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What are some of the non-specific, first-line immune defences in humans?

When we think of immune defences, our minds may immediately jump to white blood cells such as macrophages or T lymphocytes, however there are actually many mechanisms by which our bodies fight infection b...

Answered by Dawid A. Biology tutor
2330 Views

Describe the process of DNA replication.

The method in which DNA replicates is called semi-conservative replication. Firstly, DNA helicase catalyses the break down of the hydrogen bonds between the base pairs in the DNA molecule. This partially ...

Answered by Lily G. Biology tutor
2560 Views

Discuss the accuracy of the terms "one gene, one protein"; "one gene, one enzyme"; and "one gene, one polypeptide."

The phrase "one gene, one protein" is inaccurate, as shown by the example of haemoglobin: this protein contains prosthetic haem groups which are not made by the activity of any gene, therefore g...

Answered by Angus B. Biology tutor
14265 Views

Describe the steps in Eukaryotic cell division

Cell division is split into interphase which encompasses G1, S and G2 phase after which is mitosis which is also split into Prophase, Metaphase, Telophase and Anaphase (PMAT - Pilots Make Arrivals Timely)...

Answered by Krupa T. Biology tutor
2396 Views

What is active transport?

Active transport is the transport of substances against their concentration gradient with the use of energy. Molecules naturally flow down their concentration gradient, ie. from where they are more concen...

Answered by Chris D. Biology tutor
2494 Views

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