For each of the following statements, indicate whether the statement is true or false.

1		Proteins, whose primary function is to destroy or neutralize foreign substances, are called enzymes.
			A)	TRUE
			B)	FALSE
2		A person whose blood contains the antibodies anti-A and anti-B would be of the blood type O.
			A)	TRUE
			B)	FALSE
3		Genes always exist in two forms, or alleles.
			A)	TRUE
			B)	FALSE
4		A Y-linked trait is passed down from a father to half of his sons but none of his daughters.
			A)	TRUE
			B)	FALSE
5		Hemophilia is an X-linked trait. If a woman who is a carrier marries a normal man, the proportion of their male offspring that would be expected to have hemophilia is one-half.
			A)	TRUE
			B)	FALSE
6		Down syndrome is caused by an extra X chromosome.
			A)	TRUE
			B)	FALSE
7		A person with two X chromosomes could be phenotypically male under certain conditions.
			A)	TRUE
			B)	FALSE
8		Clones are exact duplicates of the donor.
			A)	TRUE
			B)	FALSE
9		It is estimated that the entire human genome contains three billion base pairs.
			A)	TRUE
			B)	FALSE
10		Amniocentesis is a technique for determining if the parents are carriers of a genetic disease.
			A)	TRUE
			B)	FALSE