Cell: The Unit of Life · Question 85

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

In eubacteria, a cellular component that resembles eukaryotic cell is

1. plasma membrane
2. nucleus
3. ribosomes
4. cell wall

Which one of the following organisms is not a eukaryote?

1. Paramecium caudatum
2. Escherichia coli
3. Euglena viridis
4. Amoeba proteus

Peptide synthesis inside a cell takes place in :

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

Important site for formation of glycoproteins and glycolipids is :

1. Plastid
2. Lysosome
3. Golgi apparatus
4. Vacuole

An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called -

1. Cytoskeleton
2. Endoplasmic Reticulum
3. Thylakoid
4. Plasmalemma