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Could you describe the blood flow through the heart?

Blood flows through human bodies via a double circulatory system, the systematic system and the respiratory system, which are connected by the heart. Blood enters the right atrium of the heart from the vena ...
SJ
Answered by Steffan J. • Biology tutor
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Describe the structure of starch. How does this structure make starch well suited for energy storage?

Starch is a mix of 2 different polysaccharides:1) Amylose: a long chain of α-glucose monomers joined by 1,4-glycosidic bonds. The chain coils in a spiral shape, held together by hydrogen bonds. This shape ma...
MS
Answered by Molly S. • Biology tutor
85064 Views

Describe the life cycle of HIV

A HIV molecule enters the blood stream and invades cells of the immune system (CD4 cells). To do this, proteins on the surface of the virus bind to receptors on the host cell. This then allows the envelope o...
LC
Answered by Lucy C. • Biology tutor
4195 Views

Describe how the resting state of a neurone in the body is maintained:

Na+/K+ ATP Transporters are found within the plasma membrane of a neurone. At rest, the transporters use ATP to pump 2 K+ ions into the cell for every 3 Na+ ions that are pumped out of the cell. This means t...
KG
Answered by Konrad G. • Biology tutor
3279 Views

Can you explain the different types of protein structure? (primary, secondary, tertiary and quaternary)

The primary structure of a protein is the sequence of amino acids found in the polypeptide chains, this sequence determines the shape and properties of the protein.The secondary structure of a protein is the...
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Answered by Flora B. • Biology tutor
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