What would happen to DNA structure if 2 purines or 2 pyrimidines could pair?

Answer 1

Things would get messed up

Guamines and Adenines - Cytosines and Thymines would start pairing together. They might even pair to themselves.

What would happen , I'm not sure, as of right now it's impossible because the bases don't match.

Answer 2

1. The more ORI (origin of replication) sites there are the more replication forks there are operating simultaneously, speeding up replication. 2. Down syndrome results from having an extra chromosome 21 (due to nondisjunction during meiosis) or from an extra part of chromosome 21 that has been translocated to another chromosome. 3. The primary functions of DNA are to store information needed by the cell to carry out its activities, and to transmit that- information between generations (from parent to offspring). 4. DNA is a double helix. It is two complementary and antiparallel polynucleotide strands hydrogen bonded to each other - the bases point inwards while the sugar and phosphates are on the outside, and form a sugar-phosphate backbone. 5. DNA is a nucleic acid (DNA stands for deoxyribonucleic acid) 6. The monomers of DNA are nucleotides. 7. Purines and pyrimidines are double-ringed and single-ringed (respectively) nitrogen-containing bases. 8. The purines (in regard to DNA) are adenine and guanine. The pyrimidines (in regard to DNA) are cytosine and thymine. 9. A nucleotide has 3 parts. (a) a nitrogenous bas (adenine, guanine, cytosine, and either thymine (in DNA) or uracil (in RNA)) (b) a pentose - 5-carbon sugar (deoxyribose in DNA, ribose in RNA) (c) a phosphate group 10. DNA polymerase's primary function is to extend an existing primer by adding complementary bases to the strand it is synthesizing. 11. DNA helicase 12. 3 differences between DNA and RNA. (a) DNA has the sugar deoxyribose; RNA has the sugar ribose. (b) DNA has the base thymine; RNA has the base uracil. (c) DNA is (almost) always double stranded; RNA is single stranded 13. 3 main types of RNA. (a) mRNA. Messenger RNA carries a complentary copy of the information stored in DNA to the ribosome; the sequence of bases in mRNA determines the sequence that amino acids will be added to a growing polypeptide. (b) rRNA. Ribosomal RNA, along with ribosomal proteins, make up the ribosome. It is part of an rRNA that actually links amino acids together. (c) tRNA. Transfer RNAs carry the correct amino acids to the ribosome; the anticodon on the tRNA is complementary to the codon in mRNA. 14. Deoxyribose is missing one oxygen atom on the 2' carbon. Ribose has a hydroxyl group (-OH) but deoxyribose has just a hydrogen atom. One can think of it as a "deoxied" form of ribose. 15. At one end (the 3' end) of tRNA is the amino acid-acceptor site. At the other end (the 5' end) of tRNA is nothing majorally important. The other major functional part of a tRNA molecule is anti-codon loop, but it is not at either end of tRNA. Now, when tRNA adopts its tertiary structure, one might say that the anti-codon loop is at an "end", but that's not a good description. 16. Proteins are made on ribosomes. A bit more technically, polypeptides are made on ribosomes - the polypeptides then fold into stable, functional 3-D conformations, becoming proteins. 17. mRNA is bound to proteins to form ribonucleoprotein complexes. The adaptor proteins have a NES (nuclear export signal) that targets the complex to nuclear pores, through which export occurs. When mRNA leaves the nucleus, it enters the cytosol, where ribosomes free in the cytosol will bind. 18. RNA polymerase 19. Transcription and translation (although transcription can produce RNAs other than mRNA, rRNA, and tRNA, so it's not tied to protein synthesis, whereas translation is). 20. Okazaki fragments result from discontinuous synthesis on the lagging strand. An enzyme called DNA ligase bonds the fragments together.

Answer 3

You would end up with a mutation in the pattern. Frameshift, missense, etc. However, there are methods in place to excise the mispaired pair, or replace one of the 2 in the pair with the correct pairing.