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.