Biochemistry ACS Exam Questions with All Correct Answers

Biochemistry ACS Exam Questions with All Correct Answers What are nucleotides? - ANSWER the monomer unit for nucleic acids and are composed of nitrogenous base, 5-carbon sugar & phosphate group Nucleic Acids are biopolymers categorized as: - ANSWER DNA RNA DNA - ANSWER carrier of genetic information RNA - ANSWER intermediate in gene expression (not all) can form secondary structure - tRNA 4 types of RNA - ANSWER tRNA rRNA siRNA miRNA tRNA - ANSWER transfer RNA, holds amino acids used in protein synthesis **wobble position rRNA - ANSWER ribosomal RNA, part of ribosome siRNA - ANSWER small interfering RNA short term silence coding genes targets mRNA for degradation miRNA - ANSWER micro RNA silencing & plot transcriptional regulation of gene expression ribozyme - ANSWER associated with miRNA catalyze reactions The 2 types of nitrogenous bases - ANSWER Purines Pyrimidines Purines - ANSWER 2 rings - pyrimidine & imidazole Adenine & Guanine = derivatives Pyrimidines - ANSWER 1 ring cytosine, thymine, uracil = derivatives B DNA - ANSWER 0.34 n between bp 3.4 nm per turn 10 bp per turn right handed helix bases stacked parallel & facing each other --> high H bonding A DNA - ANSWER Cylindrical CORE 11 bp per turn DNA is dehydrated Tightly wound right handed helix