Question 1

Which scientist(s) is/are noted for their X-ray diffraction photo of DNA?

Accepted Answer

A)   Chargaff
B)   Griffith
C)   Messelson and Stahl
D)   Franklin
E)   Hershey and Chase D

Question 2

Indicate the complementary nucleotide sequence for the following section of DNA: AATGCGTATACG

Accepted Answer

DNA forms a complementary sequence based on Chargaff's rule (A-T, C-G). Thus, the complementary nucleotide sequence would be TTACGCATATGC.

Question 3

After their experiment, Hershey and Chase concluded that the radioactively labeled sulfur, but not the phosphorus, was found within the bacteria.

Accepted Answer

A) True 
 B)False  False

Question 4

Which of the following describes the flow of information in protein synthesis?

Accepted Answer

A)   protein → RNA → DNA
B)   DNA → RNA → protein
C)   DNA → protein → RNA
D)   RNA → DNA → protein
E)   RNA → protein → DNA

Question 5

A sequence of mRNA that is removed during processing is a(n)

Accepted Answer

A)   exon.
B)   intron.
C)   replicon.
D)   promoter.
E)   gene.

Question 6

The hereditary material found in all cells is

Accepted Answer

A)   DNA.
B)   rRNA.
C)   mRNA.
D)   tRNA.
E)   ATP.

Question 7

If a species contains 23% A in its DNA, what is the percentage of guanine it would contain?

Accepted Answer

A)   23%
B)   46%
C)   25%
D)   44%
E)   27%

Question 8

Tumor-suppressor genes are

Accepted Answer

A)   oncogenes that code for proteins that inhibit cell division.
B)   genes that code for proteins that inhibit cell division.
C)   oncogenes that code for proteins that stimulate cell division.
D)   anti-oncogenes that code for proteins that stimulate cell division.
E)   transposons that can be used as cancer therapy.

Question 9

A gene is physically located on a(n)

Accepted Answer

A)   chromosome.
B)   transfer RNA.
C)   enzyme.
D)   protein.
E)   nucleus.

Question 10

Which of the following is true about cancer cells?

Accepted Answer

A)   They exhibit uncontrolled growth.
B)   They can form benign or malignant tumors.
C)   They exhibit disorganized growth.
D)   They may undergo metastasis.
E)   All of the answer choices are true statements about cancer.

Question 11

Which of the following statements about DNA replication is correct?

Accepted Answer

A)   As hydrogen bonds break, the DNA molecule unwinds.
B)   The process is known as semiconservative replication because one old strand is conserved in the new molecule.
C)   The enzyme that catalyzes DNA replication is DNA polymerase.
D)   Complementary base pairs are held together with hydrogen bonds.
E)   All of the answer choices are correct statements about DNA replication.

Question 12

Which of the following levels of control involves the use of a poly-A tail?

Accepted Answer

A)   pretranscriptional
B)   transcriptional
C)   posttranscriptional
D)   transcriptional control
E)   translational

Question 13

Which of the following is true about DNA?

Accepted Answer

A)   transfers messages to the ribosomes
B)   contains the sugar ribose
C)   contains adenine, guanine, uracil, and cytosine
D)   is single stranded
E)   forms a helix

Question 14

The enzyme that is used to join DNA nucleotides together is

Accepted Answer

A)   DNA polymerase.
B)   RNA polymerase.
C)   helicase.
D)   primase.
E)   lipase.

Question 15

Which of the following bases pairs with adenine in DNA?

Accepted Answer

A)   guanine
B)   adenine
C)   thymine
D)   uracil
E)   cytosine

Question 16

Which of the following is part of DNA replication?

Accepted Answer

A)   transcription
B)   lagging strand
C)   translation
D)   amino acids
E)   protein synthesis

Question 17

Specific DNA sequences that have the ability to move within and out of chromosomes are called

Accepted Answer

A)   transposons.
B)   introns.
C)   exons.
D)   operators.
E)   ribozymes.

Question 18

The fact that for a given species the amount of purines in the DNA always matches the number of pyrimidines was first determined by

Accepted Answer

A)   Watson and Crick.
B)   Franklin and Wilkins.
C)   Hershey and Chase.
D)   Chargaff.
E)   Mendel.

Question 19

Which type of RNA carries the genetic information from the nucleus to the ribosome?

Accepted Answer

A)   ribosomal RNA
B)   transfer RNA
C)   messenger RNA
D)   All types of RNA can carry the information from the nucleus to the ribosome.

Question 20

Hershey and Chase experimented with radioactively labeled phosphorus and sulfur to determine that DNA and not protein is the genetic material. Which of the following was essential to the success of the experiment?

Accepted Answer

A)   Sulfur is present in amino acids in the protein coat of bacteria.
B)   Phosphorus is present in high amounts in DNA.
C)   Sulfur is not present in DNA.
D)   Phosphorus is not present in amino acids in the protein coat of bacteria.
E)   All of the answer choices describe information that was necessary for the success of the experiment.

Exam 25: Dna Structure and Gene Expression