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Biology
A Level

Describe the molecular structure of starch.

There are 2 types; amylose and amylopectin which are both made of alpha glucose and are tightly coiled. while amylopectin has branches and 2 bonds, 1-4 and 1-6 glycosidic bonds, amylose only has 1-4 glyco...

Answered by Biology tutor
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How is energy produced in the light dependent reaction of photosynthesis?

First things first, we need to be aware of where the light dependent reaction takes place in the plant cells. It happens in the chloroplasts and specifically in the thylakoid membranes of the chloroplasts...

Answered by Biology tutor
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Explain how a fish is adapted for gas exchange?

A fish had gills, made up of gill filaments containing lamellae, which provide a very large surface area for oxygen to diffuse out of the water as it moves over them. The blood vessels ar...

Answered by Biology tutor
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Explain how an activated oestrogen receptor affects the target cell?

The activated oestrogen receptor binds to the promoter region of the specific gene. It then stimulates RNA polymerase to transcribe the gene, thus increasing transcription.

AK
Answered by Adam K. Biology tutor
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What is the process of the heart pumping?

There are 4 chambers of the heart; 2 atria (upper chambers) and 2 ventricles (lower chambers). Blood flows from the vein into the atrium, and when the pressure of the atrium is higher than the pressure of...

Answered by Biology tutor
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