# Biology - Advanced Subsidiary - Unit 1 - Lifestyle, Transport, Genes and Health

Topics: DNA, RNA, Heart Pages: 37 (1876 words) Published: December 3, 2012

Candidate Number

Edexcel GCE

Biology
Unit 1: Lifestyle, Transport, Genes and Health
Monday 14 May 2012 – Morning
Time: 1 hour 30 minutes
You must have:
Ruler

Paper Reference

6BI01/01
Total Marks

Instructions
Use black ink or ball-point pen.
centre number and candidate number.
Answer the questions in the spaces provided
– there may be more space than you need.

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. Questions labelled with an asterisk (*) are ones where the quality of your written communication will be assessed
– you should take particular care with your spelling, punctuation and grammar, as well as the clarity of expression, on these questions.
Candidates may use a calculator.

Keep an eye on the time.
Turn over

P39509A

1/1/1/1/C1

*P39509A0124*

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, DNA and RNA, are very important molecules in living organisms. Messenger RNA (mRNA) and transfer RNA (tRNA) are involved in the synthesis of proteins.

For each of the statements (a) to (f ), put a cross
correct statement.

in the box that corresponds to the

(a) DNA and RNA are polynucleotides composed of mononucleotides joined by (1)
A catabolic reactions
B condensation reactions
C hydrolysis reactions
D redox reactions
(b) The mononucleotides of RNA consist of a phosphate joined to the sugar (1)
A deoxyribose
B dextrose
C ribose
D ribulose
(c) The mononucleotides in mRNA are joined together by
(1)
A disulphide bridges
B glycosidic bonds
C hydrogen bonds
D phosphodiester bonds

2

*P39509A0224*

(d) The bases in RNA are
(1)
A adenine, cytosine, guanine and thymine
B adenine, cytosine, guanine and uracil
C adenine, guanine, thymine and uracil
D cytosine, guanine, thymine and uracil
(e) DNA is a double stranded molecule twisted into
(1)
A a beta-pleated sheet
B a double helix
C a triple helix
D an alpha helix
(f ) The two DNA strands are held together by
(1)
A disulphide bridges
C hydrogen bonds
D phosphodiester bonds

*P39509A0324*

3

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(g) Describe the role of each of the following in protein synthesis. (4)
mRNA . ........................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................. ............................................................................................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ ............................................................................................................................... .. . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . ................................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............ ............................................................................................................................... .. . . . . . . . . . . . . . . . . .

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