2023 AQA AS BIOLOGY 7401/1 Paper 1 Question
Paper & Mark scheme (Merged) June 2023
[VERIFIED]
Candidate number
I declare this is my own work.
AS
BIOLOGY
Paper 1
Monday 15 May 2023 Morning Time allowed: 1 hour 30 minutes
Materials
For this paper you must have:
• a ruler with millimetre...
Please write clearly in block capitals. Centre number Surname Forename(s) Candidate signature 2023 AQA AS BIOLOGY 7401/1 Paper 1 Question Paper & Mark scheme (Merged) June 2023 [VERIFIED] Candidate number I declare this is my own work. AS BIOLOGY Paper 1 Monday 15 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 the top of this page. • Answer all questions. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • 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). • Show all your working. • Do all rough work in this book. Cross through any work you do not want to be marked. For Examiner ’s Use Question Mark 1 2 3 4 5 6 7 8 9 TOTAL Information • The marks for the questions are shown in brackets. • The maximum mark for this paper is 75. *JUN237401101 * IB/M/Jun23/E8 7401/1 2 Answer all questions in the spaces provided. 0 1 . 1 Describe the primary structure of all proteins. [2 marks] 0 1 . 2 This question is about the genetic code. Define universal , non-overlapping and degenerate . [3 marks] Universal Non-overlapping Degenerate *02* IB/M/Jun23/7401/1 Do not write outside the box 5 3 0 2 Figure 1 shows a transmission electron microscope (TEM) image of a Streptococcus bacterium. Figure 1 0 2 . 1 Describe how the appearance of the area containing DNA in a TEM image of a eukaryotic cell would differ from that shown in Figure 1 . [2 marks] 0 2 . 2 Describe one difference between the structure of DNA in a prokaryotic cell and in a eukaryotic cell. [1 mark] Question 2 continues on the next page Turn over ► *03* IB/M/Jun23/7401/1 Do not write outside the box 4 0 2 . 3 Streptococcus bacteria can infect the lungs when air is breathed in and cause lung disease. Describe the mechanism of breathing that causes air to enter the lungs. [3 marks] 0 2 . 4 Some strains of Streptococcus bacteria are more likely to cause lung disease than other strains. Strains that do not cause lung disease are quickly destroyed by phagocytes. Phagocytes are stimulated when they bind to murein on Streptococcus bacteria. Each strain of Streptococcus bacteria has a capsule of different thickness from the others. Suggest how Streptococcus bacteria with a thicker capsule are more likely to survive and so cause lung disease. [2 marks] Do not write outside the box 8 *04* IB/M/Jun23/7401/1
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 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 cate001. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £6.50. You're not tied to anything after your purchase.
