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•Question 5 3 out of 3 points With regard to DNA repair mechanisms the human body has; •Question 6 3 out of 3 points The genetic mutation which causes sickle cell disease is a change in one amino acid of hemoglobin and is based on one nucleotide mutational change (point mutation). •Question 7 3 out of 3 points Cancer tumors grow and spread by inducing formation of blood vessels to nourish them. This is called; •Question 8 3 out of 3 points