1. Sect. 9.2: “The Struct. Of DNA” Sect. 9.3: “DNA Replication”
Ch. 9 Test Prep.
Sect. 9.2: “The Struct. Of DNA”
Sect. 9.3: “DNA Replication”

2. In 1953, Watson and Crick built a model of DNA with the configuration of a _____.
A. double helix B. circle C. single helix D. triple helix

3. A _____ is a segment of DNA that codes for a particular protein which in turn codes for a trait.
A. mutation
B. nitrogen base
C. phosphate group
D. gene

4. Where in the cell are chromosomes located?
A. Chromosomes are found in the nucleus.
B. Chromosomes are found in the cytosol.
C. Chromosomes are found in the Golgi bodies.
D. Chromosomes are found in the nucleolus.

5. DNA can be found in what two organelles?
A. mitochondria and ribosomes
B. mitochondria and lysosomes
C. mitochrondria and chloroplasts
D. chloroplasts & ribosomes

6. Why is messenger RNA (mRNA) necessary?
A. DNA is too big to go through the nuclear pores. B. The messenger RNA (mRNA) is small enough to go through the nuclear pores. C. Both A and B are correct. D. Neither A nor B are correct.

7. Which of the following is not part of a DNA nucleotide?
A. double helix
B. nitrogen base
C. five-carbon sugar
D. phosphate group

8. Proteins are made where in the cell?
A. Golgi body
B. Ribosomes
C. Golgi apparatus
D. Both A & B are correct.

9. DNA takes about _____ to replicate.
A. 8 minutes
B. 33 days
C. 8 seconds
D. 8 hours

10. Replication forks tend to _____.
A. increase errors during replication
B. be more plentiful in prokaryotic DNA
C. slow down replication
D. speed up replication

11. A. short chain B. triple helix C. long chain D. ring
The shape of DNA found in bacteria, mitochondria, and chloroplasts is best described as a _____.
A. short chain B. triple helix C. long chain D. ring

12. A. DNA replication B. DNA polymerases C. DNA helicases
Enzymes that open the double helix by breaking hydrogen bonds between nitrogen bases are known as _____.
A. DNA replication
B. DNA polymerases
C. DNA helicases
D. replication forks

13. DNA is replicated before _____.
A. division
B. the G1 phase
C. crossing-over
D. cell death

14. Which of the following happens last in replication?
A. Two original strands of DNA separate.
B. DNA polymerase adds nucleotides to each DNA strand.
C. Two new DNA molecules form.
D. A replication fork forms.

15. The areas where DNA separates during replication are called _____.
A. Polymerases B. proofreaders. C. helicases. D. replication forks.

16. At the end of replication, each new DNA molecule is composed of _____.
A. two original strands of DNA
B. a new and an original strand of DNA.
C. two new strands of DNA.
D. either two new or two original strands of DNA.

17. Which of the following proofreads the new DNA molecules during replication?
replication forks
the original strand of DNA
DNA polymerases
DNA helicases

18. Chargaff _____.
A. discovered the enzyme that unwinds the DNA double helix
B. showed that A - T and C - G
C. credited with discovering the structure of DNA
D. enzyme responsible for catalyzing the DNA

19. Which of the following researchers took key photographs of DNA?
A. Crick B. Chargaff C. Watson D. Franklin and Wilkins

20. A. DNA C. RNA B. ATP D. NADPH C. RNA
A particular nucleotide is composed of ribose sugar, uracil, and a phosphate group. Identify the biomolecule it belongs to.
A. DNA C. RNA B. ATP D. NADPH C. RNA

21. A. CTTGTAGTC C. CTTGTUGTC B. CUUGUAGUC D. CTTCTUGTC A. CTTGTAGTC
The image below shows one of the strands of a double stranded DNA molecule. Which of the answer options represents the correct complementary strand of DNA?
A. CTTGTAGTC C. CTTGTUGTC B. CUUGUAGUC D. CTTCTUGTC A. CTTGTAGTC

22. Identify the following biomolecule.
A. Carbohydrate C. Protein
B. ATP D. Nucleotide
D. Nucleotide

23. Which of the following is a base present in RNA but absent in DNA?
A. Guanine C. Cytosine B. Adenine D. Uracil D. Uracil

24. Which of the following is present in DNA but absent in RNA?
A. Deoxyribose sugar C. Phosphate group B. Adenine base D. Guanine base A. Deoxyribose sugar

25. Use the following diagram to answer the question.
Which number represents a nucleotide? 4

26. Which of the below listed features does a DNA molecule share with an RNA molecule?
A. Nitrogenous base B. 5 carbon sugar C. Phosphate group D. Double helical structure A, B and C

27. Which of the following correctly represents the chemical composition of a nucleotide?
A. A sugar and a nitrogenous base B. A sugar, a nitrogenous base, and a phosphate group C. A polymer of nitrogen bases D. A nitrogenous base and a phosphate group

28. What nitrogen base is incorporated in a RNA nucleotide, but not in a DNA nucleotide?
A. Adenine
B. Cytosine
C. Uracil
D. Guanine

29. What is the name of the enzyme responsible for adding complementary nucleotides to the exposed nitrogen bases during DNA replication? It also has a proofreading role.
A. RNA helicase C. DNA helicase B. RNA polymerase D. DNA polymerase D. DNA polymerase

30. Nucleotides are held together by what bonds?
James Bond
B. metallic bonds
C. covalent bonds
D. Ionic bonds

31. A. 3 and 4 C. 4 and 1 B. 2 and 5 D. 1 and 6 B. 2 and 5
The image below shows a DNA double helix. Which of the base pairs are wrongly represented?
A. 3 and 4 C. 4 and 1 B. 2 and 5 D. 1 and 6 B. 2 and 5

32. Nucleotides come together to form what kind of DNA structure?
A. double helix B. stem helix C. twisted helix D. compound helix

33. Use the following diagram to answer the question.
Which number represents complementary base pairing? 1

34. With regards to the nitrogen bases, how are they paired to evidently connect nucleotides to one another?
A. A pairs with G, T pairs with C B. A pairs with T, G pairs with C C. T pairs with G, A pairs with C D. None of the nitrogen bases are able to pair

35. Which nitrogen bases within a nucleotide are considered purines and which are considered pyrimidines?
A. A and C are purines, T and G are pyrimidines B. A and T are pyrimidines, G and C are purines C. A and G are pyrimidines, T and C are purines D. A and G are purines, T and C are pyrimidines

36. What is the name of the enzyme responsible for splitting the hydrogen bonds that hold the DNA double helix together?
A. RNA helicase C. DNA helicase B. RNA polymerase D. DNA polymerase C. DNA helicase

37. Use the following diagram to answer the question.
Which number represents a 5-Carbon Sugar? 2

38. AATCGGTAGC A. TTAGCCATCG B. GCATTGATGG C. AATCGGTACT D. CGGTACGTAA
The following strand of nucleotides are provided to you, what would be the complementary strand of nucleotides?
AATCGGTAGC A. TTAGCCATCG B. GCATTGATGG C. AATCGGTACT D. CGGTACGTAA

39. Use the following diagram to answer the question.
Which number represents a phosphate group? 3