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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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Outline how neurons generate a resting potential

Neurons use a sodium potassium pump to maintain a resting potential in the body. Inside a cell normally, there are more sodium in the cell and fewer potassium outside the cell, and hence there is a negati...

Answered by Biology tutor
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How does DNA undergo replication?

Firstly, the enzyme DNA Helicase breaks the hydrogen bonds present between base pairs. This allows the DNA double helix to unravel, exposing the DNA bases. Free DNA nucleotides then bond to the exposed ba...

Answered by Victoria O. Biology tutor
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Define osmosis

The movement of water through a partially permeable membrane.

Answered by Zaynah Q. Biology tutor
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How does adrenaline, using the second messenger model, cause glycogenolysis?

First of all, it is best to understand what glycogenolysis actually is. It is the breakdown of glycogen to form glucose and can be used by the liver to combat low blood glucose levels.
Firstly, adre...

Answered by Biology tutor
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