Paper 1 Flashcards
What is a cell membrane wall
A semi permeable
Which allows what goes in and out of the cell
What is a plasmid
A loop of DNA
What is a cell wall made up of
Cellulose
How does bacteria divide
Thought binary fusion
How many chromosomes does a human cell have
46
Diploid cell
How much chromosomes does a gamete have
23
Haploid cell
Explain Mitosis
Nucleus dissolves and genetic materials is duplicated
2 set of chromosomes move to different sides
Organelles duplicated
Cell divides producing 2 genetically identical diploid cell
What is Osmosis
The diffusion of water across a semi permeable to balance the concentration of solution inside and outside a cell
How can movements of particles rate can be increased
The difference in concentrations
Surface area
Temperature
What is active transport
Movement of particles through a membrane via CARRIER PROTEINS
Require energy
Move them against the concentration gradient
What enzyme does saliva contain
Amylase
What does bile do
Emulsifies LIPIDS to form droplets
Increases surface area
What does the pancreas release and what does it do
Releases Amylase and all enzymes
Breaks down starch into glucose
Where is water absorbed in the body
Large intestine
Where are nutrients absorbed
Small intestine
What are enzymes
Special proteins that act as biological catalyst
Explain Enzyme practical
Mix amylase with starch and start timer
Remove a few drops from mixture every 10 seances and add to iodine
Record time taken for no starch to be detected
Food Test
Starch
Turns Iodine from orange to black
Food test
Sugars
Turn Benedicts from blue to orange
Must be heated
Food Test
Protein
Turns Biuret from Blue to Purple
Food Test
Lipids
Sudan 3
Red fat layer formed
What is double circulatory system
Blood enters heart twice every time it is pumped round body
What does the Pulmonary artery do
Takes un oxygenated blood into the lungs
What is the pulmonary vein
Takes oxygenated blood from the lungs into the heart
