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The Polar Bear is the largest species of bear in the world. With regards to adaptation, suggest a reason for this.

The habitat of the Polar Bears is the arctic. This is a much colder climate than the other species of bear found in the wild. Therefore the Polar Bear has adapted to live in this colder climate. One adaptati...
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Answered by Zia F. • Biology tutor
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Examine the presentation of the male characters in Mary Shelley's Frankenstein

Shelley presents her protagonist Victor Frankenstein as being entirely innocent throughout his youth, as he claims about his parents, 'I was their plaything- their child, the innocent and helpless creature.....
GI
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How are impulses propagated along an axon?

The axon is polarised at rest. This means that there is a negative charge within the axon and a positive charge outside. This resting polarisation is caused by a Na/K pump that uses active transport to trans...
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Answered by Zia F. • Biology tutor
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Describe and explain the process of protein synthesis. (6 marks)

Transcription is the first step of protein synthesis. This involves DNA helicase unwinding the double stranded DNA, and complementary mRNA binding to the DNA bases with the help of the DNA polymerase. DNA li...
BS
Answered by Ben S. • Biology tutor
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A 950 kg car accelerates from 0 to 33 m/s in 11 seconds. a) Calculate the acceleration of the car b) Calculate the force needed to produce this acceleration c) The car claims a top speed of 110 miles/hr. Explain why there must be a top speed for any car

a) a=v-u/t = 33/1 = 3 b) F = ma = 950x3 = 2850 c) Friction and air resistance increases with speed, till frictional = max forward force, then force/acceleration is zero
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Answered by Raina B. • Physics tutor
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