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Explain how skeletal muscle contracts.

There are several simple steps that occur each time a skeletal muscle contracts which follow the sliding filament model.
Firstly a nerve impulse travels down a motor neuron releasing neurotransmitte...

Answered by Yuval G. • Biology tutor

7293 Views

Describe the process of transcription in detail (6 marks)

Transcription is the process by which a section of DNA acts as a template for the creation of a complementary mRNA strand. mRNA is needed for the creation of a polypeptide.
An enzyme called DNA heli...

Answered by Katherine H. • Biology tutor

34000 Views

Describe and explain the differences in the function of the sympathetic and parasympathetic nervous systems.

The sympathetic and parasympathetic nervous systems tend to have opposite effects on the organs which are innervated by their nerves. The Sympathetic NS innervates organs via the sympathetic chain and the...

Answered by Amar S. • Biology tutor

4169 Views

Explain the formation of fold mountains (3 marks)

Fold mountains form on convergent (or collision) plate boundaries. They push up layers of accumulated sediment in the sea into folds. Examples are the Himalayas and Andes. The layers of sediment are accum...

Answered by Katherine H. • Geography tutor

16667 Views

There are 11 pens in a box. 8 are black and 3 are red. Two pens are taken out at random without replacement. Work out the probability that the two pens are the same colour.

There are two solutions here which must be found. Both 2 red pens and 2 black pens being selected.
First the red pensIf the total number of pens is 11 and number of red pens is 3, the probability of ...

Answered by Jack R. • Maths tutor

8212 Views