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Zymogens, or proenzymes, are enzymes secreted in inactive form. Under certain conditions, a zymogen shifts to the active form of the enzyme. Zymogen secretions in general occur due to the enzyme activity can harm the secretory tissue.
For example, the pepsinogen secreted by the stomach becomes active under acid pH turning into the enzyme pepsin. Other well-known zymogens are trypsinogen and chymotrypsinogen. Enzymes are secreted by the exocrine pancreas and correspondingly trypsin and chymotrypsin.
Middle piece - Structure of the Sperm Just behind the head, the small constriction (neck) carries a distal and a proximal centriole. The two lie at right angle to each other.
Why must our cells duplicate the DNA molecules before they divide in Mitosis? Why do chromosomes condense by wrapping around the histone protiens durning the cell cycle?
Photoperiodism was first characterised in : 1. Tobacco 2. Potato 3. Tomato 4. Cotton Tobacco is the first in whic photoperiodism characterised.
Define Urinary Excretion Test - Thiamin Status? The urinary excretion of thiamin is an index of recent dietary intake of the vitamin. Hence, determination of thiamin in urine s
Define Serum Vitamin A Content? Assessment of serum vitamin A content is the most reliable criterion Tor assessing vitamin A status. Serum levels indicative of various degrees
Is the stage when an insect larva is within a cocoon a stage of total biological inactivity? The period when the larva is inside its cocoon is a time of intense biological acti
cellis basic unit of life
Q. What is the evolutionary importance of pteridophytes? As the first pteridophytes, tracheophytes were also the first plants to extensively colonize the terrestrial environmen
Q. Explain the types of basic forces? Compression: This refers to the squeezing of the test material so that it still remains as a single undivided unit but may occupy less v
When you eat a salad with lettuce, croutons, hard-boiled egg, bacon bits, and salad dressing, which one of those ingredients will be broken down the least by your digestive system?
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