GCSE Flashcards
What is the role of a valve
To prevent back flow of blood
Why is the heart known as a double pump
It pumps blood to the lungs once.
It pumps blood to the body once
What do you use to test for protein
Biuret
How do you test for sugars
Add Benedict’s then heat in water bath
How do you test for starch
Add iodine
Starch=positive
Iodine= ?
Blue/black
Sugar=positive
Benedict’s= ?
Yellow-green-red
Protein=positive
Biuret= ?
Purple
How do you test for lipids
Use filter paper
Lipid=positive
Filter paper= ?
Transparent
What is the role of bile?
Converts food leaving the stomach into an acid/alkaline
Where is bile produced?
Liver
Where is bile stored?
Gall bladder
Function of plasma
A liquid that transports to other blood components
Platelets function?
Cell fragments essential to blood clotting
White blood cells function
Defence the body against disease
Red blood cells function
Transport oxygen (no nucleus for more space)
What is stage 1 of the cell cycle
Cell growth (DNA replicates- 2 copies of each chromosome form)
What is stage 2 of the cell cycle
Mitosis- the nucleus divides
What is stage 3 of the cell cycle
Cell division- cytoplasm divides to form 2 genetically identical chromosomes (daughter cells)
Explain briefly therapeutic cloning
- nucleus from body cell gets put into empty egg cell
- egg cell divides and grows into embryo
- stem cells are grown
What is the photosynthesis equation?
CO2 + water ———> glucose + oxygen
Light
Name 1 factor affecting the rate of photosynthesis
Temperature
Where is the pacemaker
Right atrium
