Chemical Elements and Biological Compounds

Question 1 of 21

1

Glycogen is the storage polysaccharide for plants

Select one of the following:

True
False

Explanation

Question 2 of 21

1

Which one of these is a structural property of cellulose?

Select one of the following:

Contains α- 1,4 glycosidic bonds
Consists of perpendicular chains.
Every other β glucose is inverted.
There are ionic bonds between the chains

Explanation

Question 3 of 21

5

Fill the blank spaces to complete the text.

Chitin is the component of and of insects and crustaceans. They contain N-acetylgnocosamine (which has ). The structure is similar to β but each one of the is bonded to each , which equals to the . This forms β-1,4 . are formed between polymers, which increases the .

Explanation

Question 4 of 21

1

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Condensation is the joining of two , which creates a molecule of .

Explanation

Question 5 of 21

1

Label the sections in colour:

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Amino group (N terminal)

Hydrogen atom

Variable side chain

Carboxyl group (C- terminal)

Explanation

Question 6 of 21

1

Fill the blank space to complete the text.

There are about different amino acids found in humans.

Explanation

Question 7 of 21

2

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Protein has a high proportion of alpha in its secondary structure and protein has a high proportion of beta in its secondary structure.

Explanation

Question 8 of 21

1

Label this water molecule.

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No charge oxygen

Negatively charged oxygen

Positively charged hydrogen

Negatively charged hydrogen

No charge hydrogen

Explanation

Question 9 of 21

2

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Proteins are made of ( multiple polypeptide chains, multiple hydrogen chains, 3 polypeptide chains, 3 hydrogen chains ) (known as ( protein subunits, protein units, protein ions, protein molecules )). These refers to the interaction of these ( subunits, ions, molecules, units ) and ( arrangement, functions ) of aggregate protein complex.

Explanation

Question 10 of 21

1

Which one of these are not a property of water?

Select one of the following:

Water is a solvent
Water is a metabolite
Water has a high latent heat of vaporisation
Water has a high specific heat capacity
Water has cohesion
Water has a high surface tension
Water has high density
Water is transparent
Water contains strong hydrogen bonds

Explanation

Question 11 of 21

4

Water as solvents:
Water molecules are ❌ so they attract ❌ and polar molecules (such as ❌). Chemical reaction takes place in ❌. Water transports dissolved substances by ❌, in animals, and ❌ (through xylem) and ❌ (through phloem) in plants.

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dipoles

monopoles

ions

glucose

galactose

fructose

solution

lower temperatures

higher temperatures

plasma

minerals

vitamines

sucrose

Explanation

Question 12 of 21

1

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Water as a metabolite:
Water is used in . uses CO2 to produce glucose. needs water to split up a molecule.

Explanation

Question 13 of 21

2

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Water has a high specific heat capacity:
( Large, Small ) amount of heat energy is needed to raise its temperature, due to the ( hydrogen, covalent, disulphuric ) bonds restricting movement with ( increasing, deacreasing ) kinetic energy. This prevents temperature ( fluctuations, changes, maintenance ) which stabilises aquatic habitats. It allows ( enzymes, amino acids, nerves ) and cells to function properly.

Explanation

Question 14 of 21

1

Label the table below:

Drag an answer into the correct orange point.

Drops of iodine

Blue-black colour

Yellow-brown colour

Add Benedict's reagent

Shake and heat solution

Brick-red

Blue

Repeat procedure from box above

1st = blue

1st = brick red

Add acid to solution

Heat solution again

Add alkaline for neutralisation

2nd = brick red

2nd = blue

Add biuret reagent

Purple

Blue (same colour as solution)

Add drops of absolute ethanol

Cloudy white precipitate/emulsion

Clear

Forms an emulsion

Explanation

Question 15 of 21

1

Which of these is not an example of a micronutrient?

Select one of the following:

Magnesium
Iron
Phosphate
Calcium
Copper

Explanation

Question 16 of 21

1

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Maltose contains α-Glucose and ( α-Glucose, Galactose, Fructose ). This is useful in ( germinating seeds, mammalian milk, transport in phloem of flowering plants ). Lactose contains α-Glucose and ( Galactose, α-Glucose, Fructose ). This is useful in ( mammalian milk, germinating seeds, transport in phloem of flowering plants ). Sucrose contains α-Glucose and ( Fructose, α-Glucose, Galactose ). This is useful in the ( transport in phloem of flowering plants, mammalian milk, germinating seeds ).

