100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
2023 AQA A-level BIOLOGY 7402/1 Paper 1 Question Paper & Mark scheme (Merged) June 2023 [VERIFIED] £6.54
Add to cart
Quickly navigate to
Preview
  2.  
  3. 2023 AQA AS/ A-level
  4.  
  5. 2023 AQA AS/ A-level

Exam (elaborations)

2023 AQA A-level BIOLOGY 7402/1 Paper 1 Question Paper & Mark scheme (Merged) June 2023 [VERIFIED]

1 review
 0 purchase
  • Module
  • 2023 AQA AS/ A-level
  • Institution
  • 2023 AQA AS/ A-level

2023 AQA A-level BIOLOGY 7402/1 Paper 1 Question Paper & Mark scheme (Merged) June 2023 [VERIFIED] 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 Wednesday 7 June 20...

[Show more]

Preview 4 out of 63  pages

Document information

  • May 14, 2024
  • 63
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

Subjects

  • 2023 aqa a level biology 74021 paper 1 question

Written for

  • 2023 AQA AS/ A-level
  • 2023 AQA AS/ A-level

1  review

review-writer-avatar

By: Brainboost • 8 months ago

Seller

avatar-seller
Kimmey

Reviews received

Content preview

2023 AQA A -level BIOLOGY 7402/1 Paper 1 Question Paper & Mark scheme (Merged) June 2023 [VERIFIED] 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 Wednesday 7 June 2023 Afternoon Time allowed: 2 hours 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. Information For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 10 TOTAL • The marks for the questions are shown in brackets. • The maximum mark for this paper is 91. 2 Answer all questions in the spaces provided. 0 1 . 1 Give the three structural features found in all virus particles and describe the function of one of these features. [2 marks] 1 2 3 Function of one named feature 0 1 . 2Explain why viruses are described as acellular and non -living. [2 marks] 0 1 . 3Give one reason why antibiotics are not effective against viruses. [1 mark] Do not write outside the box 5 *02* IB/M/Jun23/7402/1 3 0 2 . 1 Chitin is a polysaccharide. The chitin monomer is a β -glucose molecule with one OH group replaced by an NHCOCH 3 group. NHCOCH 3 can be represented by N(Ac). Figure 1 shows the monomer that forms chitin and the chitin polymer. Figure 1 Chitin has a similar structure to cellulose. Use Figure 1 to describe three ways the structure of chitin is similar to the structure of cellulose. [3 marks] 1 2 3 Question 2 continues on the next page Turn over ► *03* Do not write outside the box IB/M/Jun23/7402/1 4 0 2 . 2 Chitin keeps the tracheae open in the tracheal system of gas exchange in an insect. Gas exchange does not occur in the tracheae. Explain the importance of one adaptation of the gas exchange surface in the tracheal system of an insect. [2 marks] 0 2 . 3 Lignin is a polymer found in the walls of xylem vessels in plants. Lignin keeps the xylem vessel open as a continuous tube. Explain the importance of the xylem being kept open as a continuous tube. [3 marks] Do not write outside the box 8 *04* IB/M/Jun23/7402/1

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

Quick and easy check-out

You can quickly pay through credit card for the summaries. There is no membership needed.

Focus on what matters

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 Kimmey. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £6.54. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

68175 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 15 years now

Start selling
£6.54
  • (1)
Add to cart
Added