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11
votes
4answers
691 views

How did the first life form on Earth reproduce without DNA?

How did the earliest life forms exist without DNA? The most likely scenario I can think of for life happening from nothing is that, over billions of years, with trillions of water molecules and dust ...
0
votes
0answers
15 views

Avoid Blood lyse color remain in DNA extraction

I tryed several times to extract DNA from freezed blood sample whit Qiagene kit but it gave very small amount of product due to good purity then I try extract manually by using CTAB PVP method and ...
8
votes
1answer
105 views

Why would a venus fly traps mouth that's still “chewing” die?

A venus fly trap produces leaves that act like traps for insects. A trapped insect is digested over several days. The trap then opens again to catch another insect. These traps regularly die off. ...
2
votes
1answer
40 views

Question regarding an Escherichia coli reaction

With respect to this link http://www.biocyc.org/ECOLI/NEW-IMAGE?type=REACTION&object=RXN-14479 Here the enzyme is mentioned and the two reacting compounds. Now , my question is 1. When these ...
1
vote
1answer
7k views

How does inorganic phosphate inhibit alkaline phosphatase?

I want to know how is inorganic phosphate able to inhibit alkaline phosphatase.
12
votes
2answers
590 views

Why does cyanide inhibit CuZnSOD, but not MnSOD or FeSOD?

Different types of superoxide dismutase (SOD) contain different metal ions (Zn, Cu, Mn, Ni, or Fe), all of which allow them to catalyze one reaction, dismutation of superoxide anion, O2−. Cyanide can ...
4
votes
1answer
323 views

What is the molecular mechanism of cystine bond formation?

My bioinorganic and redox chemistry isn't up to par and I'm having a very difficult time understanding the chemical mechanism behind cystine bond formation. Most reactive environments are actually ...