Bio Homework 7 Questions

If one strand of a DNA is 5′ ATCGTTAAGCGAGTCA 3′, then the complementary strand would be:

5′ TAGCAATTCGCTCAGT 3′.

Because the 2 strands of a DNA molecule run in opposite directions, they are said to be bidirectional.

False

DNA polymerases can add new DNA nucleotides only to the 5' end of an existing strand.

False

The DNA strand that grows away from the replication fork is synthesized continuously from one initial primer.

False

The DNA strand that grows toward the replication fork is synthesized discontinuously in short pieces called Okazaki fragments.

False

The DNA strand that is synthesized continuously is called the lagging strand.

False

The DNA strand that is synthesized discontinuously is called the leading strand.

False

DNA ligase joins adjacent Okazaki fragments together into a complete strand.

True

DNA polymerase I removes the RNA primer and synthesizes a short sequence of DNA that will base pair with the parent strand of DNA.

True

DNA polymerases cannot initiate synthesis of a new DNA strand; they can only add bases to an existing strand.

True

Each Okazaki fragment has its own primer.

True

In the genetic code, one codon

consists of three bases. specifies a single amino acid.

Changing the codon AGC to AGA represents a:

missense mutation.

During translation, the codon in mRNA is actually "read" by

the anticodon in a tRNA.

A mutation that changes a thymine nucleotide to a guanine nucleotide is a(n):

transversion.