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How can antibacterial resistance be limited?

Questions: What is resistance? How does resistance occur?Answer:Don't overuse antibiotics. Don't prescribe antibiotics for a viral infectionPatients must finish a full course of antibioticsRestricted use ...

Answered by Beth M. • Biology tutor

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How to cells divide?

Cells divide using mitosis. The stages of mitosis are: interphase, prophase, metaphase, anaphase and telophase. In interphase the DNA is loose in the nucleus and is copied to result in 2 identical copies ...

Answered by Connie E. • Biology tutor

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Compare aerobic and anaerobic respiration in a human cell. 3 marks

3 marks, meaning 3 separate points and a minimum of 3 answers for full marks. 1 comparison mentioning each of the points is 1 mark. Use comparators e.g. less and more. Better to be safe than sorry!Compare...

Answered by Niamh M. • Biology tutor

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Explain how a reflex action occurs

Reflex actions are automatic responses to stimuli i.e. a change in an environment.A receptor first detects a stimulus such as heat, its function is to convert this stimuli energy in this case heat into an...

Answered by Arjun V. • Biology tutor

2702 Views

Meselson & Stahl grew E. coli cells in a dense N15 nitrogen medium, then transferred to a lighter N14 nitrogen medium. Describe the observations of their experiment (until the third generation) and use it to explain the mechanism of DNA replication.

Observations:- After each generation, the amount of DNA will be doubled during the S phase of interphase- At the start, all DNA will be labelled N¹⁵- In...

Answered by • Biology tutor

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