MC test: Introduction to biochemistry

Multiple choice test on B.1 Introduction to biochemistry

Use the following 'quiz' to test your knowledge and understanding of this sub-topic. As this relates to a sub-topic on the options you may need access to the IB data booklet.

If you get an answer wrong, read through the explanation carefully to learn from your mistakes.

Which are examples of metabolism?

I. Digestion

II. Respiration

III. Photosynthesis

All chemical reactions that take place within living cells are collectively known as metabolism.

 

Which is an anabolic process?

Anabolism involves the use of energy to synthesise larger molecules in living cells.

 

Which is a catabolic process?

Catabolism involves the breakdown of larger molecules in living cells to smaller molecules with the release of energy.

 

What must be true about the monomers used to form condensation polymers?

Monomers may be saturated, e.g. diols, but they must contain at least two reactive functional groups. The reactive functional groups do not have to be hydroxyl groups but may, for example, be amino or carboxyl groups.

 

Which describe the organic product formed when two amino acid molecules undergo a condensation reaction?

I. dipeptide

II. amide

III. protein

A dipeptide contains a peptide bond, −CO−NH−. The class of compounds containing this carboxamide functional group are also known as amides. The formation of proteins involves the condensation of many molecules of amino acids.

 

Which is not a polymer formed by condensation reactions?

Fructose is a simple sugar with the molecular formula C6H12O6. The other three are all macromolecules made from monomers undergoing condensation reactions.

 

What name is given to the type of reaction occurring when proteins are broken down into individual amino acids?

The peptide bond in proteins can be hydrolysed (using enzymes or hydrochloric acid) to form individual amino acids.

 

What is the difference between aerobic and anaerobic respiration?

Aerobic respiration requires a plentiful supply of oxygen to produce ultimately carbon dioxide and water. Anaerobic respiration occurs when the supply of oxygen is limited and involves the conversion of glucose into lactic acid.

 

Which are required for photosynthesis to occur?

I. Carbon dioxide

II. A pigment such as chlorophyll

III. Water

In its simplified form photosynthesis is the conversion of carbon dioxide and water into glucose and oxygen by lightt in he presence of chlorophyll.

 

Which is the simplified equation for respiration?

Respiration is a catabolic process which gives out energy.

 

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