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:

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.

Cell theory was proposed by

(1) a botanist

(2) a zoologist

(3) a botanist and a zoologist

(4) a psychologist.

Which of the following organelles contain DNA?

(i) Mitochondria (ii) Chloroplasts (iii) Golgi bodies (iv) Ribosomes

(1) (i) and (ii)

(2) (ii) and (iii)

(3) (i) only

(4) (iv) only.