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What does heat do to an enzyme and why can enzymes not be 'killed'?

Enzymes are proteins that are polymers made up of amino acid building blocks. When enzymes are made by cells, they are made as a long chain of amino acids that after some time, can fold up to form a specific...
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Answered by Jacob R. • Biology tutor
13047 Views

Describe the sequence of events that occur during DNA replication.

DNA replication begins with the unzipping of the double stranded DNA by the enzyme DNA helicase, which breaks hydrogen bonds as it separates the strands. Another enzyme known as topoisomerase holds the two D...
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Answered by Sumrah N. • Biology tutor
24553 Views

Describe how action potentials are initiated and transmitted within a neurone, mentioning the appropriate ions and types of ion channels

A stimulus causes a small influx of sodium ions into the cell, leading the cell to become more depolarised or more positive. If this reaches the threshold potential, of about -55 mV, then it will initiate an...
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Answered by Roxanne M. • Biology tutor
3338 Views

Describe that lock and key hypothesis

Enzymes are biological catalysts, which means that they increase the rate of a specific reaction by lowing the required activation energy. The lock and key hypothesis explains how the substrate (key) fits in...
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Answered by William W. • Biology tutor
8249 Views

Can you please explain the lock and key model of enzyme action to me?

Okay, so let's get back to basics. What is an enzyme? An enzyme is a biological catalyst that speeds up chemical reactions. How does it do this? All enzymes have active sites, which is where certain molecule...
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Answered by Eva T. • Biology tutor
9231 Views