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Describe the chemical composition of phospholipids and how they form cell membranes? (10 marks)

Phospholipids are amphipathic molecules i.e. they have a hydrophilic (“water-loving”), polar head end, and a hydrophobic (“water-fearing”), nonpolar tail end (1 mark). The major phospholipids in most anim...

AB
Answered by Akash B. Biology tutor
6933 Views

Why is it "Ich wohne hier seit 4 Jahren" and not "Ich habe hier seit 4 Jahren gewohnt"?

The latter would seem to make sense, as it is a direct translation of the English "I have lived/have been living here for 4 years", however, when desc...

TB
Answered by Tatyana B. German tutor
5042 Views

What is the difference between a historian and a biographer?

Suetonius represents an example of an ancient biographer. While Suetonius was a Roman, the biographical tradition came from the Greeks and another example can also be found in Plutarch. Ancient biographie...

MS
4797 Views

Express '6cos(2x) +sin(x)' in terms of sin(x).

6cos(2x) +sin(x).Using the double angle formula for cosine (or otherwise), cos(2x) = cos(x)cos(x) - sin(x)sin(x) .cos(2x) = cos^2(x) - sin^2(x) .Hence, 6cos(2x) +sin(x) = 6(cos^2(x) - sin...

RM
Answered by Robbie M. Maths tutor
5394 Views

Find the x and y coordinates of the turning points of the curve 'y = x^3 - 3x^2 +4'. Identify each turning point as either a maximum or a minimum.

The first part of the problem is solved by differentiating once and equating this to zero:
y = x^3 - 3x^2 +4 .dy/dx = 3x^2 - 6x .dy/dx = x(3x - 6...

RM
Answered by Robbie M. Maths tutor
13009 Views

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