Cell: The Unit of Life

In fluid mosaic model of plasma membrane

1. Phospholipids form a bimolecular layer in middle part
2. Upper layer is non-polar and hydrophilic
3. Proteins form a middle layer
4. Polar layer is hydrophobic

Difference in gram positive and gram negative bacteria is due to

1. cell wall
2. cell membrane
3. ribosome
4. cytoplasm

Element necessary for the middle lamella is

1. K
2. Cu
3. Ca
4. Zn

Microtubules are absent in:

1. Spindle fibres
2. Mitochondria
3. Centriole
4. Flagella

Spindle fibres unite with which structure of chromosomes?

1. Chromocentre
2. Chromomere
3. Kinetochore
4. Centriole

Lysosome contains:

1. Reductive enzymes
2. Oxidative enzymes
3. Anabolic enzymes
4. Hydrolytic enzymes

Which of the following ribosomes are engaged in protein synthesis in animal cell?

1. Ribosomes of only nucleolus and cytosol
2. Ribosomes which occur on nuclear membrane and E.R.
3. Ribosomes of only mitochondria and cytosol
4. Ribosomes of only cytosol

Function of telomeres in nucleus is

1. To seal the ends of chromosome
2. Poleward movement
3. To recognize the homologous chromosome
4. To initiate the RNA synthesis

Which cell organelle is concerned with glycosylation of protein?

1. Endoplasmic reticulum
2. Ribosome
3. Mitochondria
4. Peroxisome