The sickle form of the hemoglobin gene is created when an adenine nucleotide is changed to a thymine. ... That single amino acid replacement in the -globin protein alters the shape and the chemistry of the hemoglobin molecule, causing it to polymerize and distort the red blood cell into the sickle shape.
D: Where two continental plates are colliding, creating a convergent boundary. One plate slips under the other because of convection currents in the mantle.
Answer:
Other cells.
Explanation:
All cells come from other cells as cells are "produced" when a cell divides into two.
Your nervous system quickly responds to the threat and sends a signal to your brain which causes your muscles/ body to react.
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