1.2 Bacteria And Yeast

Question 1

What do yeast cells contain

Answer 1

Nucleus
Cell wall
Cytoplasm
Cell membrane

Question 2

Are yeast cells bigger or smaller than bacteria cells

Answer 2

Most yeast cells are 3-4um this makes them bigger than bacteria but still very small

Question 3

How do yeast cell reproduce

Answer 3

Asexual breeding this involves a new cell growing out from the original one to for, a new separate yeast organism

Question 4

How are yeast cells specialised

Answer 4

Yeast cells are specialised to survive for a long time even when there is little oxygen available.

When yeast cells have plenty of oxygen they use aerobic respiration. They use oxygen to break down sugars to provide energy for the cell. During this process they produce water and C02 as a waste product.

When there’s little oxygen yeast use anaerobic respiration, when yeast cells break sugars down without oxygen they produce ethanol and C02.

Ethanol is referred to as alcohol and the anaerobic respiration of yeast is sometimes called fermentation.

Question 5

What are some uses for yeast cells

Answer 5

Making bread, alcohol

Question 6

What type of microorganism is yeast?

Answer 6

Single celled organism