastids and are not inherited
2. plasmid and are not inherited
3. mitochondria and are inherited by female
4. mitochondria and are inherited by male
What is common between chloroplast chromoplasts and leucoplasts?
1. Presence of pigments
2. Possession of thylakoids and grana
3. Storage of starch, proteins and lipids
4. Ability to multiply by a fission-like process
The microscope usually used for seeing living cells or tissues is
1. compound microscope
2. electron microscope
3. phase contrast microscope
4. light microscope
Chromatin is made up of:
1. DNA and protein
2. DNA and histone
3. DNA, RNA, protein
4. RNA, histone and oil bodies.
Mitochondria and chloroplast are believed to be bacterial endosymbiont because
I. they have self nucleic acid i.e., circular ds, DNA and RNAs
II. 70s ribosomes
III. their membrane resembles that of bacteria, having four proteins.
IV. ETS and ATP forming machinery is present.
1. I and II
2. I, II and III
3. All of these
4. I and IV
If a biochemical analysis of mitochondria has to be done, the best procedure would be
1. select cells which have a larger number of mitochondria
2. plasmolyse the cell and filter out the mixture and take the debris
3. grind the cells and filter out the mixture and take the debris
4. subject the cell to cell fractionation (centrifuge) and obtain mitochondria
Which of the following statement is incorrect regarding the band region of polytene chromosome?
1. Feulgen negative area
2. Absorb ultraviolet light at
3. Chromonemata is tightly packed
4. Stain intensely with basic stain
The percentage of cell surface that is impenetrable for ions is
1. 1 %
2. 99.9 %
3. 90 %
4. 73 %
Who invented cell?
1. Anton Von Leeuwenhoek
2. Robert Brown
3. Robert Hooke
4. None of these
How many of the following cell organelles are membranous?
Endoplasmic reticulum, Nucleus, Lysosomes, vacuole, ribosomes, centrioles
1. 6
2. 5
3. 4
4. 2
How many of the following cell organelles are not present in prokaryotic cell?
Endoplasmic reticulum, Nucleus, lysosomes, vacuoles, ribosomes, centrioles
1. 6
2. 5
3. 4
4. 2
Which of the following is not true about plasmid
1. extra chromosomal DNA
2. give unique genotypic characters to bacteria
3. helps in antibiotic resistance
4. helps in reproduction
In membranes, the lipids are arranged within the membrane with the _____ heads towards the outer sides and the _____ tails towards the inner part.
1. Polar, charged
2. polar, hydrophobic
3. polar, nonpolar
4. Both 2 and 3
Which of the following biomolecules is not the part of membrane?
1. Nucleic Acid
2. Proteins
3. Lipids
4. Carbohydrates
Integral or Peripheral proteins classification is based on
1. protein size
2. ease of extraction
3. ease of function
4. ease of study
Lateral movement of which of the following biomolecules takes place within the overall bilayer
1. lipids
2. carbohydrates
3. proteins
4. Both 1 and 3
The common component between the cell wall of algae and plants is
1. cellulose
2. Hemicellulose
3. Both 1 and 2
4. Mannans
Which of the following is true about ribosome except
1. site of protein synthesis
2. universal cell organelle
3. 70s is present only in prokaryotes
4. 80s is present in eukaryotes
How many of the following structures are synthesised by microtubules?
Centrioles, basal body, cilia, flagella, spindle fibres
1. 5
2. 4
3. 3
4. 2
Which of the following is not the function of Golgi Body.
1. Glycosidation
2. Glycosylation
3. Translation
4. Post-translational modification
Materials to be packaged in the form of vesicles from the ER fuse with the ______ of the Golgi body and after packaging leaves from the ______ face.
1. cis, trans
2. trans, cis
3. convex, concave
4. Both 1 and 3
Which of the following is true about dictyosomes
1. Golgi body of plant
2. It helps in cell palte formation
3. It helps in formation of acrosome
4. All of these
Ergastoplasm is a modification of
1. RER
2. SER
3. GB
4. None of these
Which of the following is true about stroma except
1. contains enzymes for carbohydrates and proteins synthesis
2. Chlorophyll pigments are present in stroma
3. contains the most abundant protein of the universe
4. contains small, dsDNA molecules
Nucleus is absent in
1. erythrocytes of mammals
2. sieve tube cells of Vascular plants
3. Both 1 and 2
4. Companion cells of vascular bundle
Satellite body is formed in chromosome because of
1. primary constriction
2. secondary constriction
3. Centromere
4. Both 1 and 3