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Peptide bond formation is catalyzed by peptidyl transferase. The carboxyl end of the amino acid bound to the tRNA in this reaction and in the P site is uncoupled from the tRNA and becomes joined by a peptide bond to the amino set of the amino acid connect to the tRNA in the A site. A protein with peptidyl transferase activity has certainly not been isolated. The reason is now obvious; in E. coli at least, the peptidyl transfers activity is related with part of the 23S rRNA in the vast ribosomal subunit. Alternatively, peptidyl transferase is a ribozyme, a catalytic activity which resides in an RNA molecule.
The evolution of human kind can be regarded as the climax of phylogenic history of organisms. In the previous units of this block as well as the previous block we have detailed for
Q. What are the intermediate and the definitive hosts of the plasmodium? In the life-cycle of the plasmodium humans are the intermediate hosts (where asexual reproduction takes
Q. What is the relation between secretion of parathormone and the calcium blood level? The parathormone increases the calcium blood level since it stimulates the resorption (re
Oleic - Linoleic Fats Fats in this group are the most abundant. The oils are all of vegetable origin and contain large amounts of oleic and linoleic acids, and less than 20%
How does the placement of veins help to carry out their function of transporting materials to and from the leaf ?
Q. Show Very low level of lactase activity? Very low level of lactase activity: at very low level of lactase activity all milk products must be eliminated, substitutes of milk
Q. Do bacteria cells have a nucleus? In bacteria the genetic material is dispersed in the cytosol and there is no inner membrane that delimits a nucleus.
Define the Drug and Drug Effect? In the discussions above, we reviewed the effect of food on drug metabolism. Interestingly, not only can drugs interact with food and alcohol,
Why Pregnancy and lactation are critical stages in lifecycle? You must be aware that the situation of women is far from optimal and it is necessary to give attention to their n
Why Protein requirements of athletes get increased? Protein requirements of athletes, particularly those engaged in strength and power events, may be increased above those of s
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