AQA A LEVEL BIOLOGY PAPER 1
2021. Describe the induced-fit model based on enzyme action and how an enzyme acts as a
catalyst.
[3 marks]
. 2 Scientists investigated the action based on the enzyme ATP synthase. They made reaction
mixtures each containing:
• ATP synthase
• buffer (to contr...
Downloaded by: nurse001 | kelvingithinji001@gmail.com
Distribution of this document is illegal
, Stuvia.com - The Marketplace to Buy and Sell your Study Material
AQA A LEVEL BIOLOGY PAPER
1 2021
Downloaded by: nurse001 | kelvingithinji001@gmail.com
Distribution of this document is illegal
, Stuvia.com - The Marketplace to Buy and Sell your Study Material
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
BIOLOGY
Paper 1
Time allowed: 2 hours
Materials For Examiner’s Use
For this paper you must have:
• a ruler with millimetre measurements Question Mark
• a scientific calculator. 1
2
Instructions
3
• Use black ink or black ball-point pen.
• Fill within the boxes at the top based on this page. 4
• Answer all questions. 5
• You must answer the questions within the spaces provided. Do not write 6
outside the box around each page or on blank pages.
7
• If you need extra space for your answer(s), use the lined pages at the end based on
this book. Write the question number against your answer(s). 8
• Show all your working. 9
• Do all rough work within this book. Cross through any work you do not wantto
10
be marked.
TOTAL
Information
• The marks for the questions are shown within brackets.
• The maximum mark for this paper is 91.
Downloaded by: nurse001 | kelvingithinji001@gmail.com
Distribution of this document is illegal
, Stuvia.com - The Marketplace to Buy and Sell your Study Material
2
Do not write
outside the
. box
0 1 . 1 Describe the induced-fit model based on enzyme action and how an enzyme acts as a
catalyst.
[3 marks]
0 1 . 2 Scientists investigated the action based on the enzyme ATP synthase. They made reaction
mixtures each containing:
• ATP synthase
• buffer (to control pH)
• substrates.
One based on the substrates required within these reaction mixtures is inorganic phosphate (Pi).
Tick ( ) one box to show which other substrate the scientists must add to the reactionmixtures
to produce ATP.
[1 mark]
Adenine
Adenosine diphosphate
Glucose
Ribose
*02* Downloaded by: nurse001 | kelvingithinji001@gmail.com
IB/H/Jun21/7402/1
Distribution of this document is illegal
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Tutorexpert01. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $6.00. You're not tied to anything after your purchase.
