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Hexokinase, that catalyzes the first irreversible step of glycolysis, is inhibited by glucose 6-phosphate. Thus when PFK is inhibited and fructose 6-phosphate builds up and so does glucose 6-phosphate due to these two metabolites are in equilibrium by phosphoglucoisomerase. Hexokinase inhibition then reinforces the inhibition at the PFK step. At first sight this seems commonly as it is usually the first irreversible step of a pathway (the committed step) that is the major control step. On this basis, it may appear in which hexokinase should be the main control enzyme not PFK. Furthermore, glucose 6-phosphate the product of the hexokinase reaction can also feed into glycogen synthesis or the pentose phosphate pathway. Thus the first irreversible step which is exclusive to glycolysis is which catalyzed by PFK and therefore this is the main control step.
Hydrophilic and some lipophilic hormones bind to cell surface receptors. These are necessary membrane proteins located in the plasma membrane which bind the signaling mol
Diplotene: The paired chromosomes repel each other and begin to separate. Separation however, is not completed, because homologous chromosomes remain united by their point
Krebs Cycle The acetyl group of acetyl co A is now completey degraded stepwise into carbon and hydrogen atoms in the mitochondria by a cyclic sequence of eight ma
Processing grains and oil seeds for animal feeding Simple processing of grains such as grinding facilitates the digestion particularly in cattle and buffaloes. Fine grinding of
Q. How can an organism that once underwent contact with an antigen be immunized against future infections by the same agent? This phenomenon is called as immune memory when an
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 deleti
To study whether bacteria grow best where it is moist or dry Use 2 sterile dishes. Inoculate each one by touching a sterile transmit needle to a bacteria colony rowing in anoth
Dry Stigma - Category of Stigma The Cotton (Gossypium hirsutum) stigma is covered with long unicellular hairs. At the time of pollination, the stigmatic hairs show a distinct
Reality Theory Developed in the 1960s by Willian glasser, a psychiatrist, reality therapists view human nature in terms of behaviour. They believe that human behaviour i
Q How does the presence of exoskeleton describe the general small size of arthropods? Since they have periodic ecdysis and exoskeleton, the growth of arthropods is limited to a
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