Chem 210 Exam 6 Actual Study Questions with Accurate Answers

Chem 210 Exam 6 Actual Study Questions with Accurate Answers 1. identify the complementary bases from the following A. adenine-cytosine B. adenine-thymine C. guanine-thymine D. guanine-adenine E. cytosine-uracil - ANSWER B. adenine-thymine 2. the conclusion that G and C are present in DNA in equimolar amounts is credited to ______ A. james watson B. francis crick C. erwin chargaff D. both A and B E. none of the above - ANSWER C. erwin chargaff 3. in RNA, guanine always pairs with ______ A. thymine B. guanine C. cytosine D. uracil E. both A and B - ANSWER C. cytosine 4. DNA is built from which of the following? A. nucleosides B. genes C. purines D. nucleotide E. codons - ANSWER D. nucleotide 5. the Z-form helix of DNA is stabilized mainly by_____ A. ionic bonds B. covalent bonds C. hydrogen bonds D. ion-dipole bonds E. hydrogen covalent bonds - ANSWER C. hydrogen bonds 6. which of the following pentose sugars is a constituent of mRNA? A. ribose B. xylose C. ribitol D. 2-deoxyribose E. arabinose - ANSWER A. ribose 7. Purines have ____ ring(s), (each) containing _____ nitrogen(s), whereas pyrimidines have _____ ring(s), (each) containing _____ nitrogens. A. 1; 1; 1; 1 B. 1; 2; 1; 2 C. 2; 1; 1; 2 D. 2; 2; 1; 1 E. 2; 2; 1; 2 - ANSWER E. 2; 2; 1; 2 8. how many hydrogen bonds are made between T and its complementary nucleotide? A. 2 B. 3 C. 4 D. 5 E. 6 - ANSWER A. 2 9. the base sequence along one strand of DNA of 5'-GCATGAGCC-3'. what is the sequence of the complementary strand of DNA? A. 5'-CTAGTCCGC-3' B. 3'-CGTACTCGG-5' C. 3'-CTAGTCCGC-5' D. 3'-CAGTCAGCT-5' E. 5'-CTGACTACG-3' - ANSWER B. 3'-CGTACTCGG-5' of the following types of RNA functions as the molecule to bring amino acids to ribosomes? A. mRNA B. gRNA C. rRNA D. snRNA E. tRNA - ANSWER E. tRNA of the following is a set of three sequential nucleotides that encodes for a particular amino acid? A. codon B. anticodon C. allele D. gene E. chromosome - ANSWER A. codon 12.a type of DNA that has a right-handed helix is the A. A-form B. X-form C. C-form D. L-form E. Z-form - ANSWER A. A-form of the following is a second messenger in cells? A. FAD B. cAMP C. AMP D. dATP E. UTP - ANSWER B. cAMP