DNA, RNA, Protein Synthesis

Tyra made a mistake while she was creating her chart. Which best identifies the mistake Tyra made?

• DNA is single-stranded while RNA is doublestranded.

• DNA remains in the nucleus while RNA leaves the nucleus.

• DNA contains a ribose sugar while RNA contains a deoxyribose sugar.

• DNA has bases of A, G, C, and U while RNA has bases of A, G, C, and T.

Which of the following would represent the strand of DNA from which the mRNA strand CUCAAGUGCUUC was made?

• CUCAAGUGCUUC

• GAGUUCACGAAG

• GAGTTCACGAAG

• AGACCTGTAGGA

What is the first step of DNA replication?

• Free nucleotides bond together in the correct sequence.

• A single-stranded RNA molecule forms.

• The DNA transfers its information to RNA through an amino acid.

• The DNA molecule unzips along weak hydrogen bonds.

Based on information in the chart, what are the three-letter code words for each of the stop codons, which signal the end of a polypeptide chain?

• UAA, UAG, UGA

• UGG, UAG, UGA

• CAA, CAG, CGA

• AUA, AUG, AAU

Where does translation in prokaryotes occur?

• in the endoplasmic reticulum

• at the ribosomes

• outside the cell

• in the nucleus

In the chart, which amino acid is specified by the mRNA code CCC?

• alanine

• lysine

• glycine

• proline

What is a major difference between messenger RNA molecules and transfer RNA molecules?

• Messenger RNA molecules function when they are double-stranded, and transfer RNA molecules function when they are singlestranded.

• Messenger RNA molecules contain ribose, and transfer RNA molecules contain deoxyribose.

• Messenger RNA molecules contain thymine, and transfer RNA molecules contain uracil.

• Messenger RNA molecules carry coded information to the ribosomes, and transfer RNA molecules carry amino acids to the ribosomes.

How many nucleotides make up a codon of mRNA?

• 1

• 2

• 3

• 4

What is the process by which DNA copies itself into new cells?

• translation

• transcription

• replication

• duplication

What is the function of helicase?

• It forms bonds between DNA nucleotides

• It adds new nucleotides to the DNA helix

• It forms the DNA helix.

• It separates DNA strands.