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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.
A DNA library is a collection of cloned DNA fragments in a cloning vector which can be fined for a DNA of interest. If the target is to isolate particular gene sequences.
Q. How different is the simple cuboidal epithelium from the columnar epithelium? Where can these epithelia are found in the human body? The simple cuboidal epithelium is made o
Excretion in Animals Excretion is concerned along with the removal of metabolic wastes that arise as a result of oxidation of energy rich compounds and metabolism of proteins
An ecosystem is a self sufficient interacting system in the biosphere. Eg. forest, desert, pond etc. almost, all the ecosystem have more or less similar fundamental plan for their
Q. What is primary structure of a protein? What is the significance of the primary structure? The primary protein structure is the linear sequence of amino acids that outline t
What are the main events of the third mitotic period? The third mitotic period is anaphase. In anaphase the following events happen: duplication and breaking of centromeres wi
Plasmid is the class of the circular, extrachromosomal, autonomously replicating, DNA elements found in number of bacteria. Contain origins of the replication to ensure their main
compare the lengths and paths of the uterine tubes (oviducts) of the cat and the human
Phototropic curvature is the result of uneven distribution of : 1. Gibberellin 2. Phytochrome 3. Cytokinins 4. Auxin Auxin
What is a centimorgan? Centimorgan, or recombination unit, by convention is a distance among two linked genes that corresponds to 1% of recombination frequency of these genes.
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