Exam (elaborations)
Biology unit 1 Molecules, Diet, Transport and Health 2020 edexcel paper
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Please check the examination details below before entering your candidate informationCandidate surname Other names
Pearson Edexcel Centre Number Candidate Number
International
Advanced Level
Thursday 7 May 2020
Morning (Time: 1 hour 30 minutes) Paper Reference WBI11/01
Biology
International Advanced Subsidiary / Advanced Level
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.
• centre
Fill in the boxes at the top of this page with your name,
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 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.
• toIn questions marked with an asterisk (*), marks will be awarded for your ability
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.
Turn over
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©2020 Pearson Education Ltd.
1/1/1/
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, 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 The primary structure of a protein determines its secondary structure and its
three‑dimensional structure.
(a) Read through the following account of the primary structure of a protein.
(5)
Complete the account by writing the most appropriate word or words on the
dotted lines.
The primary structure of a protein is the specific sequence of amino acids joined
together by . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................................................ bonds.
These bonds are formed between the .............................................................................................. group of
one amino acid and the . . . . . . . . . . . . . . ................................................................................ group of an adjacent
amino acid by a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ......................................................... reaction.
These bonds are formed during the stage of protein synthesis
called . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................................ .
(b) The table describes the types of bond that hold the secondary and the
three‑dimensional structures together.
Which type of bonding is true for each structure?
(2)
Hydrogen Ionic Both hydrogen Neither of
Structure
bonds only bonds only and ionic bonds these bonds
secondary structure
three‑dimensional structure
(Total for Question 1 = 7 marks)
3
*P62456A0332* Turn over
, 2 Most Bengal tigers are orange with black stripes but there is a very small number of
Bengal tigers that are white with black stripes.
The photograph shows a white Bengal tiger with black stripes.
(Source: Caroline Wilcox)
White tiger offspring are produced by two Bengal tigers that each carry at least one
recessive allele for a gene affecting coat colour.
The pedigree diagram shows the phenotypes in one family of tigers, bred in captivity.
Key
female orange tiger
female white tiger
male orange tiger
male white tiger
(a) The phenotype is affected by the genotype.
State what is meant by the term genotype.
(1)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
4
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