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DNA damage caused by ultraviolet light: 1. Cyclobutane-type pyrimidine dimer is the major photoproduct formed 2. A second product, 6-4 photoproduct, is formed in about 10 % of UV induced pyrimidine dimmers 3. Cyclobutane type dimer can be reversed by a process known as photoreactivation (a) this is carried out by an enzyme known as DNA photolyase (photoreactivating enzyme) (b) significance of photolyase enzyme in humans is questionable 4. DNA photoproducts can also be repaired by excision repair
Define Disadvantages of Using the Plate Counts Method? 1. It takes time, usually 24 hours or more is required to obtain visible colonies. 2. Microbial count obtained depends
Checkpoints and Cell Cycle Control Cell cycle checkpoints are control mechanisms which ensure the fidelity of cell division within eukaryotic cells. These checkpoints confirm w
X-Linked Traits in Humans Let us first examine traits determined by genes on the X-chromosome, or the X-linked traits. The human X chromosome contains many genes that are requi
dinstictive characteristics,classes of the kindom
Q What are pneumatic bones? Birds have lightweighted bones with internal spaces filled with air. These bones are called pneumatic bones this feature reduces the corporal densit
Cori Cycle Skeletal muscles have some mitochondria, yet are competent of vigorous activity. as a output, the little stores of oxygen are rapidly depleted, causing the muscle ti
Define Harvard Step Test - aerobic capacity? In this test, the subject steps on and off an 18-inch platform at a rate of 30 times per minute. The evaluator records the subject'
Phylum Ciliophora 1) They have cilia at some stage in the life-cycle. The cilia are used for locomotion or creating a feeding current. 2) They feed heterotrophically usually
Q. What is visual accommodation? Visual accommodation is the phenomenon of varying the curvature of the crystalline lens to make possible the difference of its refractivity to
Which of the following sugars does NOT contains an O-glycosidic bond? Select one: a. amilose b. amylopectin c. glycogen d. cellulose
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