Tutor profile: Claire W.
What is the electron configuration of the element whose atomic number is 26?
The electron configuration of iron (Fe) is: 1s2 2s2 2p6 3s2 3p6 4s2 3d6
What is an allosteric enzyme?
An allosteric enzyme requires binding of regulatory molecules to regulate its catalytic activity. Allosteric enzymes are usually associated with a conformational change that either turns the enzyme on or off when the regulatory molecule binds.
Why was DNA chosen as the molecule to store the genetic code?
DNA has several important features. First, it is very stable - more stable than RNA, for example. Upon damage, DNA repair mechanisms can fix any mistakes to prevent mutations from occurring. DNA can store extremely large amounts of genetic information and be condensed to fit in nuclei, while still being accessible to cellular machinery so that it can be transcribed/translated. DNA can also be replicated, which makes it transmittable to offspring. Finally, DNA is susceptible to low levels of mutation, which allows for evolution to occur through the generations.
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