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Which sub-cellular structure controls the activities inside the cell?
Where are proteins made in a cell?
Write down three structures that are found in plant cells but not in animal cells
What is the function of cell sap?
Where is DNA found in a bacterium?
Arrange these structures in order of size:
Bacterium, liver cell, nucleus, ribosome
A nucleus is measured as 0.005mm in diameters. How many micrometres is this?
How many chromosomes are there in each human body cell?
Why is it important that the chromosomes are copied before mitosis takes place?
What is a stem cell?
Why does a plant have a meristem at the tip of the shoot and the tip of each root?
What is required for substances to be absorbed against a concentration gradient?
Why do cells differentiate?
Why do sperm cells contain a lot of mitochondria?
What is a group of cells with a similar structure and function called?
What is the function of epithelia?
Is the heart, a tissue, an organ or an organ system?
What type of molecule is an enzyme?
Give two factors that affect the rate at which enzymes work?
What type of enzyme breaks down lipids?
Where are protease enzymes produced in the body?
Where is bile produced?
Which component of blood makes it clot?
How are red blood cells adapted to carry oxygen?
What type of blood vessel carries blood away from the heart?
In which chamber does deoxygenated blood enter the heart?
What do the heart and veins contain to prevent backflow of blood?
State whether each of these diseases are communicable or non-communicable.
a)flu
b)Scurvy
c)lung cancer
hy can spending too long in the sun result in skin cancer?
Give one risk for type two diabetes.
