Cell: The Unit of Life

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

Identify the components labelled A, B, C and D in the diagram below from the list (i) to (viii) given along with – [Figure] Components : (i) Cristae of mitochondria (ii) Inner membrane of mitochondria (iii) Cytoplasm (iv) Smooth endoplasmic reticulum (v) Rough endoplasmic reticulum (vi) Mitochondrial matrix (vii) Cell vacuole (viii) Nucleus The correct components are :

1. (A) (v), (B) (iv), (C) (viii), (D) (iii)
2. (A) (i), (B) (iv), (C) (viii), (D) (vi)
3. (A) (v), (B) (i), (C) (iii), (D) (ii)
4. (A) (vi), (B) (v), (C) (iv), (D) (vii)

Membrane-bound organelles are absent in

1. Saccharomyces
2. Streptococcus
3. Chlamydomonas
4. Plasmodium

Algae have cell wall made up of:

1. cellulose, galactans and mannans
2. hemicellulose, pectins and proteins
3. pectins, cellulose and proteins
4. cellulose, hemicellulose and pectins

The plasma membrane consists mainly of –

1. proteins embedded in a carbohydrate bilayer
2. phospholipids embedded in a protein bilayer
3. proteins embedded in a phospholipid bilayer
4. proteins embedded in a polymer of glucose molecules