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MRSA and C. difficile are resistant bacterial strains which cause life-threatening infections in hospitals. Explain how MRSA/ C. difficile could arise from non-resistant bacteria. [6 marks]

Natural SelectionCompetition for survival between bacterial colonies/ Selection pressure is survivalVariation between colonies linking to phenotype of resistanceSpontaneo...

IC
Answered by Ijaz C. Biology tutor
2386 Views

Show using mathematical induction that 8^n - 1 is divisible by 7 for n=1,2,3,...

First step: n=1 we have 81 -1=7 which is divisible by 7. Assumption step: 8k-1 is divisible by 7. Induction step: Using the previous step we have that 8k-1=7x. So 8k<...

MC
Answered by Mike C. Maths tutor
5120 Views

Differentiate the expression x^6+5x^4+3 with respect to x

Using the general rule d/dx(a*x^n) = a *n * x^(n-1) and the linearity of the derivative operator, we obtain:
6x^5+20x^3+0 = 6x^5+20x^3

Answered by Maths tutor
2762 Views

Explore the significance of aspects of dramatic tragedy in the following passage and in relation to the play as a whole.

Introduction Shakespeare creates dramatic tragedy in the passage through Lear’s fatal decision to ‘divide in three our kingdom’. The irony of Lear’s action is heavy and the passage...

SH
8069 Views

Calculate (7 + √3)(7 - √3)

(7 + √3)(7 - √3) = 72 + 7√3 - 7√3 - (√3)2 = 49 - 3 = 46Alternatively you can go straight to identifying that this is the difference between two squares, using the fact that (a + b)(a...

IB
Answered by Isabel B. Maths tutor
3892 Views

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