A person with cardiovascular disease is at risk of a heart attack. A blood clot may form in one of the arteries that supplies blood to the heart muscle. If…

Which two of the following statements about genetic variation are correct?1 Asexual reproduction always produces genetic variation.2 Gamete production is the only possible source of genetic variation in sexual reproduction.3…

The diagram shows some stages involved in genetic engineering. Which row correctly identifies W, X, Y and Z? Answer: 1) E W is a section of the chromosome. It is…

People with cystic fibrosis may be unable to digest their food fully because of thick sticky mucus. This prevents the secretion of pancreatic juices. Doctors sometimes prescribe enzyme supplement medication…

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…

The diagram shows a kidney and its associated vessels from a healthy individual. Which row correctly identifies the vessels along with the concentration of urea they contain. Answer: 1) D…