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Cells becoming resistant to bacteria; Within a population of bacteria, NO cells are resistant to antibiotics. Over time, ALL cells are resistant to antibiotics. Outline the steps of natural selection that lead to a fully resistant population:

Within the bacterial population, the cells obtain different types of mutations. - One type of mutation is antibiotic resistance. - Some types of mutations are harmful to the cell, some have no or little effe...
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Answered by Emmaline S. • Biology tutor
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What are the properties of water?

This is part of the chemistry of life chapter. Its important to Biology because : Water is the medium of life and biology is the study of life. Water molecules are polar. this means the molecule is charged O...
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Answered by Shirleen B. • Biology tutor
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What are the arguments for the endosymbiotic theory?

There are several facts that could prove that mitochondria and plastids - eukaryotic organella descend from prokaryotic organisms. One of the arguments is that the metioned organella posses their own DNA to ...
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Answered by Dorota D. • Biology tutor
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Explain how ATP is produced through chemiosmosis during respiration.

First, it is important to note that a concentration gradient of H + ions is generated between the matrix of the mitochrondria and the inter-membrane space. This is because H + ion pumps pump H + ions from th...
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Answered by Pratyusha S. • Biology tutor
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Why was the experiment on DNA done by Meselson and Stahl strong evidence that DNA replication is semi-conservative?

Three theories for DNA replication at the time: Conservative replication: When DNA was replicated, entirely new molecules of DNA were made, meaning a newly replicated DNA molecule would be composed entirely ...
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Answered by Patricia B. • Biology tutor
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