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Bidirectional DNA Replication (Quiz 2)

What is semiconservative replication? DNA is double stranded molecule. Only one strand codes for proteins at any given point in the molecule. However, both strands are used during DNA replication. Each of the four bases in DNA (adenine, thymine, guanine, and cytosine) binds to a unique complementary base on the other strand. Therefore the base sequence on one strand determines the complementary sequence on the other strand. During DNA replication the two strand separate from one another and each strand has a new complementary strand built onto it. This form of replication is called semiconservative; each new DNA molecule is composed of one conserved strand from the original molecule and one new strand.

View the animation below, then complete the quiz to test your knowledge of the concept.

1DNA replication begins at a specific site called the
B)start codon

2In DNA replication
A)both strands replicate in the same direction
B)each strand replicates in a different direction
C)only one strand of DNA is used as a template
D)a single strand of DNA is copied to make two single strands of DNA

3Semiconservative replication of DNA means
A)only one strand is used as a template
B)a double-stranded DNA is split into two single-stranded DNAs
C)only half the genes are copied into the new cells
D)each DNA made contains one old strand and one new strand of DNA

4After DNA replication two identical DNA molecules are formed.

5One DNA strand is used as the template to make two new strands of DNA.

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