SCID is an inherited condition in humans. People with some types of SCID are unable to make a functional enzyme necessary for the production of healthy white blood cells. A…

Which one of the following is equivalent to (√5 – 2)²? Answer: 4) F (√5 – 2)²Using the (a – b)² = (a² + b² – 2ab) rule, (√5)² +…

Below are four statements about electromagnetic waves.1 Microwaves have a smaller wavelength than visible light.2 The speed of visible light in a vacuum is higher than the speed of other…

The diagram shows an electrolysis experiment. Which reaction occurs at the anode and which reaction occurs at the cathode for this experiment? Answer: 2) E You must first know what…

The diagram shows a section through part of a healthy human. Which row in the table shows the correct secretions from P, Q and R? Answer: 1) A P is…

Light travels through glass at a speed which is 2/3 of its speed through air.Light travels through water at a speed which is 3/4 of its speed through air.A ray…

The gases X and Y react with each other to produce gas Z according to the equation: 2X(g) + Y(g) → 2Z(g) 100 cm3 of X was mixed with 10…

An experiment was carried out to investigate a gene for coat colour in mice. The diagram shows the results of three crosses between different mice, producing three different families, P,…

Some blood is found at a crime scene. The police know that it belongs to the one criminal involved. A person’s red blood cells can have type A antigens, type…

An object that has a weight of 15 N on Earth is taken to a planet where it has a weight of 3.0 N.The planet has no atmosphere. Which line…