The data show the concentrations of sugar and starch in an onion. Total sugar including reducing sugar (/g per 100g): 3.7 Starch (/g per 100g): 0 The onion is tested with Benedict’s solution and iodine solution. Which set of results is correct?

Benedict’s solution: brick red/ iodine solution: brown

Benedict’s solution: blue/ iodine solution: blue-black

Benedict’s solution: blue/ iodine solution: brown

Benedict’s solution: brick red/ iodine solution: blue-black

Four foods were tested for each of the following nutrients: fat (using ethanol); protein (using the biuret test); reducing sugar (using Benedict’s solution), Which food contains protein and fat following the color change?

purple/illiac: ✓ - brick red/orange: X - milky white: ✓

purple/illiac:✓ - brick red/orange: X - milky white:X

purple/illiac:X - brick red/orange: ✓ - milky white:X

purple/illiac:X - brick red/orange: ✓ - milky white:✓

A student set up a test-tube containing starch, water and amylase. How could the student test whether the amylase had digested all the starch?

Weigh the test-tubes and contents before and after the experiment.

Which row correctly identifies the chemical elements found in proteins?

carbon: yes/ hydrogen: yes/ oxygen: yes/ nitrogen: yes

carbon: yes/ hydrogen: yes/ oxygen: yes/ nitrogen: no

carbon: yes/ hydrogen: no/ oxygen: yes/ nitrogen: no

carbon: no/ hydrogen: yes/ oxygen: no/ nitrogen: yes

Nutrients are made up of smaller basic units. Nutrients can be identified by food tests. Which nutrient is a protein?

smaller basic units: amino acids/ food test: biuret test

smaller basic units: amino acids/ food test: Benedict's test

smaller basic units: sugar/ food test: Benedict's test

smaller basic units: sugar/ food test: biuret test

Water is a good solvent. What does this mean?

Many substances dissolve well in it.

It dissolves well in many other substances.

It flows easily through vessels.

IGCSE Biological molecules

Authored by le khanh

Biology

9th Grade

NGSS covered

Used 134+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Small molecules are used as the basic units in the synthesis of large food molecules. Which statement is correct?

Amino acids are basic units of carbohydrates.

Fatty acids are basic units of glycogen.

Glycerol is a basic unit of oils.

Simple sugar is a basic unit of protein.

Tags

NGSS.HS-LS1-6

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When a substance is added to meat, amino acids are produced. What is this substance?

a hormone

an enzyme

an oil

water

Tags

NGSS.HS-LS1-6

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram shows part of a protein molecule. X What does X represent?

amino acid

fatty acid

glycerol

sugar

Tags

NGSS.HS-LS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Four different foods were tested for their composition. The results are shown in the choices. Which food contains protein but not reducing sugar or starch?

Benedict’s test: blue/iodine test: black/ biuret test: purple

Benedict’s test: blue/iodine test: brown/ biuret test: purple

Benedict’s test: brick red/iodine test: black/ biuret test: blue

Benedict’s test: brick red/iodine test: brown/ biuret test: blue

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the smaller basic units of starch and glycogen molecules?

Starch: amino acid/ Glycogen: fatty acid and glycerol

Starch: amino acid/ Glycogen: simple sugars

Starch: simple sugars/ Glycogen: fatty acid and glycerol

Starch: simple sugars/ Glycogen: simple sugars

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram represents a protein molecule. What do the small circles represent?

amino acids

fatty acids

glycerol

simple sugars

Tags

NGSS.HS-LS1-6

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which row shows the elements and basic units that are used in the construction of large food molecules?

food: fat/ molecules elements:carbon, hydrogen, oxygen, nitrogen/ basic units: glucose

food: fat/ molecules elements:carbon, hydrogen, oxygen, nitrogen/ basic units: glycerol

food: starch/ molecules elements:carbon, hydrogen, oxygen/ basic units: glucose

food: starch/ molecules elements:carbon, hydrogen, oxygen/ basic units: glycerol

Tags

NGSS.HS-LS1-6

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IGCSE Biological molecules

Small molecules are used as the basic units in the synthesis of large food molecules. Which statement is correct?

When a substance is added to meat, amino acids are produced. What is this substance?

The diagram shows part of a protein molecule. X What does X represent?

Four different foods were tested for their composition. The results are shown in the choices. Which food contains protein but not reducing sugar or starch?

What are the smaller basic units of starch and glycogen molecules?

The diagram represents a protein molecule. What do the small circles represent?

Which row shows the elements and basic units that are used in the construction of large food molecules?

Which nutrient produces a purple colour when mixed with biuret solution?

Which simple molecules are the basic units of protein?

Which food-testing reagent shows a positive result when it turns from blue to purple?

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