17689 questions

'inter eos erat puella tam pulchra ut oculos omnium ad se verteret'. 1) Translate this sentence. 2) Identify the construction; what are the hints? 3) Explain the tense and mood of 'verteret'.

1) Among them was a girl so beautiful that she turned everyone's eyes towards her.2) Result Clause. 'tam' (so) is the biggest clue. 'ut + subjunctive' also means that the construction could either be a result or purpose clause.3) 'veteret' is in the subjunctive mood because it is within a result clause introduced by 'ut'. In a result clause, the tense of the subjunctive verb is dependent on the sequence of tenses: if the introductory verb is historic (perfect, imperfect, pluperfect) as it is here (erat - imperfect), then the verb in the result clause is imperfect (as veteret is here). If it were primary, the verb would be present subjunctive.
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Andrew W.

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Find values of x in the interval 0<x<360 degrees. For which 5sin^2(x) + 5 sin(x) +4 cos^2(x)=0

This question is split up into two parts.
Firstly recall the trigonometric identities you know, the trick here is to eliminate one of the squared terms. Using 4sin^2(x) +4cos^2(x) = 4, the cos term is eliminated.
Rearranging this equation leaves you with a strange quadratic equation, but if you pretend sin is x it actually looks quite simple and can be solved like a simple quadratic. Solve like this and replace x for sin and the solution follows
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James G.

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Effect of non-competitive inhibitor (on enzyme activity) on enzyme catalysed reaction

Binds on to enzyme at a site that is not the active sitechanges the tertiary structure of the active sitesubstrate cannot bindinhibits enzyme activity
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Kelvin C.

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Effect of competitive inhibitor (on enzyme activity) on enzyme catalysed reaction

similar in shape to {substrate}fits onto active siteprevents substrate bindinginhibits enzyme activity
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Kelvin C.

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Effect of enzyme concentration in excess substrate on enzyme catalysed reaction

directly proportional: increase in [enzyme] will increase rate of reaction
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Kelvin C.

Answered by Kelvin, Biology tutor with MyTutor

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Effect of substrate concentration on enzyme catalysed reaction

Rate of reaction increases proportional to increase in [substrate]Rate of reaction then levels off/ plateaus not all active sites are being used; adding substrate increases RoR all active sites used/ [enzyme] becomes limiting
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Kelvin C.

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Effect of pH on enzyme catalysed reaction

At optimum pH, active site is complimentary to substratepH changes disrupt H-bonds/ ionic bonds
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Kelvin C.

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Effect of temperature on enzyme catalysed reaction

1. Increasing temperature increases KE of molecules1. so more enzyme-substrate (E-S) collisions1. more E-S complexes formed2. Hydrogen/ ionic bonds broken2. Enzyme becomes denatured2. Active site changes shape, no longer complimentary to substrate
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Kelvin C.

Answered by Kelvin, Biology tutor with MyTutor

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