Biology : Cell : The Unit of Life

Mitochondria contains

• only DNA

• DNA and RNA

• only RNA

• None of the above

Which of the following shows minimum number of chromosomes?

• n : 1

• n : 2

• n : 3

• n : 4

Who proposed 'fluid mosaic model' of plasma membrane?

• Singer and Nicholson

• Robertson

• Benneson

• None of the above

Fluid mosaic model exhibits amphipathy because of

• glycoproteins

• phospholipids

• lipids

• glycolipids

The controlling centre of cell is

• nucleus

• nucleolus

• mitochondria

• ribosome

Chromosomes in a bacterial cell can be 1 to 3 in number and

• are not circular or linear

• can be circular as well as linear within the same cell

• are always circular

• are always linear

Which of the following is a single membranous structure?

• Lysosome

• Nucleus

• Mitochondria

• Chloroplast

A prokaryotic cell lacks

• true nucleus

• nuclear membrane

• membrane bound organelles

• All of the above

Passive food ingestion in Amoeba is known as :

• import

• invagination

• circumfluence

• circumvallation

Principle protein of cillia and flagella is :

• globulin

• fibrin

• flagellin

• tubulin