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What is a world city?

A city that has very significant economic or financial and/or political influence on an international scale. Features: Major centre for finance, trade, businessMajor centre for culture, media Major centre fo...
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Answered by Rose J. • Geography tutor
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Outline the importance of photosynthetic pigments in photosynthesis

Photosynthetic pigments are found in certain proteins and absorb photons (waves of light) at particular wavelengths. This absorbance causes electrons in the pigments to become excited and they increase in en...
Answered by • Biology tutor
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Explain why glucose is needed for the contraction of skeletal muscle.

Skeletal muscle use glucose in glycolysis to generate ATP, the energy currency of the cell. ATP binds the myosin head in skeletal muscle to displace actin (a protein bound as part of the muscle contraction c...
Answered by • Biology tutor
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How do I know when to use the subjunctive or indicative with the word 'cuando'?

'Cuando' belongs to the group of 'conectores temporales', or, words that help us to express actions in different points of time. 1. If you want to describe an action that is habitual or set in the past you u...
Answered by • Spanish tutor
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Draw an example using a diagram of Carbon, three "Y" substrates and an "L" indicating any leaving group the Sn1 nucleophilic substitution reaction. (3 marks) Which step is fastest (1 mark).

Y 3 CL -> [Y 3 C] + + L - (1 mark)Ligand leaves in first step. Can still show ligand as product anion but no need. Also accept any halide as leaving group. Step 2 a little harder as not signposted in ques...
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Answered by James P. • Chemistry tutor
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