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Because RNA is composed of four parts of nucleotides, there are 43 = 64 possible codons, which is 64 possible triplets of nucleotides with several sequences. Furthermore, only 20 amino acids are commonly found in proteins so which, in most cases, a one amino acid is coded for through various dissimilar codons described in the figure. The genetic code is thus said to be degenerate. In reality, only methionine and tryptophan are shown by a single codon. As a conclusion of the genetic code's degeneracy, a mutation which changes only a single nucleotide in
Figure: The genetic code.
DNA point mutation, and thus changes only a single nucleotide in the corresponding mRNA, frequently has no effect on the amino acid sequence of the encoded polypeptide.
In shorthorn cattle, the coat colours red or white are controlled by a single pair of alleles. A calf which receives the allele for red coat from its mother and the allele for whit
Genetics of Nitrogen-fixation The genetics of nitrogen-fixation is known in detail in Klebsiella pneumoniae. There are twenty genes required in organising the complete N 2 -fi
A leaf is detached from a tree and tested with iodine. The leaf turns dark blue. (a) What does this result tell you? (b) Why is this result not sufficient e
Q. How does the pancreatic juice resume the digestion of carbohydrates? What is the involved enzyme? Carbohydrate digestion begins with the action of the salivary amylase (ptya
Nucleotides Compounds consisting of a nitrogenous base, a pentose sugar and a phosphate group.
The psychological effects of total edentulism are complex and varied, and range from very minimal to a state of neuroticism. Although complete dentures are able to satisfy the esth
HOMEOS T ASI S - Homeo = same, Stasis = state Living beings maintain their internal environment by self regulating system, it is called homeostasis. Term coined by
Q. Primary prevention of diabetes mellitus? Approaches to Prevention: There are various approaches to prevention. Four levels of prevention related to different stages of a di
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Researchers (Helle et al., 2004) analyzed rates of twin births in the Sami population of Northern Scandinavia during the eighteenth and nineteenth centuries. They found that (1) a
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