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Biology
A Level

Describe the mass flow hypothesis of translocation.

Photosynthesis occurs in the leaf (source), making sugars: fructose and glucose. These are converted to sucrose and are actively transported into the phloem (sieve tube element) by companion cells. The in...

SJ
Answered by Simran J. Biology tutor
27886 Views

Describe the structure of proteins

Proteins are polymers of Aminoacids. Aminoacids are joined in condensation reactions (water is eliminated) by peptide bonds. The primary structure is the order of aminoacids in the protein, while the seco...

Answered by Biology tutor
2827 Views

Describe the process of DNA replication?

The DNA replication is a process in which double stranded DNA molecule is divided into two daughter copies during cell division (mitosis). The replication of DNA takes in stages by semi conservative metho...

MH
Answered by Mohammad H. Biology tutor
2858 Views

What did the Meselson and Stahl experiment show?

DNA replication was thought to be either conservative (two old strands of DNA stay together), semi-conservative (one old and one new strand of DNA), or dispersive (bit of old and newly replicated DNA in e...

CL
Answered by Ciara L. Biology tutor
7701 Views

describe how a genetic mutation of the gene coding for lactase can lead to lactose intolerance.

-A genetic mutation within the lactase gene, for example base substitution, changes a codon -This codon codes for a different amino acid to be transcribed and translated-Therefore the sequence of amino ac...

JM
Answered by Jessica M. Biology tutor
3503 Views

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