Page 5 - Module & More Biology F4

Biologi Tingkatan 4 Bab 9 Nutrisi dan Sistem Pencernaan Manusia

Perbincangan 1. Jelaskan mengapa tabung uji direndam dalam kukus air pada 37°C?
Discussion Explain why test tubes are immersed in water bath at 37°C?
37°C adalah suhu badan optimum untuk tindakan amilase liur.
37°C is the optimum body temperature for the action of the salivary amylase.
2. Terangkan keputusan tabung uji A.
Explain the results of test tube A.
• Amilase liur menghidrolisis kanji kepada glukosa.
The salivary amylase hydrolyses starch to glucose.
• Glukosa adalah gula penurun. / Glucose is a reducing sugar.
• Kehadiran gula penurun ditunjukkan dengan mendakan merah bata apabila ujian Benedict dijalankan.
Brick red precipitate is formed when tested with Benedict’s solution shows the presence of reducing sugar.
3. Terangkan keputusan di tabung uji B.
Explain the results of test tube B.
• Ujian iodin adalah positif dan ujian Benedict adalah negatif.
Positive iodine test and negative Benedict’s test.
• Tiada amilase liur di B, kanji tidak dicerna kepada gula penurun.
Starch is not digested to reducing sugar without salivary amylase.
Kesimpulan Hipotesis diterima. Enzim amilase liur menghidrolisiskan kanji kepada gula penurun .
Conclusion
The hypothesis is accepted. The salivary amylase hydrolyses starch into a reducing sugar .
2. Protein / Protein TP 3

Tujuan Mengkaji tindakan enzim pepsin dalam pencernaan sampel makanan berprotein.
Aim To study the action of pepsin in the digestion of protein food sample.
Pernyataan 9
masalah Apakah kesan tindakan pepsin ke atas protein dalam sampel makanan?
Problem What is the action of pepsin on protein food sample?
statement
Hipotesis Enzim pepsin menghidrolisis protein dalam ampaian albumen kepada polipeptida.
Hypothesis Pepsin hydrolyses protein in albumen suspension into polypeptides. BAB

Pemboleh (a) Dimanipulasikan: kehadiran enzim pepsin
ubah Manipulated: absence or presence of pepsin
Variables (b) Bergerak balas: kejernihan / kekeruhan ampaian albumen
Responding: cloudy or clear albumen suspension
(c) Dimalarkan: suhu, kepekatan ampaian albumen, pH
Constant: temperature, concentration of albumen suspension, pH
Bahan Ampaian albumen, larutan pepsin 1%, air suling, asid hidroklorik 0.1 M
Materials Albumen suspension, 1% pepsin solution, distilled water, hydrochloric acid 0.1 M
Radas Bikar, tabung uji, silinder penyukat , rak tabung uji, kukus air, termometer, penitis
Apparatus Beakers, test tubes, measuring cylinders, test tube rack, water bath, thermometers, droppers

Prosedur 1. Sediakan dua tabung uji berlabel A dan B seperti dalam jadual.
Procedure Prepare two test tubes labelled A and B as shown in the table.
Tabung Uji / Test tube Kandungan / Contents
1 ml larutan pepsin 1% + 5 ml ampaian albumen + 1 ml asid hidroklorik 0.1 M
A
1 ml 1% pepsin solution + 5 ml albumen suspension + 1 ml of 0.1 M hydrochloric acid
B 1 ml air suling + 5 ml ampaian albumen + 1 ml asid hidroklorik 0.1 M
1 ml distilled water + 5 ml albumen suspension + 1 ml of 0.1 M hydrochloric acid

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