SPM BIology 2015

Question

3 . Diagram 3.1 shows two types of food, butter and cooking oil. Butter is obtained from animals and cooking oils is from plants.

Rajah 3.1 menunjukkan dua jenis makanan, mentega dan minyak masak. Mentega diperoleh daripada haiwan dan minyak masak diperolej daripada tumbuhan.

(a)(i) Name the food class of butter.

Namakan kelas makanan bagi mentega.

(ii) State the function of the food class named in 3(a)(i)

Nyatakan fungsi kelas makanan yang dinamakan dalam 3(a)(i)

(iii) State two differences between butter and cooking oil.

Nyatakan dua perbezaan antara mentega dengan minyak masak.

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(b) An individual consumes a lot of butter in his daily diet. State on type of diabetes he might suffer from and explain your answer.

Seorang individu mengambil mentega dengan jumlah yang banyak dalam diet harinannya. Nyatakan satu jenis penyakit yang mungkin dihidapinya dan terangkan jawapan anda.

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(c) Diagram 3.2 shows the hydrolysis of a lipid molecule.

Rajah 3.2 menunjukkan hidrolisis satu molekul lipid.

(i) Based on Diagram 3.2, explain the hydrolysis process.

Berdasarkan Rajah 3.2, terangkan proses hidrolisis itu.

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(ii) Two dirty shirts are washed with different detergents, P and Q. Detergent P is added with lipase. The shirt which is washed with detergent P cleaner than the shirt washed with detergent Q. Explain how lipase helps in cleaning action.

Dua helai baju kotor dibasuh dengan bahan pencuci yang berbeza, P dan Q. Bahan pencuci P ditambah dengan lipase. Baju yang dibasuh dengan bahan pencuci P lebih daripada yang dibasuh dengan bahan pencuci Q. Terangkan bagaimana lipase membantu dalam tindakan pembersihan.

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Answer ( 1 )

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    2021-01-26T13:47:19+08:00

    3.a)i)Lipids

    ii)Lipids are an important source of energy.

    iii)

    Butter Cooking oil
    Contains a large amount of saturated fats Contains a higher amount of unsaturated fats
    At room temperature, it is in solid form At room temperature, it is in liquid form

     

    b)-Butter contains a lot of saturated fats, this can cause an increase in LDL (bad cholesterol) levels.

    -Higher risk of cardiovascular diseases.

    -High blood cholesterol can lead to the formation of plaque within arteries. Causes a blockage and reduces blood flow. May result in a heart attack occurring.

     

    c)i)A single lipid (triglyceride) molecule is hydrolysed with 3 molecules of water.

    -Into 1 molecule of glycerol and 3 molecules fatty acids.

    -During the hydrolysis process, the ester bonds between the lipid molecule are broken down.

    ii)-Lipase is an enzyme which breaks down lipid molecules.

    -With the help of lipase, lipids can be quickly broken down leaving the shirt cleaner.

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