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Sickle cell anemia results from a mutation in a gene called HBB, which contains the blueprint for cells to make part of a protein called hemoglobin. The hemoglobin protein is made up of two alpha chains and two beta chains.
Sickle cell anemia is the result of a point mutation, a change in just one nucleotide in the gene for hemoglobin. This mutation causes the hemoglobin in red blood cells to distort to a sickle shape when deoxygenated. The sickle-shaped blood cells clog in the capillaries, cutting off circulation.
Answer:
Nicolas Copernicus argued that the sun was the center of the universe.
Explanation:
the only true statement from the given options is that Nicolas Copernicus argued that the Sun was the center of the universe. He proposed the Heliocentric model. He believed the Sun to be the center and every other object - planets , stars revolved about the Sun.
Answer:
B
Explanation:
The moon won't completely disappear, but it will be cast in an eerie darkness the makes it easy to miss if you were not looking for the eclipse.
Marfan syndrome is a rare disease of the connective tissue, which affects different structures, including skeleton, lungs, eyes, heart and blood vessels.
It is characterized by an unusual increase in limb length. It is believed to affect one in 5,000 people. Unlike other genetic problems, it does not negatively affect intelligence.
