Stops infection with the virus / HPV Girls who get the vaccine less likely to get cancer allow kill / destroy virus Lower likelihood that virus spread via sexual contact and so prevent spread cervical cancer even to those who haven’t received the vaccine Qu No. Extra Information Marks 4.1 Vector 1 4.2 destroy the mosquitos 1 prevent the mosquitos from biting people allow use mosquito repellent / nets 1 4.3 14 days 1 Qu No. Extra Information Marks 5.1 immune system becomes severely 1 damaged 1 so white blood cells can no longer destroy the pathogen (unlike a person without HIV) 5.2 Antiretroviral 1 5.3 safer/ no risk of getting the disease 1 it can’t reproduce 1 5.4 parts of the leaf have no chlorophyll / 1 chloroplasts 1 (so) less light is absorbed for 1 photosynthesis 1 (therefore) less glucose made from photosynthesis (and so) less proteins made (from glucose) for growth Question 6.1 Marks A detailed and logical description is given of the stages involved in preparing an agar Level 2 3-4 plate. Logical links are made and scientific terms are used accurately. Discrete, relevant statements are made. The logic may be unclear and links may not Level 1 1-2 be made. No relevant content 0 Indicative content Extra Information Indicative content Pre-inoculation Petri dish and agar sterilised before use to kill unwanted bacteria inoculating loop passed through flame / sterile swab to sterilise / kill (other) bacteria other correct methods, eg bacterial lawns
Stops infection with the virus / HPV Girls who get the vaccine less likely to get cancer allow kill / destroy virus Lower likelihood that virus spread via sexual contact and so prevent spread cervical cancer even to those who haven’t received the vaccine Qu No. Extra Information Marks 4.1 Vector 1 4.2 destroy the mosquitos 1 prevent the mosquitos from biting people allow use mosquito repellent / nets 1 4.3 14 days 1 Qu No. Extra Information Marks 5.1 immune system becomes severely damaged so white blood cells can no longer destroy the pathogen (unlike a person without HIV) 1 1 5.2 Antiretroviral 1 5.3 safer/ no risk of getting the disease it can’t reproduce 1 1 5.4 parts of the leaf have no chlorophyll / chloroplasts (so) less light is absorbed for photosynthesis (therefore) less glucose made from photosynthesis (and so) less proteins made (from glucose) for growth 1 1 1 1 Question 6.1 Marks Level 2 A detailed and logical description is given of the stages involved in preparing an agar plate. Logical links are made and scientific terms are used accurately. 3-4 Level 1 Discrete, relevant statements are made. The logic may be unclear and links may not be made. 1-2 No relevant content 0 Indicative content Extra Information Indicative content Pre-inoculation Petri dish and agar sterilised before use to kill unwanted bacteria inoculating loop passed through flame / sterile swab to sterilise / kill (other) bacteria other correct methods, eg bacterial lawns