AQA
AS
BIOLOGY
Paper 2
Thursday 25 May 2023 Morning Time allowed: 1 hour 30 minutes
Materials
For this paper you must have:
• a ruler with millimetre measurements
• a scientific calculator.
Instructions
• Use black ink or black ball-point pen.
• Fill in the boxes at t...
Thursday 25 May 2023 Morning Time allowed: 1 hour 30 minutes
Materials
For this paper you must have: For Examiner’s Use
a ruler with millimetre measurements
Questio Mark
a scientific calculator. n
1
Instructions 2
Use black ink or black ball-point pen.
Fill in the boxes at the top of this page. 3
Answer all questions. 4
You must answer the questions in the spaces provided. Do 5
not write outside the box around each page or on blank
6
pages.
7
If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s). 8
Show all your working. 9
Do all rough work in this book. Cross through any work you do
10
not want to be marked.
TOTAL
Information
The marks for the questions are shown in brackets.
The maximum mark for this paper is 75.
1
, 2
Do not write
outside the
Answer all questions in the spaces box
provided.
0 1 .1 Which statement about the function of ribosomes is
correct?
Tick () one box. [1 mark]
Site of transcription, catalyse the joining of amino acids by
hydrolysis reactions
Site of transcription, catalyse the joining of
nucleotides by condensation reactions
Site of translation, catalyse the joining of amino
acids by condensation reactions
Site of translation, catalyse the joining of nucleotides by
hydrolysis reactions
0 1
.2 Name two biological molecules that can be coded for by
a gene. Do not include a polypeptide or protein in your
answer.
[1 mark]
1
2
*02
IB/M/
* Jun23/7401/2
, 3
Do not write
outside the
0 1 .3 Scientists investigated the structure of the endoplasmic reticulum. box
Table 1 shows some of the scientists’ results.
Table 1
Percentage of endoplasmic
Type of endoplasmic reticulum
reticulum made of phospholipids
Rough 46.
8
Smooth 52.
5
Use the data in Table 1 to suggest how the structure of rough endoplasmic
reticulum is different from the structure of smooth endoplasmic reticulum
and how this is related to their functions.
[3 marks]
5
Turn over for the next question
Turn over ►
*03
IB/M/
* Jun23/7401/2
, 4
Do not write
outside the
0 2 .1 Figure 1 shows an ATP synthase enzyme in the inner mitochondrial box
membrane.
Figure 1
Complete the passage with the appropriate terms.
[2 marks]
ATP synthase comprises several polypeptides, so is said to have
a structure.
It catalyses the synthesis of an ATP molecule by a
reaction; this involves the of a water molecule.
The ATP synthase in Figure 1 is in a mitochondrion so would catalyse
reactions
during .
*04
IB/M/
* Jun23/7401/2
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 bestgradesA33. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.89. You're not tied to anything after your purchase.
