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Paper 3 biology paper 2024 revision questions and correct marking scheme of the year, Exams of Nursing

Describe how pacing corpuscle produces generator potential 3 marks - Correct Answers Stretch mediated sodium ion channels, Sodium channels open, Sodium ions diffuse in All or nothing principle 2 marks - Correct Answers Action potential only generated when threshold is reached, High pressure is above stimulus, Time period between 0.6 and 4.0 1 mark - Correct Answers refractory period Two variable to control in respiration yeast experiment 1 mark

Typology: Exams

2024/2025

Available from 01/17/2025

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Paper 3 biology paper 2024 revision questions and correct marking scheme of the year

Describe how pacing corpuscle produces generator potential

3 marks - Correct Answers Stretch mediated sodium ion channels,

Sodium channels open,

Sodium ions diffuse in

All or nothing principle

2 marks - Correct Answers Action potential only generated when threshold is reached,

High pressure is above stimulus,

Time period between 0.6 and 4.

1 mark - Correct Answers refractory period

Two variable to control in respiration yeast experiment

1 mark - Correct Answers Mass of glucose,

Mass of yeast

Yeast rate of co2 production

2 marks - Correct Answers 2.5 x10-

Why was yeast slower in maltose over glucose?

2 marks - Correct Answers maltose is disaccharide,

Hydrolyzed into glucose

Method of respiration less accurate because? This could be improved by-

2 marks - Correct Answers Less accurate - colour is subjective

Improved by - have a colour standard of the yellow as a reference for the end point

Link reaction, A B C D

2 marks - Correct Answers A-Pyruvate

B-NADH C-Coenzyme A

D-acetyl coenzyme A

Prokaryote tick box

1 mark - Correct Answers second Box

Mean no of bacteria in culture - Correct Answers 9.144x 10 to power of 8

Log question to bacteria one

1 mark - Correct Answers 30 generation

Two reasons why bacteria could grow in culture containing chloramphenicol

2 marks - Correct Answers Concentration was too low to kill all,

Mutation

How is SCFR destroyed by lysosome?

2 marks - Correct Answers Vesicle binds with a lysosome,

Lysosomes digest SCFR

Diversity of fish formula year’s value

1 marks - Correct Answers 1982 and 2003

Describe and explain 1997 results

2 marks - Correct Answers 1997 had highest no of species,

However few species were present in very large numbers

Why journalist conclusion on power station might not be valid

4 marks - Correct Answers species richness lower after 29 years,

Data only for one fish community,

Other communities may have different fish species,

Volume of heated water may have varied

Two types of cell that can stimulate immune response

2 marks - Correct Answers Pathogens ,

Abnormal body cells

Why olive oil applied to left ear of the mice

1 mark - Correct Answers as control experiment to show its OXA affecting immune response

What can you conclude about effects of autoimmune disease on cellular response and humoral response in male and female mice

3 marks - Correct Answers Cellular - female to female no as in cellular response as SD overlap

Male to male no significant difference in cellular response as SD overlap

Humoral- male to male no SD in humoral response as SD overlap

Oestrogen effect on autoimmune disease

4 marks - Correct Answers for -

Oestrogen increase humoral response that produce antibody,

More antibodies could increase progression of SLE

Fewer Tc cells could slow progression of RA

Against -

Increase in response might mean quicker production of antibody

Hardy weindburg explain question

2 marks - Correct Answers no as nice with autoimmune disease will be unlikely to reproduce,

Will not pass on allele