Q. No.Polysome is formed by
1.
several ribosomes attached to a single mRNA
2.
many ribosomes attached to a strand of endoplasmic reticulum
3.
a ribosome with several subunits
4.
ribosomes attached to each other in a linear arrangement
The two subunits of ribosome remain united at a critical ion level of
1. copper
2. manganese
3. magnesium
4. calcium
Vacuole in a plant cell:
| 1. | is membrane-bound and contains storage proteins and lipids
|
| 2. | is membrane-bound and contains water and excretory substances
|
| 3. | lacks membrane and contains air
|
| 4. | lacks membrane and contains water and excretory substances |
In germinating seeds fatty acids are degraded exclusively in the
1. proplastids
2. glyoxysomes
3. peroxisomes
4. mitochondria
Which one of the following is not a constituent of cell membrane ?
1. Cholesterol
2. Glycolipids
3. Proline
4. Phospholipids
Lysozyme that is present in perspiration, saliva and tears, destroys:
1. certain fungi
2. certain types of bacteria
3. all viruses
4. most virus-infected cells
Select the wrong statement from the following:
| 1. | both chloroplasts and mitochondria contain an inner and an outer membrane |
| 2. | both chloroplasts and mitochondria have an internal compartment, the thylakoid space bounded by the thylakoid membrane |
| 3. | both chloroplasts and mitochondria contain DNA |
| 4. | the chloroplasts are generally much larger than mitochondria |
Which of the following statements regarding mitochondrial membrane is not correct?
| 1. | The outer membrane is permeable to all kinds of molecules |
| 2. | The enzymes of the electron transfer chain are embedded in the outer membrane |
| 3. | The inner membrane is highly convoluted forming a series of infoldings |
| 4. | The outer membrane resembles a sieve |
Which of the following statements regarding cilia is not correct ?
| 1. | The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane |
| 2. | Cilia are hair-like cellular appendages |
| 3. | Microtubules of cilia are composed of tubulin |
| 4. | Cilia contain an outer ring of nine doublet microtubules surrounding two single microtubules |
The organelle common among prokaryotic and eukaryotic cell is
1. centrosome
2. ribosome
3. peroxisome
4. glyoxysome
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