Final Exam Review: DNA, DNA Replication, and PS

What must match in order for amino acids to be linked into a protein by the ribosome?

• DNA codon and mRNA codon

• mRNA codon and rRNA codon

• DNA codon and tRNA anti-codon

• mRNA codon and tRNA anti-codon

Which is an accurate description of how DNA is replicated?

• The two strands of DNA are “unzipped” and each serves as a template for a complementary DNA strand.

• The two strands are “unzipped” and each is used to make a new DNA strand before being put back together.

• The nucleotides of both strands of DNA are taken apart and used to assemble two completely new DNA molecules.

• The nucleotides of one strand of DNA are taken apart to form a new DNA molecule, then it’s replaced by free nucleotides.

What aspect of the DNA molecule encodes hereditary information concerning an organism’s traits?

• the molecular mass

• the sequence of base pairs

• the distribution of electrical charges

• the folded three-dimensional shape

For all cells where protein synthesis occurs, which base pair is found only in mRNA?

• uracil : adenine

• adenine : thymine

• cytosine : guanine

• cytosine : uracil

A DNA strand undergoing replication contains the bases TACGTT. Which complementary strand does it produce?

• AUCGAA

• ATGCAA

• ATCGAA

• AUCGTT

Which best represents the sequence of bases on mRNA?

• A U C G

• A T U G

• A T C G

• U T C G

Which image correctly represents a strand of human DNA? (hint: pay attention to the base pairing!)

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An RNA codon chart is shown.

For which amino acid sequence does the RNA sequence AUAACU code?

• isoleucine-threonine

• isoleucine-serine

• methionine-threonine

• methionine-serine

How many amino acids can be represented by a single 3-base DNA sequence?

• 1

• 3

• 6

• 8

Which statement best describes the relationship that exists among proteins, DNA, and cells?

• Proteins combine to produce cells, which produce DNA.

• Proteins are made up of DNA, which determines the cells that are produced.

• DNA is made up of proteins, which tell a cell how to function.

• Cells contain DNA, which controls the production of proteins.