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Biology
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How do electrical impulses control the regular beating of the heart?

The electrical beating of the heart is controlled by the cardiovascular control centre located within the medulla oblongata within the brain. Heart rate is controlled by the frequency of impulses being se...

WG
Answered by William G. Biology tutor
2604 Views

Explain the four levels of protein structure, indicating the significance of each level

There are four levels to a protein's structure:Firstly, the primary structure which is the sequence of amino acids linked by peptide bonds. This level determines the type/function of the protein by influe...

SS
Answered by Shivani S. Biology tutor
4192 Views

Describe the similarities and differences between the processes of diffusion and osmosis. [4]

Both diffusion and osmosis are processes concerning the movement of molecules from an area of high concentration to an area of low concentration, along a concentration gradient. Any type of molecule can m...

RN
Answered by Ruth N. Biology tutor
2762 Views

DNA mismatch repair enzymes repair mainly bases on the newly synthesised DNA strand, using the old DNA strand as a template. If the mismatches were simply repaired without regard for which strand served as template, would this reduce replication errors ?

if the old strand were repaired using the new strand that contains replication error as the template. Then the error would become a permanent mutation in the genome. The old information would be erased in...

DS
Answered by Dorota S. Biology tutor
3490 Views

Which body organ has both an exocrine and endocrine function?

Exocrine glands release their product to the external environment, while endocrine glands release their product directly into bodily fluids. The pancreas does both: it releases digestive enzymes into the ...

OS
Answered by Oana S. Biology tutor
2630 Views

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