Top answers

What is the structure and role of a chloroplast?

The chloroplast has a cell membrane like most cells/organelles. They are long and oval shaped with a similar shape/size to bacteria. Inside the organelle, the grana stack up like disks on top of one another....
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Answered by Adam W. • Biology tutor
5746 Views

What is the difference between viral antigenic drift and antigenic shift?

Both antigenic shift and drift are used by viruses to adapt to selection pressures and avoid host immune systems. Antigenic shift is a slow change in the viral genes over time due to replication errors and r...
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Answered by Sophie W. • Biology tutor
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How do white blood cells protect the body?

White blood cells in the body can attack pathogens, which are micro-organisms which cause disease. The white blood cells can ingest the pathogen, produce antibodies which destroy a particular pathogen, or pr...
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Answered by Eleanor M. • Biology tutor
12463 Views

How does Meiosis increase variation?

In the first stage of Meiosis 1 - Prophase 1, after the chromosomes have coiled and condensed they ay touch each other at points known as chiasmata, and Crossing Over occurs. This is where genetic informatio...
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Answered by Bobbie C. • Biology tutor
11618 Views

How is an electrical impulse transmitted through the heart?

Contraction of the heart is myogenic meaning it initiates from within the heart muscle itself (myo=muscle, genic= created). Therefore, no extra nerves need to signal the heart to contract which is important ...
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Answered by Rebecca Z. • Biology tutor
19580 Views