Cell : Unit of Life - Live Session - 24 August 2020Contact Number: 8527521718Cell : Unit of Life - Live Session - 24 August 2020Contact Number: 8527521718During Grams' 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
A non-membrane bound organelle found exclusively in animal cells is:
1. Sphaerosome
2. Glyoxisome
3. Peroxisome
4. Centriole
Cell is the fundamental structural and functional unit of all living organisms because:
| 1. | Anything less than a complete structure of a cell does not ensure independent living. |
| 2. | The metabolic reactions can only occur inside a living cell. |
| 3. | Nucleic acids present in the cells ensure living state. |
| 4. | The membrane bound organelles cause differentiation for proper functioning. |
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 |
The cis and trans faces of the Golgi Apparatus are:
1. Similar but not interconnected
2. Similar and interconnected
3. Entirely different but interconnected
4. Entirely different and not interconnected
A centriole-like structure, from which the cilium and the flagellum emerge, is the:
1. Centrosome
2. Basal body
3. Axoneme
4. Vimentin
The outer membrane of the nucleus:
I. is continuous with the Endoplasmic reticulum
II. does not bear ribosomes.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
If the centromere is situated close to the end of a chromosome, it is called as:
1. Metacentric
2. Submetacentric
3. Acrocentric
4. Telocentric
Gas vacuoles allow cyanobacteria to:
1. Store carbon dioxide for assimilation
2. Control their buoyancy
3. Provide anaerobic conditions to nitrogenase
4. Eliminate toxic ammonia
The lipid component of the plasma membrane mainly consists of:
1. Triglycerides
2. Cholesterol
3. Phosphoglycerides
4 Proteins
Carotenoid pigments are found in:
I. Chloroplasts
II. Chromoplasts
III. Leucoplasts
1. Only I
2. Only I and II
3. Only II
4. I, II and III
Microbodies, which help to convert stored lipids into carbohydrates so they can be used for plant growth, are known as:
1. Peroxisomes
2. Sphaerosomes
3. Glyoxysomes
4. Lysosomes
Ribosomes are produced in
1. Nucleolus
2. Mitochondria
3. Cytoplasm
4. Golgibody
The tail of the phospholipid molecule:
| 1. | is hydrophilic and composed of phosphate |
| 2. | is hydrophilic and composed of saturated hydrocarbons |
| 3. | is hydrophobic and composed of saturated hydrocarbons |
| 4. | is hydrophobic and composed of unsaturated hydrocarbons |
Unless specifically stained by a vital stain like Janus Green, which of the following will not be visible under a microscope?
1. Rough endoplasmic reticulum
2. Smooth endoplasmic reticulum
3. Golgi apparatus
4. Mitochondria
The two types of cellular organelles that transform energy are:
1. Chromoplasts and Leucoplasts
2. Mitochondria and Chloroplasts
3. Mitochondria and Endoplasmic reticulum
4. Chloroplasts and Golgi apparatus
The arrangement of outer and central microtubules in a cilium is called the:
1. 9 + 1 pattern
2. 9 + 0 pattern
3. Flagellin pattern
4. 9 + 2 pattern
Microtubules are the constituents of
1. spindle fibres, centrioles and cilia
2. centrioles, spindle fibres and chromatin
3. centrosome, nucleosome and centrioles
4. cilia, flagella and peroxisomes
Mitochondria and chloroplast are
I.semi-autonomous organelles.
II. formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery.
Which one of the following options is correct?
1. Il is true but I is false
2. I is true but ll is false
3. Both I and I are false
4. Both I and II are correct
Water soluble pigments found in plant cell vacuoles are
1. chlorophylls
2. carotenoids
3. anthocyanins
4. xanthophylls
Balbiani rings are sites of
1. lipid synthesis
2. nucleotide synthesis
3. polysaccharide synthesis
4. RNA and protein synthesis
A protoplast is a cell
a. without plasma membrane
b. without nucleus
c. undergoing division
d. without cell wall
Which structures perform the function of mitochondria in bacteria?
1. Nucleoid
2. Ribosomes
3. Cell wall
4. Mesosomes
The Golgi complex plays a major role:
| 1. | in trapping the light and transforming it into chemical energy |
| 2. | in digesting proteins and carbohydrates |
| 3. | as energy transferring organelles |
| 4. | in post translational modification of proteins and glycosidation of lipids |
What is true about ribosomes?
1. The prokaryotic ribosomes are 80 S, where S stands for sedimentation coefficient
2. These are composed of ribonucleic acid and proteins
3. These are found only in eukaryotic cells
4. These are self-splicing introns of some RNAs
In eubacteria, a cellular component that resembles eukaryotic cells is
1. nucleus
2. ribosomes
3. cell wall
4. plasma membrane
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
The two subunits of ribosome remain united at a critical ion level of
1. copper
2. manganese
3. magnesium
4. calcium
Which of the following statements regarding mitochondrial membrane is not correct?
1. The outer membrane is permeable to all kinds of molecules
2. The enzymes of the electron transfer chain are embedded in the outer membrane
3. The inner membrane is highly convoluted forming a series of infoldings
4. The outer membrane resembles a sieve
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.
Three of the following statements regarding cell organelles are correct while one is wrong. Which one is wrong?
1. Lysosomes are double membraned vesicles budded off from Golgi apparatus and contain digestive enzymes.
2. Endoplasmic reticulum consists of a network of membranous tubules and helps in transport, synthesis and secretion
3. Leucoplasts are bound by two membranes, lack pigment but contain their own DNA and protein synthesizing machinery.
4. Sphaerosomes are single membrane bound and are associated with synthesis and storage of lipids.
What is common between chloroplasts, 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
Who invented electron microscope ?
1. Jansen
2. Edison
3. Knoll and Ruska
4. Landsteiner
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
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
Which one of the following structure is an organelle within an organelle?
1. Ribosome
2. Peroxysome
3. ER
4. Mesosome
Which of the following four cell structures is correctly matched with the accompanying description?
1. Plasma membrane - Outer layer of cellulose or chitin, or absent
2. Mitochondria - Bacteria like elements with inner membrane forming sacs containing chlorophyll, found in plant cells and algae
3. Chloroplasts - Bacteria like elements with inner membrane highly folded
4. Golgi apparatus - Stacks of flattened vesicles
Arrange the following in the increasing of their size
(1)virus< PPLO< typical bacteria< typical eukaryotic cell
(2) PPLO< virus< typical bacteria< typical eukaryotic cell
(3) virus< PPLO< typical eukaryotic cell< typical bacteria
(4) virus> PPLO> typical bacteria> typical eukaryotic cell
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 B and C
Integral or Peripheral proteins classification is based on
| 1. | protein size | 2. | ease of extraction |
| 3. | ease of function | 4. | ease of study |
Endomembrane system is formed because of the
1. coordinated functions of the membranous organelles
2. coordinated functions of the membraneless organelles
3. coordinated functions of all cell organelles
4. All of these
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
In plant cell the concentration of ions is more in
1. cytoplasm
2. vacuoles
3. equal in both
4. nucleus
Peroxisome is a type of
(1)vacuole
(2)inclusion bodies
(3)microbodies
(4)membraneless organelle
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 A and C