Top answers

Simultaneous Equation: 3x + y = -4 / 3x - 4y = 6

Route 1 (Standard): 1. 3x + y = -4 / 2. 3x - 4y = 6 / MINUS 2 FROM 1 / y - (-4y) = 5y / -4 - 6 = - 10 / 5y = - 10 / y = -2 /PUT y-VALUE BACK INTO ORIGINAL EQ / 3x - 2 = -4 / 3x = - 4 + 2 / 3x = -2 / x = - 2/...
Answered by • Maths tutor
4481 Views

Explain how an adult develops immunity to a bacterial toxin

When the body is exposed to a bacterial toxin for the first time, it is recognised as foreign and an immune response will be mounted. In response to the toxin, B lymphocytes will be produced which make antit...
Answered by • Biology tutor
3988 Views

Why could a single base mutation stop an enzyme from catalysing a reaction?

Because the single base mutation would change the primary structure of the enzyme which in turn would change the secondary structure of the enzyme due to the differences in hydrogen bonds formed. As a result...
Answered by • Biology tutor
3027 Views

How should I tackle an essay question based on an extract to achieve top marks?

When considering extracts from literature, it is essential to focus on the overall concept that the author wants to convey. This may be identified as the main theme of the text which will guide our interpret...
LL
Answered by Ludovico L. • Italian tutor
1731 Views

Single electrons travelling at 550 ms^-1 are passed through a diffraction grating with a spacing between the slits of 2.5 micrometers. What would the angle between the zeroth and first maximum of the resulting interference pattern be?

This is a question based loosely around the specification of the OCR A-Level Physics B course, requiring the student to recall two important quantum mechanical relations, first with one from the A2 part of t...
TH
Answered by Tom H. • Physics tutor
2104 Views