Biological Molecules (CS) Quiz

Large biological molecules in this topic are built from smaller molecules. Which of the following correctly lists these subunits?

• Water molecules and minerals

• Inorganic ions and gases

• Glucose (for carbohydrates), amino acids (for proteins), and fatty acids with glycerol (for fats and oils)

• Nucleotides and vitamins

According to the outline, starch, glycogen, and cellulose are large molecules formed from which simple molecule?

• Amino acids

• Glucose

• Fatty acids

• Nucleotides

In the B4 topic, proteins are said to be built from which type of smaller molecules?

• Glucose units

• Fatty acids

• Amino acids

• Nucleotides

Which qualitative test from the outline is used to detect the presence of starch?

• Benedict's solution test

• Biuret test

• Ethanol emulsion test

• Iodine solution test

Which test is specifically used to detect reducing sugars?

• Iodine solution test

• Benedict's solution test

• Biuret test

• Ethanol emulsion test

Which test is used to detect proteins according to the syllabus outline?

• Iodine solution test

• Benedict's solution test

• Ethanol emulsion test

• Biuret test

To detect lipids, which qualitative test is described in the B4 topic?

• Biuret test

• Iodine solution test

• Benedict's solution test

• Ethanol emulsion test

A laboratory test on a mashed potato sample using iodine solution shows a distinct blueblack color. This result indicates:

• Absence of starch

• Presence of starch

• Presence of proteins

• Presence of lipids

When Benedict's test is performed on a sample of grape juice, the solution changes from blue to yellow. This indicates:

• No reducing sugars present

• Presence of starch

• A low concentration of reducing sugars

• Presence of proteins

A sample of egg white is tested with the Biuret reagent and the solution remains blue. This result shows that:

• No protein is present

• A high concentration of proteins is present

• Lipids are present

• Reducing sugars are present