EXPERIMENTING SKILLS

Diagram shows human cheek cell viewed under light microscope?

Choose two points needed in correct drawing.

• label 3 structures

• 2 dimensional drawing

• 3 dimensional drawing

• 4 dimensional drawing

Which two of the followings are the safety precaution for this osmometer experiment?

• submerge Visking tubing into distilled water

• rinse Visking tubing after tying both ends

• use thread to tie the Visking tubing

• use syringe to fill the Visking tubing

Diagram shows a precautionary step in studying how temperature affects enzyme reaction.

Why substrate and enzyme are not mixed together?

• for maximum rate of enzyme reaction

• to let them in respective temperatures

• to avoid explosions

• to cool them up

What is the function of soda lime?

• releases oxygen

• releases carbon dioxide

• absorbs carbon dioxide

• absorbs water vapour

Why the glucose solution is boiled for this experiment?

• to ensure it is warm enough for yeast activity

• to ensure paraffin oil functions well

• to remove carbon dioxide

• to remove oxygen

Why do experiments using digestive enzymes applies water bath at 37^OC ?

• optimum temperature

• body temperature

• melting point

• boiling point

How these nuts have different energy values?

• the larger the size, the higher the energy value

• the higher the mass, the higher the energy value

• the higher the lipid content, the higher the energy value

• the larger the protein content, the higher the energy value

Which is not a precautionary step for this potometer experiment?

• cut the twig obliquely using a sharp knife

• immediately place the leafy twig in water

• smear vaseline all over the leafy twig

• wipe dry all leaves using tissue paper