Cada pergunta deste Quiz é cronometrada.
In a typical animal cell the structure includes mitochondria, cell wall, cell membrane, nucleus and cytoplasm.
A virus cell contains RNA and DNA.
What does it mean when a plant is turgid?
The water has moved out the cell by osmosis, the cell decreases in volume and the cytoplasm no longer pushes against the cell wall. This makes the plant wilt. Excessive loss of water can cause the cell to become plasmolysed, when the membrane and cytoplasm split away from the wall
Water has moved into the plant cell by osmosis. The pressure increases inside the cell, the contents of the cell push against the wall which helps support the plant tissues.
What factors affect the rate of diffusion/active transport/osmosis in cells?
concentration, surface area to volume ratio, temperature
pressure, temperature, concentration
what is the word equation for photosynthesis?
Carbon dioxide + water ----> glucose + oxygen
oxygen + carbon dioxide + water ----> glucose + oxygen
What are lipids made of?
amino acids and glycerol
fatty acids and glycerol
How can you test for Glucose?
Add iodine, if glucose in present the colour changes from browny-orange to blue-black
Add benedicts reagent and heat it, if glucose is present it will form a colours precipitate. The coloured precipitate changes colour from blue to green to yellow to orange to brick red.
What is the function of bile in the human body?
emulsifies fats and neutralises stomach acid into alkaline
neutralises stomach acid and helps protect lining of stomach
Amylase converts starch into maltose.....and maltase converts maltose into?
Glucose
Amino acids
