Paper 1 difficult questions Flashcards
1
Q
What is a tissue
A
A group of SIMILIAR cells working together
2
Q
Name the tissue that in plnats that contains stem cells
A
meristem
3
Q
which plant does aspirin originate from
A
willow tree
4
Q
How does salmonella bacteria in food cause the symptoms of vomiting and diarrhoea
A
produces toxins
5
Q
describe two aeseptic techniques to in the culturing microorganism practical
A
passing innoculating loop through flame
taping lid shut
6
Q
what term describes an organsim that passes a pathogen from one person to another
A
vector
7
Q
describe three differences between prokaryotic cells and eukaryotic cells
A
- eukaryotic has DNA in a nucleus whereas prokaryotic cells have DNA in loops in the cytoplasm
- eukaryotic have mitochondria whereas prokaryotic dont
- eukaryotic cells dont have plasmids whereas prokaryotic cells do
8
Q
Describe the process of cell division by mitosis
A
- one set of chromosomes are pulled to each end of the cell
- Nucleus DIVIDES
- cytoplasm and cell membrane divides to form two new cells
9
Q
In the photsynthesis practical
explain whys sodium hydrogencarbonate solution is used instead of water
A
- provides carbon dioxide
-for photosynthesis
10
Q
What are 3 control variables in the osmosis
A
