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Biochemistry Worksheet

This document provides a worksheet on biochemistry elements, ions, compounds and water. It includes a diagram of a vertical section through part of a pond labeling different areas. It also includes questions about the properties of water, why water is often referred to as the universal solvent, identifying ions found in pond water samples and their roles, naming compounds that contain phosphate, and classifying different substances as molecules, lipid-soluble, organic, or charged/polar.

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130 views2 pages

Biochemistry Worksheet

This document provides a worksheet on biochemistry elements, ions, compounds and water. It includes a diagram of a vertical section through part of a pond labeling different areas. It also includes questions about the properties of water, why water is often referred to as the universal solvent, identifying ions found in pond water samples and their roles, naming compounds that contain phosphate, and classifying different substances as molecules, lipid-soluble, organic, or charged/polar.

Uploaded by

priyankakhanal1
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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1.

1 BIOCHEMISTRY WORKSHEET 1
TEST YOURSELF: ELEMENTS, IONS, COMPOUNDS AND WATER

1. The diagram below shows a vertical section through part of a pond.

(a) (i) Describe the properties of water that are relevant to descriptions A to D on
the diagram above. [4]

A Surface tension

B transparency

C High latent heat capacity

D Forces adhesion and cohesion

(ii) With reference to the structure and properties of water molecules, explain
why water is often referred to as the universal solvent. [4]

Bonds substabce break


(b) A sample of pond water was analysed. The main mineral ions found in the water are
shown in the table below.

Concentration
Mineral ion
/ mg dm-3
Na+ and K+ 30.1
Ca2+ 56.1
Mg2+ 18.3
Cl- 33.9
SO42- 60.0

(i) Name the following ions: [4]

Needed for formation of proteins. sulphate

Involved in the transport of gases by the blood. chloride

Essential for photosynthesis. magnesium

A lack could disrupt nervous coordination of the body. Na plus k

(ii) Name one other ion not listed above that is required for the transport of
oxygen in vertebrate blood. [1]

iron

(iii) The concentration of phosphate ions was found to be very low in this pond
water. Name three compounds that contain phosphate. [2]

Protein

Atp

Nucleoic acid

(c) Put a cross, X, in the correct boxes in the table below to classify the substances
listed. More than one box can be correct for the same substance. [6]
Lipid- Charged
Substance Molecule Organic
soluble or polar
Magnesium hydrogen carbonate
Mg(HCO3)2
Water
H2O
Calcium ion
Ca2+
Glucose
C6H12O6
Vegetable oil
Methane
CH4

(Total 21 marks)

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