Biology Exam Questions - Digestion Assessment Questions And Correct Answers.
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Course
DIGESTION
Institution
DIGESTION
The diagram represents part of the human digestive system. The organs are labelled A−F.
Give the letter of the organ that produces amylase. (1) - correct answer C - pancreas
Give the letter of the organ that produces maltase. (1) - correct answer ...
The diagram represents part of the human digestive system. The organs are labelled A−F.
Give the letter of the organ that produces amylase. (1) - correct answer C - pancreas
Give the letter of the organ that produces maltase. (1) - correct answer E - small
intestine
Maltose is hydrolysed by the enzyme maltase.
Explain why maltase catalyses only this reaction. (3) - correct answer -maltase has
specific tertiary structure and specifically shaped active site
-only complimentary in shape to maltose
-to form enzyme-substrate complex
The diagram outlines the digestion and absorption of lipids.
Tick the box by the name of the process by which fatty acids and glycerol enter the intestinal epithelial
cell. (1) - correct answer -diffusion
Explain the advantages of lipid droplet and micelle formation. (3) - correct answer -
increased surface area
-faster hydrolysis
-carry fatty acids and glycerol through membrane
Name structure Q in the diagram above and suggest how it is involved in the absorption of lipids. (4) -
correct answer -golgi apparatus
-triglycerates are modified
, -combined with proteins
-packaged in vesicles
Bacteria are often used in industry as a source of enzymes. One reason is because bacteria divide
rapidly, producing a large number of them in a short time.
Describe how bacteria divide. (2) - correct answer -binary fission
-circular DNA replicated and cytoplasm splits down the middle to form two daughter cells, each
containing identical copies of DNA
Washing powders often contain enzymes from bacteria. These enzymes include proteases that
hydrolyse proteins in clothing stains. The graph shows the effect of temperature on a protease that
could be used in washing powder.
Explain the shape of the curves at 50 °C and 60 °C. (4) - correct answer -both
denatured by high temperatures
-50°C- activity decreases over time as protein concentration becomes limiting factor
-60°C - higher denaturation rate due to more kinetic energy
-breaking ionic bonds between amino acids
Some proteases are secreted as extracellular enzymes by bacteria.
Suggest one advantage to a bacterium of secreting an extracellular protease in its natural environment.
Explain your answer. (2) - correct answer -hydrolyses larger polypeptides
-smaller polypeptides/dipeptides/amino acids can be directly absorbed by bacteria for growth
Mammals have some cells that produce extracellular proteases. They also have cells with membrane-
bound dipeptidases.
Describe the action of these membrane-bound dipeptidases and explain their importance. (2) - correct
answer -hydrolyse polypeptides into amino acids
-allow larger polypeptides to be absorbed by the epithelium
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