Bio 156 SM Quiz lesson 8

Translation is terminated when a stop codon is presented at the ________ site. A) A B) P C) E D) either A or B E) either A or C

A) A

DNA replication results in two identical daughter molecules each consisting of one old (original) strand and one newly-synthesized strand. A) True B) False

A) True

Synthesis of a new strand of messenger RNA is in the 5' to 3' direction. A) True B) False

A) True

The point where separation of the DNA occurs is called the replication fork. A) True B) False

A) True

The genetic material in bacteria is A) double-stranded DNA. B) double-stranded RNA. C) single-stranded DNA. D) single-stranded RNA. E) either A or B

A) double-stranded DNA.

The segment of the DNA molecule where messenger RNA synthesis begins is called the... A) promoter region. B) sigma factor. C) transcription terminator. D) polymerase. E) template.

A) promoter region.

Which of the following statements about DNA replication is TRUE? A) the leading strand is replicated continuously, while the lagging strand is replicated discontinuously B) the leading strand is replicated discontinuously, while the lagging strand is replicated continuously C) both the leading and lagging strands are replicated continuously D) both the leading and lagging strands are replicated discontinuously E) each of the leading and lagging strands is replicated both continuously and discontinuously

A) the leading strand is replicated continuously, while the lagging strand is replicated discontinuously

DNA replication does not require a template. A) True B) False

B) False

The bacterial chromosome is linear. A) True B) False

B) False

The codon of tRNA is complementary to the anticodon of mRNA. A) True B) False

B) False

The first amino acid enters through the A site. A) True B) False

B) False

The synthesis of messenger RNA is called translation. A) True B) False

B) False

DNA replication in bacteria begins at A) a single origin and proceeds in one direction. B) a single origin and proceeds in both directions. C) two origins and proceeds in both directions. D) many origins and proceeds in one direction. E) many origins and proceeds in one direction.

B) a single origin and proceeds in both directions.

The enzyme ________ unzips and unwinds the DNA molecule. A) DNA polymerase B) helicase C) primase D) DNA ligase E) unzipase

B) helicase

DNA replication is said to be A) dispersive. B) semi-conservative. C) conservative. D) liberal. E) none the above

B) semi-conservative.

The name of the structure that causes the synthesis of RNA to cease is called the... A) promoter region B) sigma factor C) transcription terminator D) polymerase E) template

C) transcription terminator

The complimentary messenger RNA strand that would be synthesized from the DNA base sequence of CTGAC would be... A) GACTG B) UGACU C) AGTUG D) GACUG E) GACGU

D) GACUG

Translation is the synthesis of A) mRNA from DNA. B) mRNA from proteins. C) proteins from DNA D) proteins from mRNA E) proteins from tRNA

D) proteins from mRNA

At which of the following level(s) can gene expression be regulated in eukaryotes? A) passage of mRNA through the nuclear membrane B) destruction of the mRNA C) rate of protein synthesis D) A and B E) A, B and C

E) A, B and C

Which of the following are limitations of DNA polymerase? A) it can only add bases to the exposed 5' end of a pre-existing strand B) it can only replicate the leading strand C) it can only replicate the lagging strand D) all of the above E) none of the above

E) none of the above

Which of the following occurs as the ribosome shifts down the mRNA by a distance of three nucleotides? A) the tRNA that was in the A site moves into the E site B) the tRNA that was in the P site moves into the A site C) the tRNA that was in the E site moves into the P site D) the tRNA that was in the E site moves into the A site E) the tRNA that was in the P site moves into the E site

E) the tRNA that was in the P site moves into the E site

The addition of a phosphate to a protein after it is produced is an example of post-transcriptional modification. A) True B) False

False

The exons of eukaryotic mRNA are removed and the introns are spliced together. A) True B) False

False

As helicase unwinds the DNA molecule, the separated strands are kept apart by DNA polymerase.

b) False

DNA replication can begin at any site along the DNA molecule.

b) false

Arrange the following proteins in the proper order in which they participate in DNA replication. 1 = Primase 2 = Helicase 3 = Single-strand binding proteins 4 = DNA polymerase

c) 2314

The short DNA segments formed on the discontinuously replicated strand are called Kawasaki fragments. Nagasaki fragments. Miyazaki fragments. Okazaki fragments. Suzuki fragments.

d) Okazaki fragments.

What is the function of the enzyme primase during DNA replication? to unwind the double helix to prime it for replication to prime DNA for replication by preventing the formation of knots to add a DNA primer to enable replication of DNA to add a RNA primer to enable replication of DNA to correct errors made during DNA replication

d) to add a RNA primer to enable replication of DNA

RNA polymerase binds to the A) operator. B) promoter. C) regulator. D) terminator. E) enhancer.

promoter.

The most efficient control of eukaryotic gene expression is achieved at the level of A) replication. B) transcription initiation. C) post-transcription. D) translation initiation. E) post-translation.

transcription initiation