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Biology
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describe the structure of prokaryotic cell (4 marks)

they don't have a nucleus, the DNA is present in cytoplasm. prokaryotic cell has a cell membrane that controls movement of molecules in and out of the cell. prokaryotic cells also have cell walls that pro...

JL
Answered by Julia L. Biology tutor
2031 Views

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 ve...

SJ
Answered by Steffan J. Biology tutor
2421 Views

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...

MS
Answered by Molly S. Biology tutor
72325 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 envelop...

LC
Answered by Lucy C. Biology tutor
3013 Views

Explain the structure of the DNA double helix, including its subunits and the way in which they are bonded together

DNA is made up of subunits called nucleotides. Each nucleotide is comprised of one nitrogenous base (either adenine, cytosine, guanine, or thymine), one phosphate, and one deoxyribose sugar. The nucleotid...

BH
Answered by Bethan H. Biology tutor
8231 Views

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