The true nucleus is absent in:
DNA is not present in:
Cytochromes are found in:
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
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
Select the correct statement from the following regarding cell membrane:
1. | Na+ and K+ ions move across cell membranes by passive transport |
2. | Proteins make up 60% to 70% of the cell membrane |
3. | Lipids are arranged in a bilayer with polar heads towards the inner part |
4. | Fluid mosaic model of the cell membrane was proposed by Singer and Nicolson |