Search our library of Biology questions

Top answers

Biology

All levels

What are the main structures of an animal cell, and what are their functions?

The main structures in an animal cell are: The cell membrane- the membrane found around the outside of the cell, some substances can cross it to move in and out of the cell (this means it is semi-permeabl...

Answered by Clare W. • Biology tutor

3108 Views

Describe how a wave of excitation, which originates in the sinoatrial node (SAN) of the heart, eventually results in ventricular systole.

• SAN send a wave of depolarisation/excitation across the atria causing them to contract• wave cannot pass directly to the ventricle, due to the non-conductive tissue of AV-valves• wave reaches the AVN (i...

Answered by Joseph G. • Biology tutor

5822 Views

Some plant cells contain the polymer starch. Explain how the structure and properties of starch are related to its function as a storage molecule.

Starch is a polymer of the sugar glucose, an important component of respiration and needed to provide plants with energy. Unlike glucose, starch is insoluble allowing it to be stored within the cell witho...

Answered by Daire C. • Biology tutor

9570 Views

What cells and in what order take part in the imune response?

https://www.bitpaper.io/go/Tara%20Cell%20recognition/H1OQMML-N

Answered by Thomas Georgas G. • Biology tutor

1818 Views

Explain the flow of blood through the heart and label the diagram (of the heart and its chambers)

The heart has 4 main chambers; the right and left atrium, and the right and left ventricle. Each receive blood and pump blood from and to different parts of the body. The right atrium receive de-oxygenate...

Answered by Tasnima B. • Biology tutor

6769 Views