Food types and food tests

What substance is identified using Biuret Test?

• Starch

• Proteins

• Reducing Sugars

• Lipids

Answer explanation

The Biuret Test is specifically used to detect proteins. It reacts with peptide bonds, resulting in a color change, which indicates the presence of proteins, making it the correct choice over starch, reducing sugars, or lipids.

In the Iodine test, what colour represent a positive result?

• Blue/black

• Blue

• No change

• Red

Answer explanation

In the Iodine test, a positive result is indicated by a blue/black color change, which occurs when iodine interacts with starch, forming a complex that produces this distinct color.

What substance is identified using Iodine?

• Lipids

• Proteins

• Starch

• Reducing Sugars

Answer explanation

Iodine is used to test for starch. When iodine comes into contact with starch, it forms a blue-black complex, indicating the presence of starch. Therefore, the correct answer is starch.

TRUE OR FALSE: a builder requires more energy than an office worker?

• True

• False

Answer explanation

True. A builder typically engages in physically demanding tasks that require more energy compared to an office worker, who generally has a more sedentary job.

TRUE OR FALSE: there are 1000 J in a kilojoule (kJ)?

• False

• True

Answer explanation

True. A kilojoule (kJ) is equal to 1000 joules (J). Therefore, the statement that there are 1000 J in a kilojoule is correct.

Nutrients that help us repair and grow

• Carbohydrate

• Protein

Answer explanation

Protein is essential for repairing and growing tissues in the body, making it the correct choice for nutrients that aid in these processes. Carbohydrates primarily provide energy, not repair.

We know a food contains glucose if it makes

• Benedict's solution turn orange/red.

• Benedict's solution turns blue/black.

• iodine turns orange/red.

• iodine turns blue/black.

Answer explanation

Benedict's solution turns orange/red in the presence of glucose, indicating a positive test for reducing sugars. The other options relate to different substances: iodine tests for starch, which turns blue/black.

We test foods for glucose using

• a flame test.

• Biuret solution.

• Benedict's solution.

• iodine.

Answer explanation

We test foods for glucose using Benedict's solution, which reacts with reducing sugars like glucose, changing color. The other options are not suitable for glucose testing.

Which statement is the best description of a balanced diet?

• A balanced diet means eating lots of fruit and vegetables

• A balanced diet is where you get the right proportion of each food group

• A balanced diet is where you eat absolutely no fat or sugar

• A balanced diet is when you have the same mass of each food group

Answer explanation

The best description of a balanced diet is getting the right proportion of each food group. This ensures you receive all necessary nutrients, rather than focusing solely on fruits, avoiding fats, or having equal amounts of each group.

What does the term 'malnutrition' mean?

• The process of muscle contractions that moves food through your digestive system

• The scientific word for being seriously overweight

• Not getting everything that your body needs from your diet

• Absorption in the small intestine

Answer explanation

The term 'malnutrition' refers to not getting everything that your body needs from your diet, which can include deficiencies in essential nutrients, rather than being related to weight or digestion.