Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Gene or point mutations occur when the DNA sequence of a gene is altered and the new nucleotide sequence is passed on to the offspring. This occurs either due to addition or deletion or substitution of one or a few nucleoticles. Nucleotide substitutions can be either transitions or transversions. Transitions are replacements of a purine by another purine (A by G or vice versa) or a pyrimidiile by another pyrimidine (C by T or vice versa). Transversions are replacements of a purine by the pyrimidine or vice versa (G or A by C or T or vice versa). We will briefly explain the different types of gene mutations.
a) Substitutions : substitution of one base by another would result in an altered amino acid in a polypeptide chain. For instance triplet AAT in DNA (UUA in mRNA) would specify leucine. But if the first A is ieplaced by C, it will code for valine. Some of the codons are degenerate and substitutions may not alter the amino acid specified. For instance, in the triplet AAT if the first A is replaced by G the amino acid coded would still be leucine. Gene mutations which do not normally affect the active site of a protein will not alter its biological functions. But nucleotide substitutions that change a triplet coding lor an amino acid into a termination codon would produce adverse effects. Once again in AAT, if the second A is replaced hy T (An), the resulting rnRNA codon IJAA is a termination codon. When a termination codon is present in the middle of an mRNA molecule the subsequent codons are not translated and an incomplete polypeptide will be released from ribosomes.
What are the Pupillary defects There are certain deviations from normal pupillary reflexes which point towards certain specific pathology.
DESCRIBE ELECTRON TRANSPORT SYSTEM AND PHOTORESPIRATION
Q. Investigations process of acute pericarditis? 1) Blood Examination Erythrocyte sedementaion rate (ESR) may be elevated in tuberculous; collagen and purulent pericarditis.
levels of biodiversity
Q What are the major morphological features of arthropods? Arthropods present three distinguishing features: they are metameric beings (segmented body), they present articulate
Which of the following is NOT required to determine equilibrium potential of a particular ion? Select one: size of the ion valence of the ion concentration gradient for
Cloning vector: The DNA molecule originating from the virus, a plasmid, or the cell of a higher organism into which an another DNA fragment of appropriate size can be integrated w
PETHIDIN E - Meperidine hydrochloride. Widely used as narcotic analgesic. It has local anesthetic action. METHADON E - It is an orally effective anal
Q. What is limnetic zone? The open water zone is called the limnetic zone. This represents the zone or depth of the water upto which sunlight can penetrate. Phytoplankton along
An enzyme isolated from a mutant bacterium grown at 20 degrees celsius works in a test tube at 20 degrees celsius but not at 37 degrees celsius( 37 degrees celsius is the temperatu
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd