100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
OCR A Level Biology A H420/01 Biological processes June 2024 Exam Question paper Authentic Marking Scheme Attached $8.99   Add to cart

Exam (elaborations)

OCR A Level Biology A H420/01 Biological processes June 2024 Exam Question paper Authentic Marking Scheme Attached

 17 views  0 purchase
  • Course
  • OCR A-LEVEL BIOLOGY
  • Institution
  • OCR A-LEVEL BIOLOGY

OCR A Level Biology A H420/01 Biological processes June 2024 Exam Question paper Authentic Marking Scheme Attached

Preview 4 out of 65  pages

  • May 29, 2024
  • 65
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers
  • OCR A-LEVEL BIOLOGY
  • OCR A-LEVEL BIOLOGY
avatar-seller
RevisionKing
Oxford Cambridge and RSA

Thursday 9 June 2022 – Afternoon
A Level Biology A
H420/01 Biological processes
Time allowed: 2 hours 15 minutes

You must have:
* 9 0 9 5 7 8 7 9 7 0 *




• the Insert (inside this document)
You can use:
• a ruler (cm/mm)
• a scientific or graphical calculator




* H 4 2 0 0 1 *




Please write clearly in black ink. Do not write in the barcodes.

Centre number Candidate number


First name(s)

Last name


INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.

INFORMATION
• The total mark for this paper is 100.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 32 pages.

ADVICE
• Read each question carefully before you start your answer.




© OCR 2022 [601/4260/1] OCR is an exempt Charity
DC (ST/CT) 301310/5 Turn over

, 2
SECTION A

You should spend a maximum of 20 minutes on this section.

Write your answer to each question in the box provided.

Answer all the questions.

1 Which statement describes the properties or functions of cholesterol?

A It increases the fluidity of the phospholipid bilayer at high temperatures.

B It is an unsaturated fatty acid because it contains carbon–carbon double bonds.

C It is used to produce some hormones.

D It is very hydrophilic so is attracted to the fatty acid tails in the membrane.

Your answer [1]



2 Which statement describes triglycerides?

A They are broken down by condensation reactions.

B They are polymers of glycerol and fatty acids.

C They contain ester bonds.

D They contain glycosidic bonds.

Your answer [1]



3 Kendal Mint Cake is made from sugar, flavoured with peppermint, and was famously taken on the
1953 ascent of Mount Everest.

Which statement describes why climbers now prefer to take chocolate?

A Chocolate contains fat. Fat stores and releases less energy per gram than sugar.

B Chocolate contains fat. Fat stores and releases more energy per gram than sugar.

C Fat contains more oxygen than glucose.

D Glucose can be digested more rapidly than fat.

Your answer [1]




© OCR 2022

, 3
4 The graph below shows the effect of changing substrate concentration on the rate of an enzyme-
controlled reaction.




Rate of
reaction



Substrate concentration

Which graph shows how increasing the concentration of enzyme would affect the rate of this
reaction?

A B



Rate of Rate of
reaction reaction



Substrate concentration Substrate concentration


C D



Rate of Rate of
reaction reaction



Substrate concentration Substrate concentration



Your answer [1]




© OCR 2022 Turn over

, 4
5 Which statement about the effect of temperature on enzyme-controlled reactions is not correct?

A At temperatures above 40 °C the rate of all enzyme-controlled reactions decreases.

B Increasing the temperature above the optimum changes the tertiary structure of the active
site.

C Increasing the temperature increases the kinetic energy of the enzyme and substrate.

D Increasing the temperature increases the probability of enzyme-substrate collisions.

Your answer [1]



6 Ventilation of the lungs involves muscles working together.

Which option describes expiration?

A In expiration at rest, the external intercostal muscles and the diaphragm relax and the rib
cage moves down and in.

B In expiration at rest, the internal intercostal muscles and the diaphragm contract pulling the
rib cage down and in.

C In forced expiration, the diaphragm relaxes and the external intercostal muscles contract
pulling the rib cage down and in.

D In forced expiration, the internal intercostal muscles and the diaphragm contract pulling the
rib cage down and in.

Your answer [1]



7 Which option is not a component of a chloroplast?

A Cristae

B DNA

C Ribosome

D Thylakoid

Your answer [1]




© OCR 2022

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 or Stuvia-credit 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 RevisionKing. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $8.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

77764 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$8.99
  • (0)
  Add to cart