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Biology
A Level

Briefly describe the bonding between Adenine and Thymine units (1)

The bonding between adenine and thymine consists of two hydrogen bonds between each unit(The way I like to remember this is that the Walker vehicles from Star Wars are known as 'AT AT's)

Answered by Leo D. Biology tutor
2044 Views

Explain why short bursts of anaerobic exercise is possible (in mammals), but impossible at longer durations? (4)

In the absence of oxygen, the anaerobic glycolysis pathway can occur, which produces roughly 1/15th of the normal yield of ATP from aerobic respiration, as well as two molecules of NADH (reduced NAD). Sim...

Answered by Leo D. Biology tutor
1724 Views

The actual size of a microrganism is 3.6 micrometres and the image size is 9 cm, what is the magnification of the diagram?

I = A X M M = I / A mm -> μm (x10000) 9 cm = 90000 μm90000 / 3.6 = x 25000 magnification

Answered by Sharon L. Biology tutor
1842 Views

How is starch digested?

Starch is a polysaccharide- a chain of maltose sugars bonded with glycosidic bonds. Digestion begins in the mouth by the mechanical breakdown of starch as the teeth increase the surface area for enzyme ac...

Answered by Biology tutor
18388 Views

Could you name and describe the different stages of the mitotic cell cycle?

The different stages of the mitotic cell cycle comprise prophase, metaphase, anaphase and telophase. Prophase: Condensation of the chromosomes and the mitotic spindle begins to form. The spindle is compos...

Answered by Jessica A. Biology tutor
2111 Views

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