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Describe the stages in viral replication

The first stage in viral replication occurs when a virus attaches to the surface of a host cell. The viral nucleic acid (VNA) then enters the cell. The VNA then takes over the cell, altering the metabolis...

Answered by Tara F. • Biology tutor

14448 Views

I often understand the question and think I have answered it correctly, but I don't get all the marks for my answer. What am I doing wrong?

One of the things that you need to remember about Biology A Level is that you have to memorise the key points of the mark scheme. Something that I consistently struggled with when I was doing past papers ...

Answered by Shannon M. • Biology tutor

6212 Views

Describe the pathway of electrical activity in the heart during contraction.

The sino-atrial node (SAN) is located within the wall of the right atrium, and acts like a pacemaker (it instigates the rhythms of the heart). The SAN sends out regular waves of electrical activity along ...

Answered by Jack R. • Biology tutor

6208 Views

what is the structure of a plant cell?

cell wall- this is strong, due to the cellulose nucleus- what is the person of a nucleus- contains genetic information vacuole- sap filled membrane that gains water and loses water, giving the plant cell ...

Answered by Nikita V. • Biology tutor

2644 Views

what is the structure of a skeletal muscle?

Muscle cells- are multinucleated, striated, and cylindrical in shape. What is the smallest contractile unit of a skeletal muscle called? It is a sarcomere what does the sarcomere consist of? It contains t...

Answered by Nikita V. • Biology tutor

3520 Views