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• Cyclins accumulate during the G1, S, and G2 phases of the cell cycle. • By the G2 checkpoint (the red bar in the figure), enough Cyclin is available to form MPF complexes (aggregations of Cdk and Cyclin) which initiate mitosis.
o MPF apparently functions by phosphorylating key proteins in the mitotic sequence.
• Later in mitosis, MPF switches itself off by initiating a process which leads to the destruction of Cyclin
o Cdk, the non-Cyclin part of MPF, persists in the cell as an inactive form until it associates with new Cyclin molecules synthesized during Interphase of the next round of the cell cycle.
Tracheae - Respiratory Organs Tracheal respiration is characteristic of insects. Onychophorans, diplopods, arachnids, and chilopods as well use tracheal system for respiration
Q. What are the physiological systems known as integrative systems? Why is this designation justified? The integrative systems are the endocrine system and the nervous system.
Q. What are the proteins? How can the protein diversity of living beings be described? Proteins are molecules made of sequences of amino acids bound by a peptide bond. The g
Define Historical example of virulence? The "classical dogma" of epidemiologists was that pathogens all the time evolve in the direction of lower virulence, eventually becoming
Q. What is a nutrient? A nutrient is every substance used in the metabolism and which is obtaining from the diet. For example, essential amino acids and vitamins are nutrients.
C o m p o s t i n g It is a modification of a conventional or solid manure handling system with anaerobic decomposition. Types of composting systems include windrow, b
A Molecule of DNA is 2.17 um long. The ends of the molecule become strongly ionixed: negative on one end, positive on the other. The helical molecule acts like a spring and compres
What is L forms of bacteria?
Some ecosystems possess relatively large number of species as compared to others. This is particularly true of tropical forests which exhibit a very rich-biodiversity. For example,
What is mucoperiosteal flap Silk is easy to handle, ties with a slip knot, and is relatively inexpensive compared with other nonabsorbable suture materials currently available.
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