2004

YEAST CELLS PRODUCE ETHANOL IN A PROCESS CALLED FERMENTATION. IS THIS PROCESS AFFECTED BY TEMPERATURE ?

Yes. Because the rate of enzyme action is affected by temperature.

DRAW A LABELLED DIAGRAM TO SHOW THE STRUCTURE OF RHIZOPUS.

DESCRIBE THE STAGES INVOLVED IN THE SEXUAL REPRODUCTION OF A ZYGOSPORE (DIAGRAM)

1. Occurs between + strain and - strain. When hyphae of opposite strains grow close together, swellings form on both strains and touch each other
2. Nuclei from both hyphae move into these swellings which are now called progametangia
3. cross walls form to produce gametangia
4. The walls of the gametangia dissolve and... (More)

M O V E M E N T T H R O U G H C E L L M E M B R A N E

2008

DRAW A LABELLED DIAGRAM OF A TRANSVERSE SECTION OF A YOUNG ROOT

WATER ENTERS THE OUTERMOST CELLS OF THE ROOT BY OSMOSIS.WHAT DOES THIS TELL YOU ABOUT THE CELL SAP OF THESE OUTERMOST CELLS?

• They have a lower water concentration

OSMOSIS HAS BEEN DESCRIBED AS A SPECIAL CASE OF DIFFUSION. EXPLAIN WHY.

Osmosis is the movement of water from where the water is in high concentration to an area where the water... (More)