Cell: The Unit of Life

Which of the following structures is not found in a prokaryotic cell?

1. Mesosome
2. Nuclear envelope
3. Ribosome
4. Plasma membrane

Cellular organelles with membranes are -

1. endoplasmic reticulum, ribosomes and nuclei
2. lysosomes, Golgi apparatus and mitochondria
3. nuclei, ribosomes and mitochondria
4. chromosomes, ribosomes and endoplasmic reticulum

Which of the following are not membrane-bound ?

1. Ribosomes
2. Mesosomes
3. Lysosomes
4. Vacuoles

DNA is not present in :

1. Nucleus
2. Chloroplast
3. Mitochondria
4. Ribosomes

Nuclear envelope is a derivative of :

1. Membrane of Golgi complex
2. Smooth endoplasmic reticulum
3. Rough endoplasmic reticulum
4. Microtubules

The structures that are formed by stacking of organized flattened membranous sacs in the chloroplasts are

1. Stroma lamellae
2. Cristae
3. Stroma
4. Grana

Select the correct matching in the following pairs :

1. Rough ER – Oxidation of fatty acids
2. Smooth ER – Oxidation of phospholipids
3. Rough ER – Synthesis of glycogen
4. Smooth ER – Synthesis of lipids

The chromosomes in which centromere is situated close to one end are :

1. Telocentric
2. Metacentric
3. Sub-metacentric
4. Acrocentric

Which one of the following is not an inclusion body found in prokaryotes?

1. Cyanophycean granule
2. Phosphate granule
3. Polysome
4. Glycogen granule

Which structures perform the function of mitochondria in bacteria?

1. Nucleoid
2. Ribosomes
3. Cell wall
4. Mesosomes

The motile bacteria are able to move by

1. fimbriae
2. flagella
3. cilia
4. pili.

The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as:

1. Microfilaments
2. Lamins
3. Microtubules
4. Intermediate filaments

The osmotic expansion of a cell kept in water is chiefly regulated by:

1. Vacuoles
2. Plastids
3. Mitochondria
4. Ribosomes

Match the following and select the correct answer :

1. (a) (iv), (b) (iii), (c) (i), (d) (ii)
2. (a) (i), (b) (iii), (c) (ii), (d) (iv)
3. (a) (iv), (b) (ii), (c) (i), (d) (iii)
4. (a) (i), (b) (ii), (c) (iv), (d) (iii)

Pigment containing membranous extensions in some cyanobacteria are

1. pneumatophores
2. chromatophores
3. heterocysts
4. basal bodies.

The Golgi complex plays a major role :

1. as energy transferring organelles
2. in post translational modification of proteins and glycosidation of lipids
3. in trapping the light and transforming it into chemical energy
4. in digesting proteins and carbohydrates

Which one of the following organelle in the figure correctly matches with its function ? [Figure]

1. Golgi apparatus, formation of glycolipids
2. Rough endoplasmic reticulum, formation of glycoproteins
3. Rough endoplasmic reticulum, protein synthesis
4. Golgi apparatus, protein synthesis

A major site for synthesis of lipids is :

1. RER
2. Nucleoplasm
3. SER
4. Symplast

Why is a capsule advantageous to a bacterium?

1. It protects the bacterium from desiccation.
2. It provides means of locomotion
3. It allows bacterium to "hide" from host's immune system.
4. It allows the bacterium to attach to the surface.

The term 'glycocalyx' is used for :

1. bacterial cell glyco-engineered to possess N-glycosylated proteins
2. a layer present between cell wall and membrane of bacteria
3. a layer surrounding the cell wall of bacteria
4. cell wall of bacteria

Which of the following types of plastids does not contain stored food material ?

1. Elaioplasts
2. Chromoplasts
3. Amyloplasts
4. Aleuroplasts

Select the alternative giving correct identification and function of the organelle 'A' in the diagram [Figure]

1. Golgi body - provides packaging material
2. Mitochondria - produce cellular energy in the form of ATP
3. Endoplasmic reticulum - synthesis of lipids
4. Lysosomes - secrete hydrolytic enzymes

Which one of the following cellular parts is correctly described ?

1. Lysosomes - optimally active at a pH of about 8.5
2. Centrioles - sites for active RNA synthesis
3. Thylakoids - flattened membranous sacs forming the grana of chloroplasts
4. Ribosomes - those on chloroplasts are larger (80S) while those in the cytoplasm are smaller (70S)

Which one of the following structures is an organelle within an organelle ?

1. Mesosome
2. Peroxisome
3. Ribosome
4. ER

Ribosomal RNA is actively synthesized in

1. Nucleolus
2. Ribosomes
3. Lysosomes
4. Nucleoplasm

Select the correct statement from the following regarding cell membrane

1. Na+ and K+ ions move across cell membrane by passive transport
2. Lipids are arranged in bilayer with polar heads towards the inner part
3. Proteins make up 60 to 70% of the cell membrane
4. Fluid mosaic model of cell membrane was proposed by Singer and Nicolson

What is true about ribosomes ?

1. These are self-splicing introns of some RNAs.
2. These are found only in eukaryotic cells
3. These are composed of ribonucleic acid and proteins
4. The prokaryotic ribosomes are 80 S, where 'S' stands for sedimentation coefficient.

Which one of the following does not differ in E. coli and Chlamydomonas ?

1. Chromosomal Organization
2. Cell wall
3. Ribosomes
4. Cell membrane

Which one of the following is not considered as a part of the endomembrane system ?

1. Vacuole
2. Lysosome
3. Golgi complex
4. Peroxisome

The figure below shows the structure of a mitochondrion with its four parts labelled (A), (B), (C) and (D). Select the part correctly matched with its function. [Figure]

1. Part (B) : Inner membrane – forms infoldings called cristae
2. Part (C) : Cristae – possess single circular DNA molecule and ribosomes
3. Part (A) : Matrix – major site for respiratory chain enzymes
4. Part (D) : Outer membrane – gives rise to inner membrane by splitting