17. RNA a. is never double stranded. b. may function as an enzyme. c. contains a
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17. RNA a. is never double stranded. b. may function as an enzyme. c. contains a different hexose sugar than DNA. d. unlike DNA, is not a polymer. e, has the same bases as DNA. 18. The a-hellx is characterized by orlentation of the molecular axis. a. H bonds parallel to b. H bonds perpendicular to c. ionic bonds parallel to d. ionic bonds perpendicular to e. peptide bonds perpendicular to 19. What are the bulding blocks of a phosphoglyceride, epecifically phosphatidic aclar a. glycerol + 2 phosphate groups + I fatty acid b. glycerol + I phosphate group + 2 fatty acids c. glycerol + I phosphate group d. glycerol +3 fatty acids e. glycerol+ I phosphate group+ 3 fatty acids such as transcription factors often can read the sequence of 20. DNA blnding proteins nucleotides along the DNA without having to separate the chains. How do they d o this? ps reflect the DNA sequence. a. The conformations of the phosphate grou b. The conformations of the deoxyribose sugars reflect the DNA sequence. c. The conformations of the ribose sugars reflect the DNA sequence. d. The DNA binding proteins often contain domains that fit into the DNA grooves. e. Both a and d are correct answers 21. The three-dimensional shape of an RNA molecule is determined mostly by a. hydrophobic interactions b. van der Waals forces. c. ionic bonds d. formation of complementary base pair regions. e. hydroponic interactions.Explanation / Answer
17. b. RNA may function as an enzyme. Ribozymes are RNA molecules which function as enzymes and are capable of catalyzing chemical reactions.
All other options are incorrect as i. RNA can be double stranded in certain viruses and microorganisms. ii. Both DNA and RNA are made of pentose sugars. iii. Both RNA and DNA are made of polymers. iv. DNA has adenine, guanine, cytosine and thymine whereas RNA has uracil in place of thymine.
18.a. The alpha helix is characterised by orientation of H bonds parallel to molecular axis.
19. b.Building blocks of phosphoglyceride - glycerol + 1 phosphate group + 2 fatty acids.
20. d.The DNA binding proteins often contain domain that fit into the DNA groove. They use DNA binding domains to bind to specific sequences in the genome to initiate many important biological functions.
21.d.The three dimensional structure of RNA is determined by formation of complementary base pair regions.
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