Biology MAB

THE ROLE OF ENZYMES
What is the role of enzymes?

Which of the following correctly describes the activity of enzymes?

(A) As temperature decreases, enzyme activity increases.
(B) All enzymes work best with a pH range of 5 to 8.
(C) Each enzyme catalyses a number of reactions.
(D) Enzymes work by providing an active site for a substance.

Before Renal dialysis could be developed, knowledge was needed of which three bodily processes?

(A) Digestion, respiration, filtration
(B) Excretion, osmosis, respiration
(C) Digestion, diffusion, membrane structure
(D) Excretion, diffusion, membrane structure

Which if the following statements best describes the role of the excretory system in maintaining humans as functioning organisms?

(A) Production of metabolic wastes in animals
(B) Removal of oxygen from the blood stream
(C) Production of metabolic compounds for storage
(D) Removal of wastes produced by metabolic processes

Which of the following statements best describes aldosterone?

(A) A substance that enlarges the kidney tubules
(B) A substance secreted by plants for germination
(C) A hormone associated with water and salt regulation
(D) A hormone causing secondary sexual characteristics

The circulatory system in mammals transports oxygen to and from cells. Which of the following statements correctly describes the way oxygen is transported within the circulatory system?

(A) Oxygen is transported in a network of veins.
(B) Oxygen molecules are transported in arteries.
(C) Oxygen is transported attached to haemoglobin.
(D) Oxygen is transported attached to which blood cells.

Enzymes are specific in their reactions. Which of the following will not affect the action of an enzyme?

(A) Change in pH
(B) Change in temperature
(C) Change in volume of substrate
(D) Change in concentration of substrate

Which tissue is used to move products of photosynthesis in multicellular land plants?

(A) Xylem tissue
(B) Vascular bundles
(C) Cambium tissue
(D) Phloem tissue

Which of the following is critical to the functioning of the respiratory, digestive and excretory systems?

(A) Dry surface tissues
(B) Large surface area
(C) Quick flow of material
(D) Large oxygen supply

Which of the following plants possesses adaptations to the extreme conditions found in an estuarine environment?

(A) Grass
(B) Sedge
(C) Mangrove
(D) Casuarina