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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
Q. What is an open circulatory system? Open circulatory system is the one in which blood doesn't circulate only inside blood vessels but it also falls in cavities that irrigate
Q. What are the structures that form the external ear? What is its function? The internal ear comprises the auricle or pinna and the auditory canal its function is to conduct t
The F2 phenotypic ratio from a dihybrid cross with epistasis was 9:3:4. If instead of a dihybrid cross, a double heterozygote was test crossed (crossed to a homozygous recessive in
detailnote on structure of stomach
Molecular Biology - transgenesis Difficult to successfully insert the gene then successfully re-implant embryo possible pleiotropic effects low success rate / tak
phyla of animal like protists that have free living members
What is the difference between an ecological niche and a habitat? An ecological niche is a set of peculiar activities, resources and methods that a species explores to survive
draw a sponge and label
Q What are the different kinds of gas exchange that occur in animals? In beings from the kingdom Animalia the gas exchange may occur either by diffusion, cutaneous respiration,
Nuclear Type - Endosperm The primary endosperm nucleus divides. The cell wall is not laid. These nuclei and their division products form a large number of free nuclei. The fi
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