POB EXAM 3 QUESTIONS UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

POB EXAM 3 QUESTIONS UPDATED ACTUAL QUESTIONS
AND CORRECT ANSWERS

Question:
1. DNA does NOT have which of the following characteristics?
A. has a double helix
B. bases held together by hydrogen bonds
C. has a deoxyribose sugar
D. contains adenine, guanine, cytosine, and uracil
Answer:
D. contains adenine, guanine, cytosine, and uracil

Question:
2. Which base is unique to DNA?
A. guanine
B. adenine
C. thymine
D. uracil
Answer:
C. thymine

Question:
3. The individual(s) credited with the discovery of the structure of DNA is (are)
A. James Watson and Francis Crick.
B. Erwin Chargaff.
C. Rosalind Franklin and Maurice Wilkins.
D. Charles Darwin and Gregor Mendel.
Answer:
A. James Watson and Francis Crick.

Question:
4. In semiconservative DNA replication, each new double helix formed will have
A. two new strands and two old strands.
B. one new and one old strand in each helix.
C. two new and one old strand in one helix and two old and one new strand in second helix.
D. two new strands in one helix and two old strands in the other helix.
Answer:
B. one new and one old strand in each helix.

Question:
5. Because one original strand of the double-stranded helix is found in each daughter molecule, the
replication process is called
A. proofreading.
B. semi-conservative.
C. freeing of DNA.
D. mutation positive.

,Answer:
B. semi-conservative.

Question:
6. The enzyme that reads the template strand and makes a complementary strand of DNA is
A. DNA polymerase.
B. RNA polymerase.
C. helicase.
D. ribozyme.
Answer:
A. DNA polymerase.

Question:
7. The _____ enzyme is responsible for unwinding the double-helix structure of DNA during replication.
A. helicase
B. polymerase
C. extendase
D. windase
Answer:
A. helicase

Question:
8. Which does NOT describe a function of the DNA polymerase molecule?
A. recognize the free nucleotide that pairs with the base on the old strand of DNA
B. read the strand of old DNA and recognize the base there
C. proofread to ensure that the proper base has been incorporated
D. synthesize the proper nucleotide to match with the base read on the old strand
Answer:
D. synthesize the proper nucleotide to match with the base read on the old strand

Question:
9. Which of the classes of RNA molecules carries the genetic information from the nucleus as it is needed
for the construction of a protein?
A. ribosomal RNA
B. transfer RNA
C. messenger RNA
D. nuclear RNA
Answer:
C. messenger RNA

Question:
10. The function of transfer RNA is to
A. carry amino acids to ribosomes.
B. transmit coded information to the cytoplasm.
C. turn DNA on and off.
D. act as the site for protein synthesis.

,Answer:
A. carry amino acids to ribosomes.

Question:
11. Which of the classes of RNA molecules carries the amino acids that are added to the growing
polypeptide chain?
A. ribosomal RNA
B. transfer RNA
C. messenger RNA
D. ribozyme
Answer:
B. transfer RNA

Question:
12. The ______ contain(s) the information for the structure of the protein.
A. introns
B. exons
C. promoter
D. ribosomes
Answer:
B. exons

Question:
13. An intervening sequence of DNA that is NOT expressed is called a(n)
A. exon.
B. intron.
C. replicon.
D. gene.
Answer:
B. intron.

Question:
14. During the process of transcription, the information in
A. a protein is converted into RNA information.
B. RNA is converted into protein information.
C. RNA is converted into DNA information.
D. DNA is converted into RNA information.
E. DNA is converted into protein information.
Answer:
D. DNA is converted into RNA information.

Question:
15. Which is the process that synthesizes mRNA?
A. translation
B. transcription
C. transformation
D. translocation

, Answer:
B. transcription

Question:
16. The correct sequence of events in the production of a polypeptide is
A. initiation - termination - elongation.
B. elongation - termination - initiation.
C. elongation - initiation - termination.
D. initiation - elongation - termination.
Answer:
D. initiation - elongation termination.

Question:
17. Which is the process by which a protein is constructed in the cytoplasm of eukaryotic cells?
A. translation
B. transcription
C. transformation
D. translocation
Answer:
A. translation

Question:
18. If the normal nucleotide sequence was TACGGCATG, what type of gene mutation is present if the
resulting sequence becomes TAGGCATG?
A. germinal mutation
B. addition mutation
C. deletion mutation
D. substitution mutation
Answer:
C. deletion mutation

Question:
19. Which of the following is NOT a frameshift mutation of the nucleotide sequence CATUAUCCC?
A. ATUAUCCC
B. CTUAUCCC
C. CATUAUCGC
D. CCATUAUCCC
Answer:
C. CATUAUCGC

Question:
20. In the above diagram of DNA, notice the three chemical bond in the center image labeled "A", "B" and
"C". The bond represented by a dotted line below the letter "A"
A. ionic bond.
B. covalent bond.
C. hydrogen bond.