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Meselson & Stahl grew E. coli cells in a dense N15 nitrogen medium, then transferred to a lighter N14 nitrogen medium. Describe the observations of their experiment (until the third generation) and use it to explain the mechanism of DNA replication.

Observations:- After each generation, the amount of DNA will be doubled during the S phase of interphase- At the start, all DNA will be labelled N¹⁵- In...

Answered by • Biology tutor

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'British society remained the same in the years 1951 to 1964.' Assess the validity of this view.

Introduction - It can be considered naive to claim that British society remained the same in the years 1951-64 with numerous changes, both on a demographic level but in terms of people's attitudes of the ...

Answered by Danielle M. • History tutor

5102 Views

A group of 5 people order 2 8 inch pizzas, with heights 2cm and 1cm, and density 3/pi g/cm^3, and 5/pi g/cm^3 respectively. If they divide each pizza evenly, how much pizza, in grams, does each person eat? Use 1 inch = 2.5 cm.

This is a slightly advanced GCSE question, involving multiple steps. Each step is quite simple however.First, set out the known variables. Note that the 8 inches is the pizza diameter.r = 8*2.5/2 = 20/2 =...

Answered by Ibrahim Q. • Maths tutor

2787 Views

Solve the following simultaneous equations: 3x + y = 11, 2x + y = 8

This problem can be solved by using elimination.Label 3x + y = 11 as equation (1) and 2x + y = 8 as equation (2).We first want to eliminate one of the variables so that we can then reach a value for the o...

Answered by Oscar D. • Maths tutor

4247 Views

How can I find the correct list of solutions whilst solving a trigonometry equation?

If you are unsure of the number of solutions to an equation, it is always best to start with a diagram. By drawing a diagram then marking out the boundaries specified in the question, it is easy to visual...

Answered by Owen C. • Maths tutor

2860 Views