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What is the role of succession and how does this maintain ecosystems?

Succession is the term given to describe the changes that take place within an ecosystem. Barren land such as bare rock can be formed by the eruption of a volcano or a glacier retreating. The first stage of ...
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Answered by Pankti V. • Biology tutor
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The genetic code is the sequence of bases in DNA, which is found in chromosomes and is made up of double stranded polynucleotides. Explain what is meant by the term “double-stranded polynucleotide” in relation to DNA.

It is known as double-stranded as there are two strands of DNA joined by hydrogen bonds between the bases and polynucleotide refers to the fact that there are many nucleotides joined by phosphodiester bonds.
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Answered by Abishan T. • Biology tutor
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compare and contrast transcription and translation

compareboth involve nucleotide basesboth involve RNAcontrasttranscription copies DNAtranscription produces mRNAtranslation produces a polypeptidetranslation uses tRNA molecules
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Answered by Cameron E. • Biology tutor
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Describe and explain the role of positive feedback in an action potential

Describe:· Random or small amount of sodium ions enter the axon (diffusion) which leads to a slight depolarisation of the membrane· Down the concentration gradient (more sodium outside the cell than inside)·...
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Answered by Ayesha H. • Biology tutor
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What's your best piece of advice for an Oxbridge interview?

Personally, going into the interview process, one of my biggest fears was not knowing the answer to a question and lapsing into silence. The best piece of advice I received before going into interviews was t...
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Answered by Sarah B. • Biology tutor
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