1)If a DNA molecule of 132 base pairs contains 23 adenine bases (A), how many cy
ID: 64947 • Letter: 1
Question
1)If a DNA molecule of 132 base pairs contains 23 adenine bases (A), how many cytosine bases (C) will it have?
2)True or false question: The base cytosine is an example of a purine?
3)Prokaryotic promoters contain the TATA box sequence at the -35 position from the transcription start. True or false
4)Why does DNA synthesis always occur in the 5' to 3' direction?
5)iN BOTH PROKARYOTES AND Eukaryotes , transcription of mRNA terminates precisley at the end of protien-coding sequence? True ir false
6)What would the sequence of an RNA molecule be if the following DNA strand is used as the coding strand 5'TCCGAATCATG?
7)DNA Polymerase require both a template and an existing 3'OH TO initiate synthesis of new DNA? tRUE OR FALSE
8)wHICH of the following represents one strand of a type II resrtiction endonuclease recognition phase?
a)5'AACCTT
B)5'AACCAA
C)5'GATATC
D)5'GAAATC
9)During electrophoresis, to which electrode will the DNA fragments travel?
Explanation / Answer
1). So, these DNA nucleotides otherwise called “bases” carry the message encoding for the synthesis of a protein. There are four such bases, namely, adenine (A), thymine (T), guanine (G), and cytosine (C), which are the building blocks of DNA’s double helical structure. Among these base pairs, adenine binds with thymine and guanine binds with cytosine, this is called as complementary pairing. Both the strands of DNA are equal in length.
Given that, the number of base pairs is 132. Number of adenine are 23, so number of thymine bases is also 23. The remaining 86 bases are guanine and cytosine. Of these 86, 50% i.e. 43 are guanine and another 43 are cytosine. Thus, the number of cytosine bases is = 43.
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