Explanation

Question 17 of 21

1

Which of these are functions of monosaccharides?

Select one or more of the following:

Source in energy respiration
Building blocks for larger molecules
Intermediates in reactions
Constituents of nucleotides

Explanation

Question 18 of 21

1

Label the image with the appropriate bond types

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Peptide

Hydrogen

Ionic/Disulphide

Explanation

Question 19 of 21

5

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Globular proteins are and folded so they are in water. Examples of globular proteins are , antibodies, hormones and plasma proteins.

Fibrous proteins are long and so they are in water. They have functions, as in bones. Fibrous proteins are strong and tough due to the polypeptide chains with many cross-. Tropocollagen, a single fibre, consists of 3 identical polypeptide chains wrapped around each other, linked by bonds, which makes it .

Explanation

Question 20 of 21

4

Cellulose is the most abundant organic molecule on earth, which makes it a ❌ polysaccharide. It consists of ❌ in a long, ❌ chain shape. Every other β glucose is inverted to ❌° to form a β ❌ and each chain is bonded using ❌. Bonded group of chains form ❌, which groups to form fibrils, to increase the ❌.

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β glucose

structural

parallel

180

1-4 glycosidic bonds

hydrogen bonds

microfibrils

strength

Explanation

Question 21 of 21

1

What is the name for the bonds found in triglycerides?

Select one of the following:

Ester
Hydrogen
Covalent
Peptide bond

	Created by Taz P about 7 years ago

Unit 1.1 of the Eduqas textbook

Chemical Elements and Biological Compounds

Chemical Elements and Biological Compounds

Question 1 of 21

Glycogen is the storage polysaccharide for plants

Select one of the following:

Explanation

Question 2 of 21

Which one of these is a structural property of cellulose?

Select one of the following:

Explanation

Question 3 of 21

Fill the blank spaces to complete the text.

Chitin is the component of and of insects and crustaceans. They contain N-acetylgnocosamine (which has ). The structure is similar to β but each one of the is bonded to each , which equals to the . This forms β-1,4 . are formed between polymers, which increases the .

Explanation

Question 4 of 21

Fill the blank spaces to complete the text.

Condensation is the joining of two , which creates a molecule of .

Explanation

Question 5 of 21

Label the sections in colour:

Drag an answer into the correct orange point.

Explanation

Question 6 of 21

Fill the blank space to complete the text.

There are about different amino acids found in humans.

Explanation

Question 7 of 21

Fill the blank spaces to complete the text.

Protein has a high proportion of alpha in its secondary structure and protein has a high proportion of beta in its secondary structure.

Explanation

Question 8 of 21

Label this water molecule.

Drag an answer into the correct orange point.

Explanation

Question 9 of 21

Select from the dropdown lists to complete the text.

Explanation

Question 10 of 21

Which one of these are not a property of water?

Select one of the following:

Explanation

Question 11 of 21

Water as solvents: Water molecules are ❌ so they attract ❌ and polar molecules (such as ❌). Chemical reaction takes place in ❌. Water transports dissolved substances by ❌, in animals, and ❌ (through xylem) and ❌ (through phloem) in plants.

Drag and drop to complete the text.

Explanation

Question 12 of 21

Fill the blank spaces to complete the text.

Water as a metabolite: Water is used in . uses CO2 to produce glucose. needs water to split up a molecule.

Explanation

Question 13 of 21

Select from the dropdown lists to complete the text.

Explanation

Question 14 of 21

Label the table below:

Drag an answer into the correct orange point.

Explanation

Question 15 of 21

Which of these is not an example of a micronutrient?

Select one of the following:

Explanation

Question 16 of 21

Select from the dropdown lists to complete the text.

Explanation

Question 17 of 21

Which of these are functions of monosaccharides?

Select one or more of the following:

Explanation

Question 18 of 21

Label the image with the appropriate bond types

Drag an answer into the correct orange point.

Explanation

Question 19 of 21

Fill the blank spaces to complete the text.

Explanation

Question 20 of 21

Drag and drop to complete the text.

Explanation

Question 21 of 21

What is the name for the bonds found in triglycerides?

Water as solvents:
Water molecules are ❌ so they attract ❌ and polar molecules (such as ❌). Chemical reaction takes place in ❌. Water transports dissolved substances by ❌, in animals, and ❌ (through xylem) and ❌ (through phloem) in plants.

Water as a metabolite:
Water is used in . uses CO2 to produce glucose. needs water to split up a molecule.