The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as:
1. Microtubules
2. Microfilaments
3. Intermediate filaments
4. Lamins
The osmotic expansion of a cell kept in water is chiefly regulated by:
1. Mitochondria
2. Vacuoles
3. Plastids
4. Ribosomes
Match the following and select the correct answer:
Column I | Column II | ||
(a) | Centriole | (i) | Infoldings in mitochondria |
(b) | Chlorophyll | (ii) | Thylakoids |
(c) | Cristae | (iii) | Nucleic acids |
(d) | Ribozymes | (iv) | Basal body of cilia or flagella |
1. A-iv, B-ii, C-i, D-iii
2. A-i, B-ii, C-iv, D-iii
3. A-i, B-iii, C-ii, D-iv
4. A-iv, B-iii, C-i, D-ii
1. | in digesting proteins and carbohydrates |
2. | as energy transferring organelles |
3. | in post-translational modification of proteins and glycosidation of lipids |
4. | in trapping the light and transforming it into chemical energy |
A major site for synthesis of lipids is:
1. SER
2. Symplast
3. Nucleoplasm
4. RER
Ribosomal RNA is actively synthesized in:
1. Lysosomes
2. Nucleolus
3. Nucleoplasm
4. Ribosomes
Which one of the following does not differ in E.coli and Chlamydomonas?
1. Ribosomes
2. Chromosomal organization
3. Cell wall
4. Cell membrane
What is true about ribosomes?
1. | The prokaryotic ribosomes are 80S, where S stands for sedimentation coefficient |
2. | These are composed of ribonucleic acid and proteins |
3. | These are found only in eukaryotic cells |
4. | These are self-splicing introns of some RNAs |