Biology Questions and Answers
In DNA nucleotides can be formed of
adenine (A), thyminor guanine (G). In RNA nucleotide (T), cytosine (C)es can (^)
also contain adenine (A), cytosine (C) or
guanine (G), however, instead thymine (T) there is uracil (U).of
- Which are the nucleotides
“portions” that bind in the
formation of nucleic acids?
What is meant by the 5’ and 3’
extremities of nucleic acids?
The phosphatbinds to the pentose oe group of one nucleotidf the other e
nucleotide and so on to make the
polynucleotide chain.
Each extrcan be distingemity of a DNA or RNAuished from the other chain
extremity according to their terminal
chemical entity. The phosphate-eextremity is called 5’-extremity anndedd the (^)
pentose-ended extremity is called
3’-extremity. So DNA or be run along the 5’-3’ way or along theRNA chains can
3’-5’ way. These ways are important in
several biologicalRNA since some reactions sp functions of DNA andecifically
occur following one way or the other
way.
- Bacteria are prokaryotic
cells, i.e., they do not have a
membrane-delimited nucleus.
Eukaryotes have cells with a
delimited nucleus. Where in
these types of cells can DNA
be found?
In eukaryotic cells DNA is found withinthe cell nDNA is found dispersed in the cytosol,ucleus. In prokaryotic cells (^)
the fluid space inside the cell.
Other DNA moleculwithin mitochondria anes can also bd chloroplasts,e found
specialized ocells. rganelles of eukaryotic
- Who were James Watson,
Francis Crick and Maurice
Wilkins?
Watson (British)(North Am and Wilkins (New erican), CrickZealand (^) er)
were the discoverestructure of DNA, the double helix madrs of the molecular (^) e
of two polynucleotide chains paired by
their nitrowon the Nobel prize in Medicine in 1962gen-containing bases. They (^)
for the discovery.
- According to the Watson-
Crick model how many
polynucleotide chains does a
DNA molecule have?
The DNA molecpolynucleotide chains boule is formed by twound in
antiparallelforming a helical structure. mode (5’-3’ to 3’-5’) and - What is the rule for the
pairing of nitrogen-containing
bases in the DNA molecule?
And in the RNA? Is this last
question appropriate?
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