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How can a DNA mutation be neutral?
The effects of a mutation can be limited at several stages of gene expression. 1) Transcription: If the mutation is in a non-coding region, this is not transcribed into mRNA and so there is no change to the ...
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Vi R.
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Biology tutor
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What is the structure of DNA?
DNA stands for deoxyribonucleic acid. And what is DNA? Well, it’s basically a carrier of genetic information. DNA is found in all cells, and it contains the information needed for cells to live, to grow and ...
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Molly S.
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Biology tutor
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Give 2 features of DNA and explain how each one is important is semi-conservative replication?
Semi-conservative replication would produce 2 copies that each contained one of the original strands and one new strand. 1- Weak hydrogen bonds between bases allow two strands to unzip2- 2 strands exists, bo...
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Fady K.
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Biology tutor
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Explain how antibiotic resistance can be developed by bacterial populations.
Within the initial population of bacteria, some will have an allele that provides them with resistance to a specific antibiotic which is due to mutations, random spontaneous changes in the base sequence of D...
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Biology tutor
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How does a heart beat happen?
Unlike other muscle cells in the human body, cardiac muscle is able to contract independently of the central nervous system. This is because it contains ‘pacemaker cells’ which are able to spontaneously gene...
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David O.
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Biology tutor
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