Cell: The Unit of Life

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

The main area of various types of activities of a cell is –

1. Cytoplasm
2. Plasma membrane
3. Nucleus
4. Mitochondrion

Which one of the following has its own DNA?

1. Dictyosome
2. Mitochondria
3. Peroxisome
4. Lysosome

Which one of the following structures between two adjacent cells is an effective transport pathway?

1. Endoplasmic reticulum
2. Plasmodesmata
3. Plasmalemma
4. Plastoquinones