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Chapter 17: Q. 17.120 (page 616)

Why are there no base pairs in DNA between adenine and guanine or thymine and cytosine? (17.3)

Short Answer

Expert verified

Two purines and two pyrimidines combined would just take up too much room in the region between the two strands.

Step by step solution

01

Step 1:Given information

We have to find out the why are there no base pairs in DNA between adenine and guanine or thymine and cytosine.

02

Step 2:Explanation

Two purines and two pyrimidines would take up far too much room to fit between the two strands. Only adenine and thymine, as well as cytosine and guanine, may form hydrogen bonds in that region.

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Most popular questions from this chapter

What is a point mutation?

What amino acid is coded for by each of the following mRNA codons?

a. CCA b. AAC c. GGU d. AGG

Identify each of the following bases as a purine or a pyrimidine:

a. thymine

b.

Consider the following segment in mRNA, which is produced by normal order of DNA nucleotides -ACAUCACGGGUA-

  1. What is the amino acid order produced from the mRNA?
  2. What is the amino acid order if a mutation changes UCAto ACA?
  3. What is the amino acid order if a mutation changes CGGto GGG?
  4. What is the amino acid order if a mutation changes UCAto UAA?
  5. What happens if a Gis added to the beginning of the mRNAsegment?
  6. What happens if the A is removed from the beginning of the mRNAsegment?

What are the possible codons for each of the following amino acids?
a. valine
b. arginine
c. histidine
See all solutions

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