Sickle cell anemia is caused by a mutation that causes the protein hemoglobin to be (built) incorrectly. The consequence of this is that the "sickle" cells can block the flow of blood in small blood vessels (capillaries).
A mutation in the original DNA causes a change in the amino acid sequence, resulting in a misshapen protein molecule.
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Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

What is the identity of the planets?

Fungi are classified into how many groups? a. 1 group b. 2 groups c. 3 groups d. 4 groups