Q. No.Which one of the following is not considered as a part of the endomembrane system?
1.
Lysosome
2.
Golgi complex
3.
Peroxisome
4.
Vacuole
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.
| 1. | Part (A) : Matrix – a major site for respiratory chain enzymes |
| 2. | Part (D) : Outer membrane – gives rise to the inner membrane by splitting |
| 3. | Part (B) : Inner membrane – forms infoldings called cristae |
| 4. | Part (C) : Cristae – possess single circular DNA molecule and ribosome |
Identify the components labelled A, B, C and D in the diagram below from the list (i) to (viii) given along with:
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:
| A | B | C | D | |
| 1. | (i) | (iv) | (viii) | (vi) |
| 2. | (vi) | (v) | (iv) | (vii) |
| 3. | (v) | (i) | (iii) | (ii) |
| 4. | (v) | (iv) | (viii) | (iii) |
An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called:
1. Endoplasmic Reticulum
2. Plasmalemma
3. Cytoskeleton
4. Thylakoid
Which one of the following cellular parts is correctly described?
| 1. | Centrioles - sites for active RNA synthesis |
| 2. | Ribosomes - those on chloroplasts are larger (80s) while those in the cytoplasm are smaller (70s) |
| 3. | Lysosomes - optimally active at a pH of about 8.5 |
| 4. | Thylakoids - flattened membranous sacs forming the grana of chloroplasts |
The cell membranes are mainly composed of:
1. Phospholipids
2. Proteins
3. Fats
4. Carbohydrates
According to the widely accepted "fluid mosaic model", cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statements is incorrect:
| 1. | Proteins can also undergo flip-flop movements in the lipid bilayer |
| 2. | Many proteins remain completely embedded within the lipid bilayer |
| 3. | Proteins in cell membranes can travel within the lipid bilayer |
| 4. | Proteins can remain confined within certain domains of the membrane |
The main organelle involved in the modification and routing of newly synthesized proteins to their destinations is -
1. Endoplasmic Reticulum
2. Lysosome
3. Mitochondria
4. Chloroplast
Role of microtubules is:
| 1. | To help in cell division |
| 2. | Cell membrane formation |
| 3. | Respiration |
| 4. | Pinocytosis |
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