Biology a/S Edexcel Unit 1 June 2009

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Write your name here Yasitha
Surname Other names De Silva

Centre Number

Candidate Number 0014

Edexcel GCE

Biology
Advanced Subsidiary Unit 1: Lifestyle, Transport, Genes and Health Monday 1 June 2009 – Afternoon Time: 1 hour 15 minutes
You do not need any other materials.
Paper Reference

6BI01/01
Total Marks

Instructions
black ink or • Usein the boxesball-point pen. page with your name, at the top of this • Fill number and candidate number. centre • Answer all questions. in the spaces provided the questions • Answermay be more space than you need. – there

Information
for • The total markeachthis paper is 80.shown in brackets question are • The marks forguide as to how much time to spend on each question. – use this as a ability to information, • You will be assessed on yourclearly andorganise and presentyour use of ideas, descriptions and arguments logically, including



grammar, punctuation and spelling. Candidates may use a calculator.

Advice
carefully • Read each questiontime. before you start to answer it. • Keep an eye on the question. • Try to answer every if you have time at the end. • Check your answers

Turn over

N34463A
©2009 Edexcel Limited.

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1/1/1/

Answer ALL questions. 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 DNA and lipids are important molecules found in living organisms. (a) A triglyceride is one type of lipid. For each of the descriptions below, put a cross ( ) in the box that corresponds to the correct statement about lipids or triglycerides. (i) Triglycerides are composed of: (1) 3 glycerol molecules and 3 fatty acid molecules 1 glycerol molecule and 3 fatty acid molecules 1 glycerol molecule and 1 fatty acid molecule 3 glycerol molecules and 1 fatty acid molecule (ii) The bond between a glycerol molecule and a fatty acid molecule is: (1) A glycosidic bond A peptide bond A phosphodiester bond An ester bond (iii) This bond is formed by: (1) Hydrolysis Condensation A chain reaction An automatic reaction (iv) Unsaturated lipids: (1) Do not have any double bonds Have double bonds only between carbon atoms Have double bonds between carbon atoms and between carbon and oxygen atoms Have double bonds only between carbon and oxygen atoms

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(v) Saturated lipids have: (1) More hydrogen atoms than unsaturated lipids Fewer hydrogen atoms than unsaturated lipids The same number of hydrogen atoms as unsaturated lipids No hydrogen atoms (b) DNA is a double-stranded molecule composed of mononucleotides. (i) In the space below, draw a diagram to show two mononucleotides joined together in a single strand of DNA (polynucleotide). Use the symbols shown below for each component in your diagram. (3) Phosphate group Deoxyribose sugar Base Bond

(ii) Name an enzyme involved in DNA replication. (1)
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(Total for Question 1 = 9 marks)

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2 Cystic fibrosis is a genetic disorder caused by one of a number of possible gene mutations. Prenatal testing can be used to determine whether or not a fetus has cystic fibrosis. (a) Name one method of prenatal testing and explain how it can be used to detect cystic fibrosis. (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
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