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- in the DNA of certain bacterial cells, 13% of the nucleotides are adenine. What are the percentages of the other nucleotides?6. a.) Which part (sugar, phosphate, or nitrogenous base) of the four types of nucleotides differ? b.) Based on the complementary base pairing rules we know that: A(denosine) pairs with _________ , and that G(uanine) pairs with _________.if the guanine content of certain segment of double-stranded DNA is 22% what is the adenine content?
- Given the choices,a. 25b. 18c. 23d. 21how many hydrogen bonds are present in a DNA double helix fragment consisting of the following sequence in one strand: ATTGCGGTCAA single strand of DNA, 24 nucleotides long, with the sequence 5'-TTTCCCgggAAAgggTTTAAAggg-3' is in a test tube. (Note that G's are shown in lowercase, so that your eye can better distinguish them from C's) Other than the appropriate buffer solution, what else needs to go in the test tube to so that we end up with a piece of double stranded DNA, 24 base pairs long, with the above sequence comprising one of the two strands?TRUE OR FALSE 1. Nitrogenous bases cannot undergo electrophilic aromatic substitution.2. Cytosine forms three hydrogen bonds with guanine while Adenine forms two hydrogen bonds with Thymine in themessenger RNA.3. The glycosidic bond in nucleotides is stable in dilute ammonium hydroxide solution and dilute Sodium bicarbonatesolution.4. In gel electrophoresis, a DNA is expected to migrate towards the cathode.5. Tautomerism is a phenomenon observed in both purine and pyrimidine bases.
- Given the following mismatch (highlighted in red), which base will be replaced after mismatch repair occurs? Mutant sequence (CH3 = methyl): CH3 I 5'-GATCTCAGGC-3' 3;-CTAGAGGCCG-5' a. G b. A1. a) If one DNA segment has the following base composition, 5'-CAGTTAGTCA-3', which of the following sequences is complementary? op 1: 3'-CAGTTAGTCA-5' op 2: 3'-TGACTAACTG-5' op 3: 5'-TGACTAACTG-3' op 4: 3'-TGACTAACTG-5' b) What is the nucleotide sequence of the DNA strand that is complementary to 5'-ATCGCAACTGTCACTA-3' op 1: 5'-TAGCGTTGACAGTGATA-3' op 2: 5'-TAGTGACAGTTGCGAT-3' op 3: 5'-ATCACTGTCAACGCTA-3' op 4: 5'-UAGUGACAGUUGCGAU-3'The base analog 5-bromouracil (5BU), which sterically resembles thymine, more readily undergoes tautomerization from its keto form to its enol form than does thymine. 5BU can be incorporated into newly synthesized DNA when it pairs with adenine on the template strand. However, the enol form of 5BU pairs with guanine rather than adenine. (a) Draw the 5BU · G base pair. (b) What type of mutation results?
- 22-71 Indicate whether each of the following statementsinvolving differences between DNA and RNA moleculesis true or false.a. Base pairing occurs in DNA but not in RNA.b. Both DNA and RNA are double-stranded molecules.c. RNA molecules are much larger than DNAmolecules.d. The base T in DNA is replaced by the base A in RNAHow often, on average, will the endonuclease AluI, which cleaves the sequence 5’ AGCT 3’, cut normal DNA (assume equal amounts of each base)? (In other words, what will the average fragment size be after cutting?) Group of answer choices 256 bases 12 bases 40 bases 16 bases none of theseA duplex DNA molecule contains a random sequence of the four nucleotides with equal proportions of each. What is the average spacing between consecutive occurrences of the sequence 5'-ATGC-3'? Between consecutive occurrences of the sequence 5'-TACGGC-3'?