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What is semi-conservative replication of DNA? And why is it important?

Semi-conservative DNA replication involves splitting open the parent cells DNA duplex and exposing both strands. Now these strands are accessible to replication machinery to act as a template, so that the se...
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Answered by Katie P. • Biology tutor
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Describe the similarities between photosynthesis and respiration.

Both photosynthesis and respiration involve the conversion of energy from one form to another through a series of biochemical reactions. Both processes use and produce ATP in reactions that are carried out o...
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Answered by Jessica P. • Biology tutor
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Describe and explain the main function of the proximal convoluted tubule in filtration/absorption.

The proximal convoluted tubule is used for selective re-absorption of glucose, water, peptides and other nutrients from the tubule fluid back into the blood. The cells lining this tubule are ciliated, to ens...
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Answered by Holly R. • Biology tutor
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What are two protein filaments that interact in the sarcomere to cause muscular contraction?

Actin and myosin filaments. Myosin heads bind to actin filaments, and the hydrolysis of ATP causes them to change shape and pull the actin filaments along horizontally.
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Answered by Louis W. • Biology tutor
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Define the term "stem cell".

A stem cell is an undifferentiated cell, that has the potential to become a specialised cell.
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Answered by Tanisha P. • Biology tutor
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