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Chapter 16: 16-3TYU (page 333)

In analyzing the number of different bases in a DNA sample, which would be consistent with the base-pairing rules?

  1. A=G
  2. A+G=C+T.
  3. A+T=G+C.
  4. A=C.

Short Answer

Expert verified
  1. The option 鈥淎=G鈥� is false.
  2. The option 鈥淎+G=C+T鈥� is true.
  3. The option 鈥淎+T=G+C鈥� is false.
  4. The option 鈥淎=C鈥� is false.

Step by step solution

01

Genetic material and DNA

DNA is a molecule made of two strands, such as a leading strand and a lagging strand. It is otherwise known as a double-helical structure.

In the DNA, the sugar molecules are attached to the nucleic acids鈥� bases to form nucleotide bases that are continuously connected to form the DNA sequence.

02

Explanation of option (A)

A=G shows that the number of adenine is equal to the number guanine. In the DNA, the adenine pairs with the thymine bases.

A=G is not correct as per the base-pairing rules. Chargaff rule states there is an equal amount of adenine and thymine present in the DNA.

Therefore, the given statement is false.

03

Explanation of option (B) 

A+G=C+T shows the exact base pairings of the DNA. The amount of adenine and guanine equalizes the amount of cytosine and thymine.

According to the base-pairing rule, the number of bases present in the DNA sample balances the number of bases such as A and G, C and T.

Therefore, the given statement is true.

04

Explanation of option (C)

A+T=G+C is the wrong base pairing as per the base-pairing rule. The amount of adenine and thymine does not equalize the amount of guanine and cytosine.

The number of bases present in the DNA is not consistent with the A+T=G+C.

Therefore, the given statement is false.

05

Explanation of option (D)

The adenine does not have an equal number compared to the cytosine. The amount of cytosine equalizes with the guanine, not with the adenine, as per the Chargaff rule.

A=C does not give the correct number of bases present in the DNA.

Therefore, the given statement is false.

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Most popular questions from this chapter

What is the basis for the difference in how the leading and lagging strands of DNA molecules are synthesized?

  1. Origins of replication occur only at the 5鈥� end.
  2. Helicases and single-strand bindingproteins work at the 5鈥檈nd.
  3. DNA polymerase can join new nucleotides only to the 3鈥檈nd of a pre-existing strand, and the strands are antiparallel.
  4. DNA ligase works only in the 3鈥�5鈥� direction.

Some bacteria may be able to respond to environmental stress by increasing the rate at which mutations occur during cell division. How might this be accomplished? Might there be an evolutionary advantage to this ability? Explain.

What is the relationship between DNA replication and the S phase of the cell cycle?

The continuity of life is based on heritable information in the form of DNA, and structure and function are correlated at all levels of biological organization. In a short essay (100-150words), describe how the structure of DNA is correlated with its role as the molecular basis of inheritance.

Using Chargaff鈥檚 rules, fill in the table with your predictions of the missing percentages of bases, starting with the wheat genome and proceeding through E. coli, human, and ox. Show how you arrived at your answers.
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