If 30% of the bases in a DNA sequence are G, what percentage of bases would you expect to be A? 20% 30% 35% None of the above
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If 30% of the bases in a DNA sequence are G, what percentage of bases would you expect to be A?
- 20%
- 30%
- 35%
- None of the above
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- If thymine makes up 15% of the nitrogenous bases in a specific DNA molecule, what percent of the bases are cytosine? O 15% O 30% 35% O 42.5% O 70% 85%A double-stranded DNA molecule (B-DNA) is 100,000 base pairs long. How many complete turns are there in the molecule? * None of the above 10000.0 9090.0 9523.8 O 8333.3The ratio of (A+T) to (G+C) in a particular DNA is 1.0. Is this sufficient data to determine whether the DNA is double-stranded or single-stranded please explain why or why not.
- Permutation is the ordered arrangement of m number items out of a list of n items. For instance, the DNA strand with sequence of 3 bases: G-A-C IS different w ith A-G-C, C-A-G, G-C-A, A-C-G, and C-G-A. From this, we have: P-3) 3! 3x2x1 Therefore, there are 6 dıfferent sequences of DNA strands that can be formed out of 3 given bases. In general, we have this formula for permutation: (n-m)! Count the number of ways in which: Guanıne, Adenine, Cytosine, Thymıne, Cytosine, and Guanıne (6 bases) be sequenced in one DNA strand?In a segment of DNA consisting of 1000 nitrogen bases, 28% of which are thymine, how many bases are adenine, guanine, and cytosine?Type the matching bases in each DNA sequence. G A T A G C T A G G
- If DNA analysis of a gene shows it has 20% adenine (A), what percent of the other bases does it have? Cytosine (C): Guanine (G): Thymine (T): Uracil (U): 6. Now for a sense of size. Rank the following from smallest (1) to largest (6): gene, cell, chromosome, atom, nucleus, nucleotideDNA structure depends on base pairing of its four nucleotides, A, C, T, and G. Nucleotide A pairs with T, and nucleotide C pairs with G. This forms a four-letter DNA “alphabet." Because DNA codes for amino acids in sets of three nucleotides, there are 4 cubed (4'), or 64, possible combinations, coding for 20 different amino acids. What is the best explanation for why there is no selective advantage for DNA to have five nucleotides (e.g., A, C, T, G, and E) with C pairing with either G or functionally equivalent E? It would be impossible to form the DNA molecule, because it must have an equal number of Cs and Gs. Because G and E have the same role, there would still be four functional letters of the alphabet. Replication would be inaccurate because sometimes C would bond with G and sometimes C would bond with E. There would be a five-letter alphabet with 125 combinations, which is too numerous. It is impossible because there are not five known nucleotides in the cell.The 260/280 ratio of pure DNA is between 1.8- 35 2.0. The absorbance of DNA at different 30 wavelengths is shown to the right. Based on the graph, why is a 260/280 ratio of DNA between 1.8-2.0 considered pure?n 25 20 15 10 220 240 260 280 300 320 340 Wavelength (nm) Absorbance
- If the GC content of a DNA molecule is 48%, what are the percentages of the 4 bases A, T, C, and G- in this molecule? O A= 24%, C = 26%, G = 26%, T = 24% O A= 24%, C = 24%, G = 26%, T = 26% O A = 26%, C = 24%, G = 24%, T = 26% O A= 52%, C = 48%, G = 48%, T = 52% O A= 52%, C = 48%, G = 52%, T = 48%A circular double-stranded DNA molecule contains 4200 base pairs. In solution, the molecule is in a B-form helix, with about 10.5 base pairs per turn. The DNA circle has 12 superhelical turns. What is its superhelix density σ ?Which of the following pieces of DNA is going to be easier to separate into single stranded molecules using heat (ie, have a lower melting point), which breaks hydrogen bonds? Why? 1. 5’ ATTTTCCGTAAT 3’ 3’ TAAAAGGCATTA 5’ 2. 5’ ACGGTTTACCGG 3’ 3’ TGCCAAATGGCC 5’ A) 2; it has more C-G pairs which are connected by three hydrogen bonds instead of two, so they are easier to break. B) 1; it has more A-T pairs which are connected by one hydrogen bond instead of two, so they are easier to break. C) 2; it has more C-G pairs which are connected by two hydrogen bonds instead of three, so they are easier to break. D)1; it has more A-T pairs which are connected by two hydrogen bonds instead of three, so they are easier to break.