Unit 1
Where is DNA located?
Nucleus
Does a plant cell have a cell membrane
Yes
Name the two raw materials required for photosynthesis
CO2 and Water
What is a mutation?
A random change to genetic material
How is DNA stored?
In chromosomes
The cell membrane is said to be...... (S.P)
Selectively Permeable
Where does photosynthesis take place?
Chloroplasts
An increased ability to survive and reproduce
What is the name of the single strand of bases that leaves the nucleus to produce proteins?
mRNA
Definition of osmosis
Movement of water molecules from an area of high water concentration to an area of low water concentration, down a concentration gradient across a selectively permeable membrane
What is the by-product of photosynthesis?
Oxygen
State one selection pressure on organisms
Predation, food shortages, disease etc
What replaces thymine in mRNA
Uracil
Active transport moves ______ the concentration gradient
Against
What is passed on from stage one to stage two of photosynthesis?
Name one species in the UK that provides an example of natural selection in action
The peppered moth
If 10% of the bases in a DNA molecule are Adenine, what is the ratio of Adenine to Guanine bases?
1:4
If a potato chunk with sugar concentration of 10% is placed into a 20% sugar solution, what will happen to the potato?
It will get smaller
What does hydrogen bind with in Stage 2?
CO2
A male bird cannot mate with a female bird because the female bird requires the male to complete a complex mating ritual beforehand. The male bird cannot do this successfully. What do we call this type of barrier?
Behavioural