QUESTION 22When double-stranded DNA is heated at neutral pH, which change does not occur?The N-glycosidic bond between the base and the pentose breaksThe helical structure unwindsThe absorption of ultraviolet (260 nm) light increasesThe viscosity of the solution decreasesThe hydrogen bonds between A and T break

DNA is the genetic hereditary material found in almost all organisms. All cells in our body contain…

Answered: When double-stranded DNA is heated at…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Question 17 What is the nucleotide sequence of the DNA strand that is complementary to 5-АTCGCAACTGTCAСТА-3 A 5-UAGUGACAGUUGCGAU-3' B 5'-TAGCGTTGACAGTGATA-3" с) 5-АТCАСTGTCААCGCTA-3 D 5'-TAGTGACAGTTGCGAT-3'
Question 17 What is the nucleotide sequence of the DNA strand that is complementary to 5'-ATCGCAACTGTCACTA-3 A 5'-UAGUGACAGUUGCGAU-3' B 5-TAGCGTTGACAGTGATA-3 5'-ATCACTGTCAACGCTA-3 D 5'-TAGTGACAGTTGCGAT-3'
Question 25 If one DNA segment has the following base composition, 5-CAGTTAGTCA-3', which of the following sequences is complementary? A 3'-CAGTTAGTCA-5' 3'-TGACTAACTG-5' 3-TGACTAAСTG-5 D 5-TGACTAACTG-3'
Question 15 Three of these are related to a nucleotide. Select the exceptions. R group pentose O phospahte group O nucleoside n amino group
QUESTION 26 In a double-stranded DNA molecule, how are the sequences of each strand related to each other? A The sequences are identical. B The sequences are identical except that one strand has a U where the other strand has a T. C The sequences are the reverse compliment of each other and use the nucleotides, A, G, U, and C only. D The sequences are the reverse complement of each other.
Question 7 About the helical structure of DNA: |A The DNA is always in the form of a type A closed helix (left rotation), whatever its composition in nucleotides. B DNA is rich in positive electrical charges at physiological (pH 7.4). C The helix is established between two com- plementary regions of the same strand. D The helix is formed by an esterification re- action between two strands. E All the above statements are wrong
Question 16 The Watson and Crick model of DNA structure shows the following EXCEPT A the turn of the DNA helix results in spatial grooves for binding with regulatory proteins B covalent bonding between bases to form the primary structure C Along the interior of the double helix are van der Waals forces and hydrophobic interactions stabilizing the molecule D the base pairs are nearly perfectly planar and are perpendicular to the axis of the molecule
Question 59 FLAG QUESTION Answers A-E When comparing the mode of action of benzopyrene with ethidium bromide, one sees that both have a flat and hydrophobic structure. Both will enter the double helix of DNA and will be retained, at least in part, by the hydrophobic stacking of the bases. But the most important difference is: A Only Ethidium will color the DNA B Benzopyrene forms a covalent bond with DNA C Only Benzopyrene will form tumors D Ethidium makes DNA resist UV light) E There is a specific enzyme that removes Ethidium from DNA ● 0 O *** 0
QUESTION 11 If the DNA gene is TAC GGT TTA CAG, which amino acids will be put together? O A. methionine-proline-aspargine-valine O B. tyrosine-glycine-leucine-glutamine OC valine-serine-threonine-lysine O D. phenylalanine-cysteine-tryptophan-alanine
QUESTION 21 Very carefully analyze each nucleotide structures (base and sugars) and identify the structure(s) that is (are) expected to be the part of DNA only. NH NH OH B A O only A O A and C O c and D O only C O A and B
Question 8 Electrophoresis in agarose gel |A The DNA will migrate to the negative elec- trode due to the presence of phosphate groups. B For a given DNA molecule, the higher the percentage in G/C pairs, the less the DNA will migrate. C The migration speed depends on the agarose percentage. D] The migration of an undigested, circular plasmid DNA will depend solely on its number of base pairs. E If the migration buffer is at physiological pH (7.4), the DNA will not migrate.
Question 10 All of the following are characteristics of Transfer RNA except: O a. Only one loop has the codon that is complementary to the anticodon sequence on mRNA Not yet answered O b. Amino acids are attached at the 3' end Marked out of O c. Each tRNA is used repeatedly during the translation process 1.00 P Flag O d. It's a single strand made of 80 nucleotides, has four regions of base-pairing, and 3 loops question Ое. Anticodon of some tRNAs recognize more than one codon by the wobble base pairing

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