5. Analysis of a DNA was found to contain 30% adenine and 20% thymine. This DNA
ID: 183082 • Letter: 5
Question
5. Analysis of a DNA was found to contain 30% adenine and 20% thymine. This DNA molecule is most like to be a: A) single stranded RNA B) double stranded RNA C) single stranded DNA D) double stranded DNA E) None of the above 6. Histone proteins bind to DNA due to the following property: A) Positive charge. B) Negative charge. C) Neutral charge. D) Hydrophobic amino acids. E) Hydrophilic amino acids. 7, Cytosine makes up 18% of the nucleotides in a sample of DNA from an organism. Approximately, what percentage of the nucleotides in this sample will be thymine? A) 12 B) 24 C) 31 D) 38 E) It cannot be determined from the information provided. 8. What kind of chemical bond is found between nucleotides of a polynucleotide strand? A) hydrogen B) ionic C) covalent D) sulfhydryl E) phosphodiester 9. It became apparent to Watson and Crick after completion of their model that the DNA molecule could carry a vast amount of hereditary information in its A) sequence of bases B) phosphate-sugar backbones C) complementary pairing of bases. D) side groups of nitrogenous bases. E) different five-carbon sugars. 10. The strands that make up DNA are anti-parallel. This means that A) the twisting nature of DNA creates nonparallel strands. B) the 5' to 3' direction of one strand runs counter to the 5' to 3' direction of the other strand. C) base pairings create unequal spacing between the two DNA strands. D) one strand is positively charged and the other is negatively charged.Explanation / Answer
5. The answer is d. Single stranded DNA.
Explaination:
According to Chargaffs rule, the concentration of adenine and thymine is always equal. But this rule is applicable to only double stranded DNA. If the concentration of adenine and thymine is not equal, it means that it is a single stranded DNA.
6. The answer is A. Positive charge.
Explaination:
Histone proteins are rich in basic amino acids and hence acquire a positive charge to accumulate at the point of interaction with negatively charged phosphate group in DNA.
7. The nearest answer is C. 31.
Exact answer is 32.
Explaination:
[A]+[T]+[C]+[G]= 100
According to Chargaff's rule,
If cytosine is 18%, then guanine is also 18%.
18+18=36
Therefore, 100-36= 64/2 = 32.
Thus, double stranded DNA contains 32% thymine and 32% adenine.
8. The answer is E. Phosphodiester bond.
Explaination:
A single polynucleotide strand is a phosphate pentose polymer in which nucleotides are linked by the phosphodiester bonds.
9. The answer is A. Sequence of bases.
Explaination:
The genetic or hereditary information is carried in the linear sequence of nucleotides in DNA.
10. The answer is B.
Explaination:
Both the strands of DNA runs opposite to one another so they are antiparallel to each other.
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