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6

The situation you ask about was originally part of the 27 ribbon and 2.27 helix structures considered as possibilities by protein chemists (Linus Pauling?) in the 50s or 60s. The diagram below, showing the ribbon, is from the classic text (long out of print) The Structure and Action of Proteins by Dickerson and Geis. This turns out to be very rare in ...


3

Parietal cells use ion pumps to expel protons and chlorine ions into the lumen, which create the necessary acidic environment to denature pepsinogen into pepsin. It is the low pH environment that reconfigures or denatures pepsinogen into pepsin. The acid used does not matter. For example, one experiment in classifying properties of pepsinogen used a 3.5 pH ...


3

Scrambled eggs can change color, but you perhaps haven't run into a batch that shows discoloration. It is the same chemical reaction: Why Scrambled Eggs Turn Green When serving a large group, a buffet can provide enough food for everyone without the need to spend all of your time in the kitchen. Breakfast is a fairly simple buffet to set up, but ...


1

The protein has 4 thousand amino acids. Will a single one change its function or shape? It very well might. High schoolers learn about the existance of sickle cell anemia, Tay-Sacks, cystic fibrosis, phenylketonuria...you must know about them too. If that is right, we should have an enormous number of alleles for the same gene (e.g. if we say less ...


0

Firstable, a point mutation in your DNA could change definitively the fate of your hypothetical coding RNA (later a protein product). The reason relies on the nature of the mutations: Missense mutation, Nonsense mutation or Frameshift mutation. In the nonsense one, definitely will make your protein non-functional because of the insertion of a STOP signal ...


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