The main arena of various types of activities of a cell is
1. plasma membrane
2. mitochondrion
3. cytoplasm
4. nucleus
The plasma membrane consists mainly of
1. | phospholipids embedded in a protein bilayer |
2. | proteins embedded in a phospholipid bilayer |
3. | proteins embedded in a polymer of glucose molecules |
4. | proteins embedded in a carbohydrate bilayer |
Middle lamella is mainly composed of
1. hemicellulose
2. muramic acid
3. calcium pectate
4. phosphoglycerides
Cytoskeleton is made up of
1. | calcium carbonate granules |
2. | callose deposits |
3. | cellulosic microfibrils |
4. | proteinaceous filaments |
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 |
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 |
Which one of the following is not a constituent of cell membrane ?
1. Cholesterol
2. Glycolipids
3. Proline
4. Phospholipids
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 |
The organelle common among prokaryotic and eukaryotic cell is
1. centrosome
2. ribosome
3. peroxisome
4. glyoxysome
A chromosome carrying the centromere at one of the ends is called
1. acentric
2. submetacentric
3. telocentric
4. metacentric.