BCTB Chapter 8 - Schrader Questions And Answers Graded A+

A major component of RNA but not of DNA is: A) adenine. B) cytosine. C) guanine. D) thymine. E) uracil. - E) uracil. A next-generation method of DNA sequencing, 454 sequencing, uses pyrosequencing in which the addition of nucleotides is detected by a: A) radioactive signal. B) fluorescently labeled dNTP. C) pulse from a laser. D) flash of light. E) nano-ruler's physical movement of 4.54 nm detected by laser. - D) flash of light. A pyrimidine is joined covalently to the pentose sugar through the: A) N-1 of the base to the 1 carbon of the pentose. B) N-9 of the base to the 1 carbon of the pentose. C) N-1 of the base to the 5 carbon of the pentose. D) N-9 of the base to the 5 carbon of the pentose. E) None of the answers is correct. - A) N-1 of the base to the 1 carbon of the pentose. A tetraplex of DNA is MOST likely to form with which residue? A) Adenosine B) Thymidine C) Guanosine D) CytidineE) A tetraplex is equally likely with all bases. - C) Guanosine B-form DNA in vivo is a _____-handed helix, _____ Å in diameter, with a rise of _____ Å per base pair. A) left; 20; 3.9 B) right; 18; 3.4 C) right; 18; 3.6 D) right; 20; 3.4 E) right; 23; 2.6 - D) right; 20; 3.4 Chargaff's rules state that in typical DNA: A) A = G. B) A = C. C) A = U. D) A + T = G + C. E) A + G = T + C. - E) A + G = T + C. Compounds that generate nitrous acid (such as nitrites, nitrates, and nitrosamines) change DNA molecules by: A) breakage of phosphodiester bonds. B) deamination of bases. C) depurination. D) formation of thymine dimers. E) transformation of A T. - B) deamination of bases. DNA is _____ chemically stable than RNA due to the _____ on _____. A) more; 2-hydroxyl groups; RNA B) more; 2-hydroxyl groups; DNA C) more; 3-hydroxyl groups; RNA D) less; 2-hydroxyl groups; RNAE) less; 2-hydroxyl groups; DNA - A) more; 2-hydroxyl groups; RNA Double stranded regions of RNA typically take on a(n): A) A-form left-handed helix. B) A-form right-handed helix. C) B-form left-handed helix. D) B-form right-handed helix. E) Z-form left-handed helix. - B) A-form right-handed helix.