What Biochemical Changes Occur with pH Shifts and Nucleotide Composition?

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The discussion centers around the effects of pH changes on various types of molecular interactions, with participants debating which interactions are most likely to be disrupted. It is suggested that hydrogen bonding and ionic bonding are less affected by pH changes, while hydrophobic interactions may be more susceptible. The conversation shifts to the role of nucleotides, specifically those containing a purine, ribose, and phosphate group, which are identified as building blocks for mRNA, tRNA, and rRNA, but not DNA. Clarification is provided that while ribose is present in all RNA types, additional components are needed for tRNA and rRNA. The discussion also touches on DNA structure, confirming the complementary nature of strands, and the synthesis of starch from glucose, which is described as an anabolic process that decreases entropy within the system, raising questions about overall entropy changes in the universe. Dehydration synthesis is noted as a process that decreases entropy by forming larger molecules from smaller ones.
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which of the following will most likely be disrupted by a change in pH?

1) hydrogen bonding
2) ionic bonding
3) hydrophobic interactions
4) disulfide bonds
5) neither

-I'm pretty sure its not 1) and 2) since changing the pH won't affect the electronegativity of an atom...Pretty sure that its not disulfide bonds either, so from that I am guessing that its hydrophobic interactions..am i right? or is my concept wrong?

A nucleotide containing a purine, ribose, and a phosphate group could be a building block for?

a) dna
b) mRna
c) tRna
d) rRna
e) b,c,d

-Ok it is NOT A for sure, so I am assuming that a nucleotide contaning a purine, ribose, and phosphate group could be a building block for all b,c,d...am i right ? or am i missing an important concept?

A DNA molecule with 5'ATCGTAC3' = 3'TAGCATG5' right?

If one thousaidn glucose molecues arrive in a cell, and the 1000 glucose molecules join together into a starch molecue, what changes occurred with the synthesis of the starch molecule?

-well this is an anabolic pathway since we are building something small into something bigger. So entropy decreases, since this is a non-spontaneous system. However, does the entropy of the universe decrease, or the entropy of the cell decrease?

Dehydration syntehisis will decrease entropy within a system right? since its the formation of smaller molecules into bigger ones?
 
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nemzy said:
A nucleotide containing a purine, ribose, and a phosphate group could be a building block for?

a) dna
b) mRna
c) tRna
d) rRna
e) b,c,d

-Ok it is NOT A for sure, so I am assuming that a nucleotide contaning a purine, ribose, and phosphate group could be a building block for all b,c,d...am i right ? or am i missing an important concept?

You are right it is not A. Ribose is in all the type of RNA. rRNA requires some protein component. tRNA also require an amino acid to be complete. Although, C and D would be incomplete, they, however, only ask for building block, and E is the answer

nemzy said:
A DNA molecule with 5'ATCGTAC3' = 3'TAGCATG5' right?

It is right but you should put in 5' to 3'
5' GTACGAT 3'
 

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