5. For each of the phrases in column I, state whether it applies to A only, B only, both A and B or none in column II. Write down A only, B only,
A and B, or none in your answer book.
COLUMNI
COLUMN II
5.1 Presence of a protein capsule and A: Viruses
a well defined nucleus
B Bacteria
A: Viruses
5.2 No well defined nucleus present
B: Bacteria
A: Viruses
5.3 May cause disease
B: Bacteria
5.4 Can occur as autotrophs,
A: Bacteria
saprotrophs or parasites
B: Viruses
A: Bacteria
5.5. Considered non-living
B: Viruses

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.

a. 35°c

b. 25°c

c. 10°c

d. 40°c