Pearson Edexcel International A Level Biology Paper 1 Question Paper 2023 (WBI11/01: Molecules, Diet, Transport and Health)

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Z:1/1/1/1/Please check the examination details below before entering your candidate information Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Monday 9 October 2023
Morning (Time: 1 hour 30 minutes)WBI11/01Paperreference Total Marks Biology
Advanced Subsidiary/Advanced Level
UNIT 1: Molecules, Diet, Transport and Health
You must have: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 .
• Show all your working out in calculations and include units where appropriate.
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 .• In questions marked with an asterisk (*), marks will be awarded for your ability to structure your answer logically, showing how the points that you make are related or follow on from each other where appropriate.
Advice
• Read each question carefully before you start to answer it.• Try to answer every question.• Check your answers if you have time at the end. *P75615A0228*
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2
Answer ALL questions. Write your answers in the spaces provided.
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 Nucleic acids include DNA and RNA. (a) Read thr
ough the following passage about DNA. Complet
e the passage by writing the most appropriate word or words on the dotted lines.
(5) A strand of DNA is c
omposed of mononucleotides linked by .............................................................. bonds formed during .............................................................. reactions. During this type of reaction a molecule of .............................................................. is also formed. One DNA molecule has tw
o strands of DNA joined together by .............................................................. bonds between complementary base pairs. The DNA molecule then t
wists to form a .............................................................. . *P75615A0328* Turn over 3
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DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA (b) The table shows some components of DNA mononucleotides and RNA mononucleotides and shapes that can be used to represent them.
Component Shapes
bond
thymine T
uracil U
deoxyribose D
ribose R
phosphate Draw one DNA mononucleotide , using shapes selected from those shown in the table.
(3)
(Total for Question 1 = 8 marks)