Name Class Chapter 9 Qui Date Inudicate the answer choice that best completes th
ID: 99218 • Letter: N
Question
Name Class Chapter 9 Qui Date Inudicate the answer choice that best completes the statement or answers the question -1 , which of the following groups is not food in noclosides? a. Phosphates b. Purines e. Pyrimidines d. Sugars e. All of these are found in nucleosides -2. Which of the following nucleobases is a purine? a adenine b. cytosine e. thymine d. uracil 3, which contains a phosphanhy dride bond? a. DNA b. RNA C. ATP d. AMP e. None of these 4, which ofthe following is not true? a. The amount of UV absorbance increases, but the wavelength does not change as DNA nears its melting point b. Once DNA is denatured, it cannot renature c. The melting temperature partially depends on the GC content d. The nature of the solvent the DNA is in can affect the melting temperature -5. The Tm for rnelting the duble helix is: a. The temperature at which the helix starts to open. b. The midpoint of the range over which the helix denatures c. The temperature at which the helix is completely open. d. The energy needed to melt the DNA e. None of these is correct. 6, where can drugs or polypeptides bind to DNA? a. The minor groove only. b. The major groove only c. Either the minor or major groove. d. Neither the minor or majior groove Page 1Explanation / Answer
Answers:
1) Phosphates group is not found in nucleosides.
2) adenine nucleobases is purine.
3) ATP contains a phosphoanhydride bond.
4) once dna is denatured it cannot be renatured is not true because after denaturation the protein can be able to reture to original state when the denaturation stress comes down or removed.
5) The Tm for melting double helix is the midpoint of the range over which the helix denatures.
6)The polypeptide bind to the DNA to either minor or the major groove.
7) Topoisomerases are associated with the supercoiling of the DNA.
8) Z-form of DNA tends to occur in alternating purine pyrimidine sequence.
9) True
10) The strand in the double helix have their 3'-5' direction opposed i.e they are antiparallel.
11) The three dimentional structure of nucleic acid can include all except circular molecule.
12) Base pair with propeller twist have stronger hydrogen bond than base pair without a propeller twist.
13) The A and B forms of DNA are both right handed helix
14)Quaternary structure refers to the non covalent interaction between polymeric unit such as two or more monomer protein units that non covalently interact. Self assembly of the subunits in tobacco mosaic virus, interaction of DNA with proteins, RNA and protein association with ribosome scenario for nucleic acid closely resembles quaternary structure.
15) Three dimentional structure of transfer RNA has been determined by X-ray crystallography.
16) It bonds to aminoacid in the course of protein synthesis.
17) In analytical ultracentrifugation the sedimentation coefficient which is expressed in svedburg units characterizes the sedimentation particle on the basis of both shape and size.
18)Transfer RNA molecule are characterize by all the following except They are one of the largest of the RNA.
19) The most recent discovaries in RNA are miRNA and siRNA.
20)RNA is hydrolised in basic solution but DNA not because DNA has 2-deoxyribose but RNA doesn't.
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