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Biology
A Level

Explain how restriction endonucleases are used to form recombinant DNA plasmids.

Endonucleases cut DNA at palindromic sites producing 'sticky ends'. The endonuclease cuts the plasmid DNA and the DNA to be inserted at the same palindromic site. The sticky ends of the plasmid DNA and th...

Answered by Tutor392986 D. Biology tutor
2592 Views

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...

Answered by Simran J. Biology tutor
24852 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
2264 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...

Answered by Mohammad H. Biology tutor
2102 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...

Answered by Ciara L. Biology tutor
5848 Views

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