6.1.1 - Bacteria

Question 1

What is the shape of DNA in bacteria?

Answer 1

Circular loop

Question 2

What is the role of the capsule?

Answer 2

Protect bacterial cell from toxic compounds.

Question 3

What is the role of the cell wall?

Answer 3

Provides shape, support and protection to the cell and its organelles.

Question 4

What is the role of the cell membrane?

Answer 4

Prevents leakage of cytoplasmic organelles and allows the transport of specific compounds in and out of the cell.

Question 5

What is the role of plasmids?

Answer 5

Contain bacterial genes and genetic information

Question 6

What ribosomes are found in bacterial cells and what are the sub-units that make them up.

Answer 6

70S
30S + 50S

Question 7

What is the role of ribosomes in bacterial cells?

Answer 7

Site of mRNA translation and protein synthesis.

Question 8

What is the role of the circular loop of DNA?

Answer 8

Contains chromosmal DNA

Question 9

What is the definition for the role of ribosomes in all cells?

Answer 9

Catalyse the production of amino acid chains used to make proteins.

Question 10

Difference between gram positive and negative bacteria?

Answer 10

Gram positive cell walls have a thick peptidoglycan layer. Negative have a thin layer.

Question 11

What are the two stains used in differentiating between bacteria?

Answer 11

Crystal violet
Red safranin

Question 12

What colour do both gram pos. and neg. stain?

Answer 12

Gram positive - Purple/blue
Gram negative - Red