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Explain DNA replication (SL).

DNA replication is the process through which two new strands of DNA are synthesized from the original molecule and predominantly occurs in the S phase of the cell cycle prior to mitosis. To put it simply, we...
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Answered by Jordi M. • Biology tutor
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A ball is fired from a cannon at 20m/s at an angle of 56degrees to the horizontal. Calculate the horizontal distance the ball travels as well as its maximum height reached.

This is a typical mechanics question in an AS/A-level exam and uses the principles of SUVAT and projection. We can try to calculate the maximum height reached first using the veritical components. SUVAT: s=?...
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Answered by Aaron F. • Maths tutor
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How might an uncharged object become positively charged? (e.g. AQA Higher specimen paper 1)

Ask student what causes charge, i.e. motion of electrons. So answer is that electrons move away from the object leaving it positively charged, or move onto a neutral object leaving it negatively charged.
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Answered by Joanna W. • Physics tutor
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Expand and simplify (6x+9)(4x+7)

Using the "crabs claw" or "parrot beak" method, draw lines linking the two brackets (demonstrated on whiteboard) 6x x 4x = 24x 2 6x x 7 = 42x 9 x 4x = 36x 9 x 7 = 63 Answer = 24x 2 + 42x ...
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Answered by Jenna G. • Maths tutor
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How do you deal with 3 simultaneous equations? (Struggling with Q7 of AQA specimen paper 1)

If you need to solve them, then you just plug your way through the algebra to get to the answer. In this question (Q7) you need to find the value of a constant such that there is no solution to the three equ...
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