Where do you find Holliday junction? What is epigenetic inheritance? Give some e
ID: 78303 • Letter: W
Question
Where do you find Holliday junction? What is epigenetic inheritance? Give some examples. A thymine in a AT base pair got replaced by cytosine. What kind of mutation you will get after one round of DNA replication, if the DNA mismatch excision repair is done: a) on the old template strand b) on the newly synthesized strand? What are the contributions of:- Griffith Watson and Crick Avery, MacLeod and McCarty Hershey and Chase Meselson and Stahl Nirenberg and Leder and Matthaei and Khorana A nucleus has a diameter of 20 mu m. It has 5m of DNA packed inside it. What is the compaction of the DNA molecule in the nucleus? How many ways you can create a poly nucleotide chain 10 nucleotides in length? What are the different ways one can repair double stranded breaks in chromosomes? Which way is a perfect one to repair double stranded breaks? In which phase of cell cycle does this type of repair occur? How is it different from crossing over? In which phase of cell cycle does crossing over occur? What are the different features of a tRNA make sure you know the conserved sequences at 5' end and 3' end of a tRNA and the all the arms of tRNA where exactly the amino acid is carried in the tRNA, which end is phosphorylated etc)Explanation / Answer
101.
Given information,
T is replaced by A and not repaired by the repair pathway.
So, the parent molecule is AC.
After one round of replication, it produces two daughter molecules (AT and GC)
AT is replaced by GC. It is transition.
102.
Griffith: bacteria are capable of transferring genetic information through a process known as transformation
Watson and Crick: double helical DNA structure
Avery, Macleod and Mc Carty: DNA is the substance that causes bacterial transformation
Hershey and Chase: Confirmed that DNA is the genetic material.
Meselson and stahl: Semi conservative DNA replication
Nirenberg, Leder, Matthaei and Khorana: Genetic code
103.
Compaction factor = 5/(20 X 10^-6)
= 4 X 10^6 times
104.
Number of different combinations for a polynucleotide chain of 10 nucleotides = 4^10
105.
Homologous recombination and Nonhomologus end joining are the mechanism of DNA repair for dsDNA breaks.
Double strand break repair by NHEJ is the perfect one to repair dsDNA breaks.
It occurs shortly after DNA replication (S and G2 phases)
Crossing over is mixing of genetic material that occurs in the pachytene phase of meiosis I.
106.
tRNA shows a clover leaf structure.
It contains an amino acid acceptor arm that carries amino acids.
D arm recognizes specific enzymes.
TC arm is the ribosome binding site.
Anti codon arm pairs with mRNA.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.