ConceptConceptDocsDocuments

Edexcel IAL Biology 2.6 Amino acids, proteins and protein structure

Complete amino and carboxyl groups accurately, show peptide-bond condensation and trace how sequence and R-group interactions determine final shape and function.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
AS

Exam points

  • Complete amino-acid and peptide diagrams with peptide bonds and condensation products.
  • Distinguish protein-structure levels through bonds, folding and subunits.
  • Relate haemoglobin, collagen or enzyme structure to a stated biological function.

2.6—Amino acids, proteins and protein structure 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 2.6—Amino acids, proteins and protein structure 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 ]
All question bank results loaded