1. What do thymine (T) and cytosine (C) have in common, that makes them different from Adenine (A), and Guanine (G)? 2. What do A and G have in common that is notably different from T and C? 3. What is the name of the enzyme that add nucleotides to a growing DNA strand? What kind of bonds does this enzyme form between the nucleotides? 4. What is the name of the locations that DNA replication begins along the DNA molecule? 5. Does replication occur in one direction or both directions along the parental (old) strand?
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Choose all the answers below that describe cytosine, thymine, and uracil. - They are pyrimidines. - Cytosine and thymine are found in DNA. - Cytosine and uracil are found in RNA. 2. Choose all the answers below that describe adenine and guanine. - They are purines. - Both are found in DNA. - Both are found in RNA. 3. Which of the pictures below (1, 2, or 3) shows semi-conservative replication? Explain why you chose the picture.
Suman K.
1. What are the three components of a nucleotide? (HINT: What were the three components used in putting the model together? Remember that Adenine, Guanine, Cytosine, and Thymine are all Nitrogen Bases!) Refer to your DNA article if you are still unsure. 2. What is the name of the sugar molecule in the DNA helix? 3. Suppose you know that the sequence of bases on one DNA strand (one side of the DNA ladder) is AGCTCAG. What is the sequence of the bases on the opposite strand? 4. Assume that a 100-base pair DNA double helix contains 45 cytosines. How many adenines are there?
Sri K.
1.What does DNA mean? 2 . DNA is made of repeating units called nucleotides. What are the three parts of a nucleotide? 3. If a particular DNA molecule contained 20 per cent thymine, how much of the molecule would be adenine? How much would be cytosine? 4. Fill in the complementary half of this strand of DNA molecule by using the base-pair -T A CT GT G C G A AT G C A ATT - 5. During the S phase of the cell cycle, DNA copies itself. What is this process called?
Shaiju T.
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