Monozygotic (identical) twins arise when a single egg, fertilized by a single sperm, divides early in development, giving rise to two genetically identical embryos. A recent study examined two monozygotic twins in which one of the twins had trisomy 21 and the other twin had two normal copies of the 21 chromosome. Explain how two identical twins could differ in their number of chromosomes.

Compare and contrast Gregor Mendel’s scientific method and approach to science (see Chapter 3) with that of Watson and Crick. How did they differ? Where there any similarities?

 x = 15,  is an assignment statement. 

Given variables x, y, and z. x = 25y = x + 5What is y?

  1.1.1 Name two characteristics of money. (2)        

Which of the following is an essential skill for inventory management?

This figure shows how energy changes (Letters) during a chemical reaction WITHOUT an enzyme. If an enzyme WAS present, how would the values of A, B, and C in the diagram change? 

What role does water play in photosynthesis?

  1.1.4 Thandi earns R22967 per month.  Using the information provided, determine how much PAYE tax she will pay in a month. (1)     Right click on the button below to open the information in a new tab:  

Which type of reaction is used to break down ATP into ADP & Pi?