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Edexcel A-Level Biology AS 2.6 Amino Acids Proteins and Protein Structure Questions

Complete amino and carboxyl groups accurately, show peptide-bond condensation, and explain how sequence, bonding and R-group interactions determine protein shape, solubility and function.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
AS

Exam points

  • Describe amino acids, peptide bonds and condensation or hydrolysis reactions in protein formation.
  • Explain primary, secondary, tertiary and quaternary protein structure through sequence, bonds, folding and R-group properties.
  • Relate protein structure to solubility and biological function using haemoglobin, collagen, enzymes and channel proteins.

Edexcel A-Level Biology AS 2.6 Amino Acids Proteins and Protein Structure Questions question 1

[Maximum number: 3]

The butterfly is an insect that feeds on nectar produced by flowers.
The photograph shows a butterfly feeding on a flower.

Figure for Question Edexcel A-Level Biology AS 2.6 Amino Acids Proteins and Protein Structure Questions question 1 — Edexcel A-Level Biology AS

Question (a)

(a)

The nectar in flowers contains nutrients including sugars, amino acids and lipids.

[ 1 ]

Question (i)

(i)

Which row of the table describes how amino acids are joined together to form a protein?
□ A
□ B
□ C
□ D

Table for Question (i) — Edexcel A-Level Biology AS
[ 1 ]

Question (b)

(b)

The circulatory system of an insect is described as an open system. This means that the blood is not contained inside blood vessels but flows through cavities called sinuses.

The diagram shows part of the circulatory system of an insect.

Conducting vessel: blood flows out of the

Figure for Question (b) — Edexcel A-Level Biology AS
[ 2 ]

Question (i)

(i)

The blood flowing through the sinuses of the butterfly is separated from the organs by collagen.

Describe the structure of collagen.

[ 2 ]
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