BIL150 Mallery Exam 4 Questions and Answers 100% Pass

BIL150 Mallery Exam 4 Questions and Answers 100% Pass The two polynucleotide chains in DNA are held together primarily by H bonds between A and U as well as between G and T? a. True b. False - ANSWER -B (DNA does not have Uracil, it has Cytosine) If there is 12% of A in a DNA molecule, then the % of G must be? a. 12% b. 30% c. 368 d. 76% e. none of these are correct - ANSWER -E (A=T and C=G, A+G/T+C=1) 2 | P a g e Created by Grace Amelia © 2025, All Rights Reserved. The catalytic molecule responsible for making a peptide bond during translation (protein synthesis) in cells is? a. amino synthase b. ribozyme c. release factor d. plasmid e. none of these - ANSWER -B Which of the following biotechnology procedures would one use to specifically edit a known sequence of DNA in a genome? a. polymerase chain reaction b. restriction endonuclease c. CRISPR-Cas9 d. reverse transcriptase e. none of these is correct - ANSWER -C The genetic code? a. is redundant b. is universal 3 | P a g e Created by Grace Amelia © 2025, All Rights Reserved. c. exhibits 'wobble' d. is a triplet codon e. all of the above - ANSWER -E The number of human protein genes is closest to which of the following numbers? a. 100,000 b. 3,000,000 c. 20,687 d. 40% of all human DNA e. none of these - ANSWER -C Which of the following processes is NOT part of the Central Dogma? a. transcription b. translation c. synapsis d. replication e. all of these - ANSWER -C (Central Dogma: Replication, Transcription, Translation) The enzyme that opens/untwists DNA to allow for it replication by DNA polymerase is? 4 | P a g e Created by Grace Amelia © 2025, All Rights Reserved. a. topisomerase b. helicase c. primase d. DNA ligase e. binding proteins - ANSWER -B (Topoisomerase = removes supercoils, Primase = RNA polymerase, DNA ligase = seals 3' open holes, Binding proteins = stabilize replication fork) Which of the following enzymes of DNA replication is actually an RNA polymerase? a. topisomerase b. helicase c. primase d. DNA ligase e. DNA polymerase II - ANSWER -C (Primase = RNA polymerase, makes RNA primer terminus) Which of the following product molecules of transcriptions is cut up to produce mRNA? 5 | P a g e Created by Grace Amelia © 2025, All Rights Reserved. a. ribsomal RNA b. the primary transcript c. transfer RNA d. micro RNA e. none of these - ANSWER -B (Primary transcript = mRNA, introns splice out to make 3 pieces) (Hershey-Chase experiment, labeled genetic molecules in bacteriophages) What molecules were labeled with 32P?