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Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Monday 8 January 2024
Afternoon (Time: 1 hour 30 minutes) Paper
reference WBI11/01
Biology
Advanced Subsidiary
UNIT 1: Molecules, Diet, Transport and Health
You must have: Total Marks
Scientific calculator, ruler, HB pencil
Instructions
• Use black ink or ball-point pen.
• Fill in the boxes at the top of this page with your name,
centre number and candidate number.
• Answer all questions.
• Answer the questions in the spaces provided
– there may be more space than you need.
• Calculators may be used.
• You must show all your working out with your answer clearly identified at the
end of your solution.
Information
• The total mark for this paper is 80.
• The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• The marks available for spelling, punctuation and grammar are clearly indicated.
• structure yourmarked
In questions with an asterisk (*), marks will be awarded for your ability to
answer logically, showing how the points you make are related or
follow on from each other where appropriate.
Advice
• Read each question carefully before you start to answer it.
• Checkanswer
Try to every question.
• your answers if you have time at the end. Turn over
, Answer ALL questions.
Write your answers in the spaces provided.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
Some questions must be answered with a cross in a box . If you change your mind about an
answer, put a line through the box and then mark your new answer with a cross .
1 Red blood cells transport oxygen to the cells of the body.
Read through the following description of how oxygen is transported from the lungs
to respiring cells.
Complete the description by writing the most appropriate word or words on the
dotted lines.
Oxygen binds to . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .................. inside red blood cells.
Oxygen binds to this molecule in the lungs where the partial pressure of
oxygen is . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . compared with elsewhere in the body.
The oxygenated blood returns to the heart in the blood vessel called the
. . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................. and is pumped to the body by the part
of the heart called the . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................................................................... .
In the tissues, the ability of this molecule to bind oxygen is affected by the
higher concentration of carbon dioxide.
This is called the . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .................. effect.
(Total for Question 1 = 5 marks)
2
*P75589A0228*
, 2 The nature of the genetic code of a gene is important in determining the sequence of
amino acids in a polypeptide chain.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
The diagrams show the genetic code for some amino acids and the sequence of
bases in part of a gene.
The genetic code is described as a triplet code that is non-overlapping and
is degenerate.
Explain what each of these phrases means.
Use the information provided to illustrate your answer.
(a) Triplet code
(2)
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