Cells Bacteria and Yeast

Question 1

Features of a bacterium (other than those shared with plant and animal)

Answer 1

Sometimes a slime layer; (roughly) circular, chromosomal DNA; plasmid DNA; sometimes flagella

Question 2

What is the slime layer of a bacterium for?

Answer 2

Protection, allows ‘clumping’ for added protection

Question 3

What is one advantage of bacteria having plasmid DNA?

Answer 3

Useful for genetic engineering

Question 4

Is a yeast cell bigger or smaller than a bacterial one?

Answer 4

Bigger (3 or 4 times)

Question 5

Structure of a yeast cell?

Answer 5

Nucleus, cell wall, cytoplasm, cell membrane, mitochondria

Question 6

What are the products when yeast breaks down sugar in the presence of oxygen?

Answer 6

Carbon dioxide, water (waste products)

Question 7

What are the products when yeast breaks down sugar without oxygen, and what is this processes known as?

Answer 7

Ethanol + carbon dioxide

Anaerobic respiration or fermentation (with yeast only)

Question 8

Balanced symbol equation for anaerobic respiration?

Answer 8

C6H12O6 -> 2CH3CH2OH + 2CO2 + Heat