Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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Which of the following is the correct way that heterocyclic bases are paired between two polypeptide chains of DNA?
a. Pyrimidines-Pyrimidines
b. Purine-Pyrimidine
c. Purines-Purine
d. Sugar-Phosphate
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- The most important force for stability of the DNA double helix is: a. Disulfide bond b. Hydrophilic interactions c. electrostatic interaction d. Base stackingarrow_forwardWhich of the following is NOT true of deoxyribonucleic acid (DNA)? A. None of the other four answers (all are true of DNA) B. Each DNA nucleotide contains the sugar ribose, phosphate, and one of the following nitrogenous bases: adenine, uracil, guanine, or cytosine C. Stores genetic information that can be expressed within a bacterial cell, transferred “vertically” to offspring cells, or “horizontally” to other recipient cells D. Found as a circular molecule in bacteria, either as chromosomes or plasmids E. Serves as a template for the transcription of mRNAarrow_forwardN C N HC C GH CH N H Which base normally pairs with this structure: a. Thymine b. Adenine c. Cytosine d. Guaninearrow_forward
- Which of the following statements about nucleic acids is not correct? Select one: A. In DNA the distance between the strands of the double helix is relatively constant. B. The growing DNA polymer is synthesized in the 5' to 3' direction. C. The enzymes that catalyze DNA synthesis are known as DNA polymerases. D. RNA strands are synthesized in the 3' to 5' direction. E. Unlike DNA, RNA is easily cleaved because the 2'-OH group of the ribose is a nucleophile that catalyzes hydrolysis of the strand.arrow_forwardIf C +T/A + G equals 0.5 in one strand, what is the ratio of these bases in the complementary strand? A. 0.25 B. 0.5 C. 1 D. 2 E. 4arrow_forwardWhich of the following relations will be found in the percentages of bases of a double-stranded DNA molecule? a. A+T-G+C b. A+G=T+C A+C-G+T c. d. (A +T)/ (C+G) = 1.0 e. (A+G)/ (C+T)= 1.0 f. (A/C)=(G/T) g. (A/G)=(T/C) h. (A/T)=(G/C)arrow_forward
- In Watson and Crick's model of DNA structure, the two strands of the DNA double helix are joined through a. Ionic bonds b. Hydrophobic interactions c. Covalent bonds d. Disulfide bonds e. Hydrogen bondsarrow_forwardCytosine makes up 42% of the nucleotides in a sample of DNA from an organism. The composition of the remaining bases is % adenine, % guanine, and % thymine.arrow_forwardFor the following sequence of amino acids, serine-valine-lysine-leucine, which of the choices below is the correct order for the nucleotide base sequence in DNA? Group of answer choices a. UGUGCAAAGUUA b. AGACAATTCAAT c. TCTCGTTTGTTA d. TGTGCTTTCTTAarrow_forward
- Describe the characteristics of base pairings between nucleotide bases.arrow_forwardWhich of the following is/are true about the two DNA strands that form a helix? (check all that apply) Select one or more: a.The 2 strands are antiparallel and complementary to each other b.The 2 strands are linked to each other by phosphodiester bonds c.The phosphate groups of nucleotides impart a negative charge to nucleic acidsarrow_forwardWhich of the following correctly describes a structural feature of DNA or RNA? a. RNA may fold into complex three-dimensional structures necessary for its activity b. RNA & DNA are both usually double stranded c. DNA tends to fold into complex three-dimensional structures required for its activity d. DNA contains a pentose sugar with a hydroxyl group in the 2' positionarrow_forward
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