Which of the following is NOT true of enzymes?
Their reactions are reversible
Their reactions are irreversible
They remain unchanged after the reaction
They are affected by high temperatures
They have active sites
Correct answer is B
No explanation has been provided for this answer.
The association between guinea worm and tissues of man is called
commensalism
parasitism
predation
Saprophytism
Symbiosis
Correct answer is B
No explanation has been provided for this answer.
Which of the following factors affect population?
competition and natality rate
heat and space
food and mortality rate
Space and competition
Water and light
Correct answer is E
No explanation has been provided for this answer.
When a plant shows reddish leaves, the soil is deficient in
calcium
iron
nitrogen
phosphorus
sulphur
Correct answer is D
No explanation has been provided for this answer.
chicken pox
common cold
measles
poliomyelitis
tuberculosis
Correct answer is E
No explanation has been provided for this answer.