Common Task 2 Revision (Stem cells (Plant stem cells are found in…
Common Task 2
Plant stem cells are found in meristems in roots and cambium in stems
Change in DNA can cause uncontrolled cell division
Adult stem cells can only become one type of tissue
Uncontrolled cell division -cancer
Embryonic stem cells can differentiate and specialise into any kind of cell
Uses of stem cells?
Can divide often by mitosis and differentiate
Issues with stem cells?
Unspecialised cell-can become any cell
Types of neurones
Health & Disease
Types of pathogens:
watery faeces, diarrhoea
lesions on bark
Ways pathogens spread?
What is a vector?
Organism that carries pathogens from one organism to another e.g. mosquito
What is an STI/ Give two examples
sexually transmitted infection e.g. chlamydia, HIV- condoms protect us, screening identifies
Chemical barriers to pathogens?
Physical barriers to pathogens?
lymphocytes release antibodies in response to antigens
weakened form of pathogen
memory lymphocytes release antibodies in the future when a new infection occurs-secondary response