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How do I differentiate the use of "el imperfecto" from "el pretérito" when describing actions in the past?

This is a tricky grammatical question that is asked a lot by students, but there are several differences between the two. Perhaps the most important difference is that el pretérito is used to refer to single...
Answered by • Spanish tutor
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How is DNA linked to protein synthesis? Why does mutations in DNA have serious implications on protein synthesis?

DNA is the genetic code of an individual, this has been assembled from the contributions of your maternal and paternal gamete genomes. When a gene is being expressed, a polymerase transcribes a copy in the f...
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Answered by Samuel W. • Biology tutor
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What is the job of the cell membrane?

Controls the movement of substances into and out of the cell.
Answered by • Biology tutor
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Briefly outline and evaluate authoritarian personality as an explanation of obedience to authority.

A personality type consisting of traits whereby individuals are obedient to those of a higher status. These individuals have conventional views and have strict adherence to social values. This personality is...
Answered by • Psychology tutor
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How can genetic engineering be used in forensic science and paternity tests?

Genetic fingerprinting is a technique that utilises the presence of highly repetitive non-coding DNA sequences in the human genome, known as variable number tandem repeats (VNTRs). These vary considerably be...
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Answered by Samuel W. • Biology tutor
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