BIO 121 General Biology Molecular Biology Student Name Score Project I DNA and D

Question

BIO 121 General Biology Molecular Biology Student Name Score Project I DNA and DNA Synthesis 1. Where is DNA located in the eukaryotic cell? In the prokaryotic cell? 2. What are the four nitrogenous bases for DNA? 3. Name the two purines: 4. Name the two pyrimidines: 5. What is the name of the attractive force between a purine of one strand of DNA and a pyrimidine on the opposite strand of DNA? 6. True or false? Direction of the two strands making up DNA, is as follows: 7. When is DNA duplicated? [Hint: think cell cycle!] 8. What is(are) the name(s) of the enzymes involved with DNA synthesis? 9. For one DNA strand with the following base sequence, give the appropriate complementary base sequence for the other strand. 3'-S-P-S-P-S-P-S-P-S-P-S-P-S-P-S-P-S-5' ATT CC GAG C 5-S-P-S-P-S-P-S-P-S-P-S-P-S-P-S-P-S-3 10. What are introns and exons? 11. What if there are "mistakes" in the DNA base sequence? Are there repair mechanism? If so, what are they? 12. Describe the steps involved with DNA synthesis. Page 1 of 6

Explanation / Answer

1. In Eukaryotic cell: Nucleus

In prokaryotic cell: Cytoplasm as Prok. dosent have nucleus

2. Adenine, Guanine, Thymine and Uracil

3. Adenine and Guanine

4. Cytiosine and Thymine

5. Hydrogen bond

6. False

7. In S-phase of cell cycle

8. DNA Polymerase, ligase, topoisomerase, Primase, etc.

9. 5' TAAGGCTCG3'

10. In Eukaryotes, Introns are nonccoding part of DNA and Exons are the coding part of DNA.

11. There are repair mechanism are present like, Nucleotide excision repair, mismatch repair, recombination repair, etc. Type of mechanism needs to be use for repair strictly depends on the type of mistake in DNA.

12. Question information is not available

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