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Questions in Nucleic Acid Structure and General Features
Page 1 out of 3 Pages
- In the video we watched in discussion, it says that only .5% of the DNA that we have codes for Genes. Other 99.5% DNA is in a sense a junk DNA. And it's also true that we have just twice as many genes as the fruitflies. so, does this mean that fruitflies have all the DNA but it isn't coding for the genes that humans have? And is this concept of Junk DNA universally true in every living thing?
And it's also hard for me to grab the concept that the most of our DNA is kind of junk. So, is it really true that it's junk or whatever it's function is, is so small or negligible that we just ignore it and call it a junk. If so, what is that function?(32899 views)
- I understand how the phosphate groups in the middle have only one phosphate in them and the 5 prime end has 3 phosphates. However, I was wondering what happens with an entire string of nucleotides in that does the nucleotide at the 3 prime end also have a triphosphate group because it is at the end of the chain or does it only have one? If it has 3, how do you differentiate between the 5 prime and 3 prime end? I hope that makes sense.(17245 views)
- When forming a phosphodiester linkage, two phosphates are broken off. What happens to those two phosphate groups? Do they provide an extra boost of energy? Also, you coined "pyrophosphate group" in lecture, I was hoping you could clarify what that is referring to.(17789 views)
- If a base + sugar is a nucleoside, and a base + sugar + phosphate is a nucleotide, why is a nucleoside + 1 phosphate called a nucleoside monophosphate? Doesn't it become a nucleotide when a phosphate is added to the base and sugar?(20599 views)
- Is the synthesis of nucleic acid an endergonic or an exergonic reaction? I wasn't sure if it were endergonic because of the energy required to make the phosphodiester linkage or if it were exergonic because of the two phosphate groups that are released.(49743 views)
- What is the difference in structure between an RNA with an adenine base and the structure of ATP. If either one of these is drawn on the test how can you tell which molecule it is.(36069 views)
- In terms of the nucleotide bases and the two types (pyrimidine and purine) how can you tell by looking at them which one is which? I thought I understood by looking at the notes the difference in their appearance but I was confused by a reference to a purine later on in lecture 9. I feel like there is something simple that distinguishes them but I'm not sure what it is.(20445 views)
- I am not sure about definitions among DNA, gene, chromosome, and genome. I think the genome is made of lot of DNA, and DNA is made of genes. However, I have no idea about a chromosome. What is it?(32655 views)
- Apart from dNTP, are there dUTP,dCTP,dTTP,dATP and dGTP? Why? Similarly, apart from NTP, are there TTP,CTP, UTP, ATP and GTP. Why?(22410 views)
- Are phosphodiester linkages covalent bonds? (23828 views)