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Pyruvate kinase catalyzes the third irreversible move in glycolysis. It is activated by fructose 1, 6-bisphosphate. The ATP and amino acid alanine allosterically inhibit the enzyme so which glycolysis slows when supplies of biosynthetic precursors and ATP (indicated by the levels of Ala) are already sufficiently high. Additionally, in a control similar to that for PFK, when the blood glucose concentration is low, glucagon is stimulates and released phosphorylation of the enzyme by a cAMP cascade. This covalent modification inhibits the enzyme so in which glycolysis slows down in times of low blood glucose levels.
Locomotion in Echinodermata Locomotion in echinoderms is accomplished through a unique canalicular system which is termed as the water-vascular system. This system is charact
What is inharmonious ecological interaction? Inharmonious, or negative, ecological interaction is that in which at least one of the participating beings is harmed.
Start with a cell with chromosome number 2n=6, and having two acrocentric pairs and one metacentric pair of chromosomes. Draw the cell in metaphase I. Indicate one pair of sister c
Explain the Criteria for Assessment of Vitamin Status? Vitamin E is assessed by determining the plasma lipid fraction levels. 0.8 mg of total tocopherol/g total plasma lipids i
Epidemiological studies The use of available data from the positive epidemiological studies in the risk assessment is encouraged. Data derived fiom human clinical studies, s
Explain briefly about the selenium Toxicity? There is a narrow margin between the beneficial and harmful intakes of selenium. The level at which selenosis occurs is not well-de
Define Mineral Absorption? NDOs affect mainly calcium/magnesium absorption and balance. Acidification of colonic contents increases the concentration of ionized minerals, parti
Q. How are the male gametes of gymnosperms formed? What is the relationship between the pollen grains and the concept of alternation of generations? In the male strobiles (cone
Unsaturated fatty acids show different types of isomerisms. We have already learnt about the.concept of isomerism in the last unit. You would realize that fatty acids with s
Types of Ovarian Cycles in Mammals Mammals exhibit two types of ovarian cycles; Estrous Cycle, exhibited by non-primates such as rats, cats, dogs, pigs, and Menstr
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