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How is DNA replicated?

DNA replication starts at an origin - eukaryotic chromosomes have multiple origins whereas prokaryotic chromosomes have only one. Here an enzyme called helicase separates the existing ("parental") ...
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Answered by Sarah A. • Biology tutor
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An electron moving at 1000 m/s annihilates with a stationary positron. What is the frequency of the single photon produced?

The first thing to be aware of is that the frequency of a photon will depend on two things, its wavelength (c=fλ ) and its energy (E=hf). There is no information regarding the wavelength of the photon, but w...
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Answered by Lawrence M. • Physics tutor
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Explain how Jay Gatsby personifies the American Dream

Jay Gatsby is a self-made man who pulled himself up out of poverty. However, despite having money, he can never quite fit in with those in East Egg - "old money" families - and meets a tragic end. ...
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Answered by Elena M. • English tutor
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How do I solve simultaneous equations? eg 1) 4x = 16 - 2y and 2) 3x + y = 9

With simultaneous equations it's important to write down all your working so you keep everything clear in your mind and don't get confused. Start by putting all the x and y of both equations on one side. In ...
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Answered by Sarah A. • Maths tutor
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A cannon is fired at 30 degrees from the ground and the cannonball has initial velocity of 15 m/s. What is the height of the highest point the cannonball reaches and how far is this point horizontally from the cannon?

With this type of question always draw a diagram with the values on it. We can assume the positive direction is upwards. Start with considering the vertical motion and use SUVAT. s= ? (this is what we are lo...
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Answered by Elena V. • Physics tutor
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