Paper 1 errors

Question 1

Explain the effect of a partly blocked coronary artery on the human body

Answer 1

• Reduced blood flow to heart
• so less glucose to heart + oxegen
• less arobic resperation in heart so less energy realesed
• so less muscle contraction
• less oxegen in body so tiredness

Question 2

Why do scientist incubate bacteria at 37 degrees when schools incubate at 25

Answer 2

37 degress is body temp + bacteria grow better at 37 degress

at 25 degress lower chance of growth of bacteria that is harmful to humans

Question 3

One year later anti biotic B did not have the same effect

Answer 3

Bacteria gained a resistance

Question 4

antibiotcs work by destroying cell wall

Answer 4

water enters cell through osmosis

since incomplete cell can not withstand pressure

Question 5

Two effects of anaerobic resperation on a human

Answer 5

• muscle debt occurs because of the build up of latic acid
• Weaker muscles less energy avaliable

Question 6

Differences between sexual reproduction and asexual reproduction

Answer 6

involves fertilisation for sexual

involves (only) meiosis and only mitiosis

more energy required for sexual reproduction

Question 7

Describe how scienctist make monoclonal antibodies using a hybridoma

Answer 7

• Cell is cloned
• all the cells make the same antibody
• antibody is collected and purified