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HKDSE BIOLOGY: Connecting ConceptsChapter 4Question bankMultiple-choice questionsMultiple-choice questions|!|BCEMA0040000001|!|SIDirections:Questions (a) and (b) refer to the set-up below, which is used to demonstrateosmosis.(a)The set-up was left undisturbed for one hour. Afterwards, the water in the boilingtube was tested separately using the iodine test, Benedict’s test and a protein teststrip. Which of the following correctly shows the results?Iodine testBenedict’s testProtein test stripboiling tubedialysis tubingcontainingstarch solution andamylasedistilled waterA.blue-blackbrick-red precipitatepositiveB.brownbrick-red precipitatenegativeC.blue-blackbluenegativeD.brownbluepositive□
(b)Which of the following steps can ensure that the results obtained is valid?
HKDSE BIOLOGY: Connecting ConceptsChapter 4Question bankMultiple-choice questions|!|BCEMB0040000002|!|Directions:Questions (a) and (b) refer to the diagram below, which shows the cellmembrane of an epithelial cell in the air sac.(a)Which part(s) contribute(s) the differential permeability of the cell membrane?WXYZ
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(b)The diffusion of oxygen through the epithelial cell is likely to be achieved via
HKDSE BIOLOGY: Connecting ConceptsChapter 4Question bankMultiple-choice questions|!|BCEMA0040000003|!|SIA student carried out an experiment using sections of intestine freshly isolated from arat. Cyanide ions inhibit enzymes involved in respiration. The diagram below shows aset-up.After few hours, only the concentration of glucose solution inside the intestine in testtube A increased. What can be deduced from the result?A.Oxygen is necessary for the movement of glucose across intestinal wall.B.Cyanide ions inhibit the respiratory enzymes by altering the shapes of their activesites.C.Glucose molecules enter the small intestine by active transport.D.There is net movement of water molecules from the concentrated glucose solutioninto the intestine of test tube A.fresh intestinetissuedilute glucosesolutionconcentratedglucosesolutionconcentratedglucose solution+ cyanide ionsTest tube ATest tube B