Biological Molecules & Enzymes

​ (a)   is the test for starch. It appears​ (b)   when starch is present, and​ (c)   when starch is absent.

• Iodine solution
• blue/black
• yellow/brown
• Biuret solution
• The ethanol emulsion test
• Benedict's solution
• blue
• violet
• cloudy/milky
• brick-red

​ (a)   ​ is the test for protein. It appears​ (b)   when protein is present, and​ (c)   when protein is absent.

• blue/black
• yellow/brown
• Biuret solution
• The ethanol emulsion test
• Benedict's solution
• blue
• violet
• cloudy/milky
• brick-red
• Iodine solution

​ (a)   ​ is the test for reducing sugar. It appears​ (b)   when reducing sugar is present, and​ (c)   when reducing sugar is absent.

• blue/black
• yellow/brown
• Biuret solution
• DCPIP
• Benedict's solution
• blue
• violet
• cloudy/milky
• brick-red
• Iodine solution

​ (a)   ​ is the test for fats. It appears ​ (b)   when fat is present, and​ (c)   when fat is absent.

• blue/black
• yellow/brown
• Biuret solution
• DCPIP
• Ethanol emulsion test
• clear
• violet
• cloudy/milky
• Iodine solution
• colourless

​ (a)   ​ is the test for vitamin C. It appears ​ (b)   when Vitamin C is present, and​ (c)   when Vitamin C is absent.

• blue/black
• yellow/brown
• Biuret solution
• DCPIP
• Ethanol emulsion test
• blue
• violet
• cloudy/milky
• Iodine solution
• colourless

Which chemical elements are present in carbohydrates?

• carbon

• hydrogen

• oxygen

• nitrogen

• phosphorous

Which chemical elements are present in fats?

• carbon

• hydrogen

• oxygen

• nitrogen

• phosphorous

Which chemical elements are present in proteins?

• carbon

• hydrogen

• oxygen

• nitrogen

• phosphorous

Which chemical elements are present in nucleic acids?

• carbon

• hydrogen

• oxygen

• nitrogen

• phosphorous

In DNA, two strands are coiled together to form a...