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Biology
A Level

How is exocytosis different from active transport?

This is a common and understandable mistake that is made since essentially both of these processes refer to molecules being moved out of the cytoplasm of a cell using energy. There is however a major diff...

MV
Answered by Meghna V. Biology tutor
14084 Views

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 ...

PV
Answered by Pankti V. Biology tutor
10997 Views

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 bon...

AT
Answered by Abishan T. Biology tutor
2063 Views

compare and contrast transcription and translation

compareboth involve nucleotide basesboth involve RNAcontrasttranscription copies DNAtranscription produces mRNAtranslation produces a polypeptidetranslation uses tRNA molecules

CE
Answered by Cameron E. Biology tutor
2159 Views

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 th...

AH
Answered by Ayesha H. Biology tutor
10792 Views

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