(Q).
Q: What are the proteins called that speed up biochemical reactions in cells? Choices: - peptides - hormones - carbohydrates - enzymes A:
(A).
enzymes

(Q).
Q: Caffeine is an example of what type of drug? Choices: - depressant - barbiturate - nicotine - psychoactive A:
(A).
psychoactive

(Q).
Q: What is the molten material deep within the earth? Choices: - volcanic mass - crystals - lava - magma A:
(A).
magma