Top answers

What do I need to do to write an A* essay?

The key skill you need to display is an in-depth knowledge of the text. This means you should be able to back up every point you make with at least one quote from the text, and you should use AO2, 3 & 4 ...
CC
5180 Views

Maltose is hydrolysed by the enzyme maltase. Explain why maltase catalyses only this reaction.

The enzyme maltose will always fold into in a tertiary structure, which results in the active site being in a specific shape that only the substrate maltase can bind to. This is often illustrated using the a...
PS
Answered by Philippa S. • Biology tutor
27660 Views

Describe how the rhythmicity of the heart is established and maintained with respect to the different stages in the cardiac cycle (6 marks)

The Sinoatrial Node (SAN) generates the wave of excitation/ Action potential (AP). The AP spreads across the atrial walls, stimulating the myocardial cells to contract This initiates the atrial systole. The ...
HM
Answered by Haider M. • Biology tutor
6981 Views

At x=3, is the polynomial y= (4/3)x^3 -6x^2 + 11 at a maxima or minima?

First, take the first differential: y' = 4x^2 -12x. At x=3 y'= 0 so therefore the function is at a point of inflection. Taking the second derivative: y'' = 8x -12. At x=3 y''= 12. As 12 is greater than 0, th...
JT
Answered by James T. • Maths tutor
4308 Views

What factors influence the reaction rate?

There are 5 main factors that affect the rate of reaction. 1. Concentration: Increasing the concentration increases the frequency of collisions between particles. 2. Surface Area: Increasing the surface area...
JT
Answered by James T. • Chemistry tutor
3682 Views