IB Biology SL B1.2 Proteins Topic Practice

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Study B1.2 Proteins conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

Question 1

[Maximum number: 1]

The diagram shows the molecular structure of the amino acid leucine.

Figure for Question 1 — IB Biology SL

Draw a circle on the diagram to enclose the carboxyl group.

Question 2

[Maximum number: 2]

A short base sequence of mRNA and a table of the genetic code are shown below.
Sequence of mRNA
AUGAGCCGAAGGUAGCUG
Table of the genetic code

Table for Question 2 — IB Biology SL

Question (a)

(a)

The diagram shows a section of a polypeptide.

Figure for Question (a) — IB Biology SL
[ 2 ]

Question (i)

(i)

Annotate the diagram to show a peptide bond between two amino acids.

[ 1 ]

Question (ii)

(ii)

State the type of reaction that removes water while linking amino acids together to form polypeptides.

[ 1 ]

Question 3

[Maximum number: 2]

Some of the twenty amino acids that are linked together to make polypeptides in human cells are essential in the diet and others are not. Distinguish between essential and non-essential amino acids.

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