In DNA double helix, the two DNA chains are held together by covalent bonds betw
ID: 164410 • Letter: I
Question
In DNA double helix, the two DNA chains are held together by covalent bonds between the pair of bases hydrogen bonds between the pair of bases C ionic bonds between the pair of bases none of the above the following double-stranded DNA contains sequence of a eukaryotic gene: 5'GCCATGGCCTTCACACAGGAAACAGCTATGGCCATGAG CACGC 3'-CGGTACCGGAAGT GT GT CCTTT GTCGATACCGGTACTC GTGCG What are the first 12 nucleotides of the resulting mRNA? Indicate the 5' and 3' ends of the mRNA. Consider each of the following three mutations independently. How would the resulting protein change if the underlined G/C base pair at position 22 (1) was deleted from the DNA sequence? How would the resulting protein change if the underlined A/T base pair at position 31 was deleted from the DNA sequence? If the mutation at position 1 occurred on ONLY one of the alleles of RAS. would the cell become cancerous?Explanation / Answer
Answer:
18. B
The structure is very stable and it occurs because the DNA base pairs are able to interact with other bases in a very specific pattern, an A base on one strand will always pair with a T base on the other strand, the C base will always pair with a G.
These combinations (A/T) and (G/C) are called base pairs. The two DNA strands are held together by interchain hydrogen bonds. H-bonds pair the bases in one chain to the complementary bases in the other chain. (A pairs with T and G pairs with C).