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α- amylase activity by GA3 - Dormancy
Of the enzymes required for the digestion of starch α-amylase appears immediately after the start of germination. It was found that if the embryo was removed no a-amylase appeared, however, if very low concentations of GA3 were added to the seed the production of digestive enzyme proceeds. The work over the last 30 years proved the fact that GA3 initiates action at transcriptional and translational levels. Not only activation of pre-existing m-RNAs coding for a-amylase but synthesis of m-RNA also takes place after the exposure of seeds to GA3.
Cytokinins and Cell Division
Cell division involves synthesis of new DNA, RNA and a host of cell proteins in interphase (cell cycle S1 and S2). All these events are promoted by cytokinins. Cell division also means synthesis of a number of enzymes that are needed for the synthesis of cell wall and middle lamella.
Calorific value is one of the most important characteristics of a fuel. It judges the efficiency of fuel. Calorific value is defined as "the total quantity of heat liberated, wh
Oligosaccharides are short chains of monosaccharides linked together by glycosidic bonds. In case of oligosaccharides linked to proteins (glycoproteins) or lipids (glycolipids) o
Environmental impact assessment consists of 4 phases which are as follows: (i) Organizing the job. (ii) Performing the assessment. (iii) Writing the environmental impac
Discuss about electric field The electric field is a vector quantity whose magnitude is the force per unit charge and points in the direction of the force on the positive test
What are the chemical substances formed by water photolysis? What is the destination of each of those substances? Free electrons, hydrogen ions and molecular oxygen are liberat
Q. What is the association between sunrays and vitamin D? Vitamin D or calciferol is synthesized in the skin by the action of the ultraviolet range of sunrays upon precursor mo
Toxic agents present in food which interfere with thyroxine synthesis lead to the development of: 1. toxic goitre 2. cretinism 3. simple goitre 4. thyrotoxicosis si
Any significant variation in the internal temperature could have damaging effects on the body's enzymes. Homeotherms or warm-blooded animals including human can however generate co
Fusion of Egg and Sperm Pro-Nuclei The fusion of the sperm and egg which is the beginning of the fertilization process is completed with the fusion of the male and female pro
Q. What is the ecological role of earthworms? Earthworms have an important ecological role as they eat decomposing organic material. They also dig tunnels in the subsoil allowi
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