Cell theory was given by
(1) Anton van Leeuwenhoek
(2) Robert Hooke
(3) Schleiden and Schwann
(4) Robert Brown and Rudolf Virchow
Which of the following cell organelles is non-membrane bound and found in both prokaryotes and eukaryotes?
Which type of vacuoles provide buoyancy to bacteria?
(1) Sap vacuoles
(2) Contractile vacuoles
(3) Gas vacuoles
(4) Food vacuoles
The main chemical component of fungal cell wall is
Which of the following cell organelles is not considered as a part of an endomembrane system?
(3) Golgi complex
The type of ribosomes found inside the mitochondria is
The plastids which store proteins are
The chromosomes having centromere at terminal end are called
Each centriole has a cart wheel organisation having a whorl of tubulin fibrils at periphery. These peripheral fibrils are composed of how many microtubules?
Consider the following statements and choose the incorrect option
a. Large and more numerous nucleoli are present in cells actively carrying out protein synthesis.
b. Nuclear pores allow bidirectional movement of molecules.
c. Cytoskeleton is a glycolipid structure for mechanical support, motility and maintenance of the shape of the cell.
d. Steroidal hormones are synthesized by Golgi complex.
(1) a and b
(2) b and c
(3) c and d
(4) a and d
Eukaryotic cells have a well organised nucleus and
a. Both 70S and 80S types of ribosomes
b. Flagella associated with 9 + 2 organisation
c. Shows cytoplasmic streaming
d. Their DNA is complexed with histones to constitute the chromatin
(1) All are correct
(2) Only a is incorrect
(3) Only c and d are correct
(4) Both b and c are incorrect
9+2 organisation is present in
(1) Flagella of bacteria
(2) Flagella and cilia of eukaryotic cell
(3) Basal body
(4) Centriole and basal body
Which structures perform the function of mitochondria in bacteria?
(3) Cell wall
The solid linear cytoskeletal elements having a diameter of 6nm and made up of a single type of monomer are known as
(3) Intermediate filaments
The Golgi complex plays a major role
(1) In digesting proteins and carbohydrates
(2) As energy transferring organelles
(3) In post translational modification of proteins and glycosidation of lipids
(4) In trapping the light and transforming it into chemical energy
Which one of the following does not differ in E.coli and Chlamydomonas?
(1) Cell wall
(2) Cell membrane
(4) Chromosomal organization
Select the correct statement from the following regarding cell membrane
(1) Lipids are arranged in a bilayer with polar heads towards the inner part
(2) Fluid mosaic model of cell membrane was porposed by Singer and Nicolson
(3) Na+ and K+ ions move across cell membrane by passive transport
(4) Proteins make up 60 to 70% of the cell membrane
Which one of the following cellular parts is correctly described?
(1) Thylakoids-flattened membranous sacs forming the grana of chloroplasts
(2) Centrioles - sites for active RNA synthesis
(3) Ribosomes-those on chloroplasts are larger (80S) while those in the cytoplasm are smaller (70S)
(4) Lysosomes-optimally active at a pH of about 8.5
The main arena of various types of activities of a cell is
(2) Plasma membrane
Which one of the following statements about the particular entity is true?
(1) Centromere is found in animal cells, which produces aster during cell division
(2) The gene for producing insulin is present in every body cell
(3) Nucleosome is formed of nucleotides
(4) DNA consists of a core of eight histones
(1) Locomotory structures
(2) Membranes connecting the nucleus with plasmalemma
(3) Connections between adjacent cells
(4) Lignified cemented layers between cells
Polysome is formed by
(1) Ribosomes attached to each other in a linear arrangement
(2) Several ribosomes attached to a single mRNA
(3) Many ribosomes attached to a strand ofendoplasmic reticulum
(4) A ribosome with several subunits
Keeping in view the ‘fluid mosaic model’ for the structure of cell membrane, which one of the following statements is correct w.r.t. the movement of lipids and proteins from one lipid monolayer to the other (described as flip-flop movement)?
(1) Neither lipids nor proteins can flip-flop
(2) Both lipids and proteins can flip-flop
(3) While lipids can rarely flip-flop, proteins cannot
(4) While proteins can flip-flop, lipids cannot
The two sub-units of ribosome remain united at a critical ion level of
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
A major breakthrough in the studies of cells came with the development of electron microscope. This is because
(1) The resolution power of the electron microscope is much higher than that of the light microscope
(2) The resolving power of the electron microscope is 200 – 350 nm as compared to 0.1 – 0.2 nm for the light microscope
(3) Electron beam can pass through thick materials, whereas light microscopy requires thin sections
(4) The electron microscope is more powerful than the light microscope as it uses a beam of electrons which has wavelength much longer than that of photons
Why is a capsule advantageous to a bacterium?
(1) It allows the bacterium to attach to the surface
(2) It protects the bacterium from desiccation
(3) It provides means of locomotion
(4) It allows bacterium to hide from host's immune system
Which one of the following structures between two adjacent cells is an effective transport pathway?
(4) Endoplasmic reticulum
Which cell organelle is concerned with glycosylation of protein?
(3) Endoplasmic reticulum
Microtubule is involved in the
(1) Muscle contraction
(2) Membrane architecture
(3) Cell division
(4) DNA recognition
The maximum formation of mRNA occurs in
The eukaryotic genome differs from the prokaryotic genome because
(1) The DNA is complexed with histone in prokaryotes
(2) The DNA is circular and single stranded in prokaryotes
(3) Repetitive sequences are present in eukaryotes
(4) Genes in the former case are organized into operons
Function of telomeres in nucleus is
(1) Poleward movement
(2) To initiate the RNA synthesis
(3) To seal the ends of chromosome
(4) To recognise the homologous chromosome
Which of the following occurs more than one and less than five in a chromosome?
Genetically inactive and highly condensed region with tightly packed DNA is