Question 18M.2.SL.TZ1.6c
| Date | May 2018 | Marks available | [Maximum mark: 7] | Reference code | 18M.2.SL.TZ1.6c |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Explain | Question number | c | Adapted from | N/A |
Many diseases are caused by bacteria and other pathogens. Explain, using examples, how other factors can lead to disease in humans.
[7]
Since this question is open-ended here is how it may be marked:
For any non-pathogenic disease being addressed, look for the following components
● name of disease/condition.
● factor/category e.g.: genetic, lifestyle, environmental, psychological, multi-factoral.
● description/symptoms of disease.
● cause of disease.
At least 2 of these qualities must be present to earn any marks for a disease or category/factor
For this question use the unlettered tick. Award 4 MAX if only one condition is explained.
Sample answers:
e.g.
cystic fibrosis
genetic
multiple lung infections/sticky mucus allows opportunistic bacterial infections of lungs / patients lack lipases/cannot digest fat/do not “thrive”
recessive (autosomal) allele / homozygous recessive subjects display cystic fibrosis phenotype / chloride channels are faulty
e.g.
rickets
environmental / lifestyle / nutritional
bones are soft/do not calcify
lack of vitamin D
