PEARSON EDEXEL A LEVEL BIOLOGY B PAPER 1 2024 MARK SCHEME (8BI0/01: Core Cellular Biology and Microbiology
0 view 0 purchase
Course
PEARSON EDEXEL A LEVEL BIOLOGY
Institution
PEARSON EDEXEL A LEVEL BIOLOGY
Glucose isomerase is intracellular enzyme that.
enzyme converts glucose into fructose which is a much sweeter carbohydrate.
(a)
Explain how proteins like glucose isomerase made in cells?
(5 marks) - answer-( careful mention process of DNA unwinding )
DNA = unzips ===>
break H-bo...
PEARSON EDEXEL A LEVEL BIOLOGY B PAPER
1 2024 MARK SCHEME (8BI0/01: Core Cellular
Biology and Microbiology
Glucose isomerase is intracellular enzyme that.
enzyme converts glucose into fructose which is a much sweeter
carbohydrate.
(a)
Explain how proteins like glucose isomerase made in cells?
(5 marks) - answer-( careful mention process of DNA unwinding )
DNA = unzips ===>
break H-bonds --> use DNA helicase
transcription,
make mRNA, RNA polymerase, CBPairing
(ii)
Explain why some bases in gene do not code for amino acids?
(2 marks) - answer-some start + stop codons
some = introns
Analyse data to explain
rate of breakdown of amylopectin + amylose by amylase?
(4 marks) - answer-rate of amylopectin faster than rate of amylose
active site of amylase
> complementary to amylopectin than amylose
amylopectin ==>
side branches + > glycosidic bonds
, all amylopectin hydrolysed by 2.5 minutes
Artificial liposomes spheres with
outer layer of phospholipids filled with a cytotoxic solution of drugs that kill
cancer cells.
cancer tumour damage capillaries +
increase normal pore size.
also cause temperature of nearby tissue to rise above normal body
temperature.
Explain advantage of treating cancer with artificial temperature-sensitive
liposomes contain cytotoxic drugs?
(5 marks) - answer-reduce need of other treatments
such as radiotherapy
remain stable in circulation at 37°C
Which of following shows correct number of cancerous cells would be after
a single cell carries
out six mitotic cell divisions?
( 1 marks ) - answer-A
Predict total mass of DNA after six cell cycles
(2 marks) - answer-show working out:
Pattern is
DNA total mass = doubled for each cycle
mass of DNA for
5 cycles = 32,
mass of DNA for 6 cycles = 64 (1)
Cycle 1 mass = 2, cycle 2 = 4, cycle 3 = 8,
cycle 4 = 16 (1)
Time in colorimeter/s ++ Mean absorbance units
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 karimikelvin92. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $24.99. You're not tied to anything after your purchase.
