Microbiology Chapter 8 Exam Questions with 100% Correct Answers | Verified | Updated

Microbiology Chapter 8 Exam Questions with 100% Correct Answers | Verified | Updated A gene is best defined as A sequence of nucleotides in DNA that codes for a functional product. A sequence of nucleotides in RNA that codes for a functional product. A transcribed unit of DNA. Three nucleotides that code for an amino acid. A segment of DNA. - answerA sequence of nucleotides in DNA that codes for a functional product. Which of the following pairs is mismatched? RNA polymerase - makes a molecule of RNA from an RNA template DNA polymerase - makes a molecule of DNA from a DNA template DNA ligase - joins segments of DNA Transposase - insertion of DNA segments into DNA DNA gyrase - coils and twists DNA - answerRNA polymerase - makes a molecule of RNA from an RNA template Which of the following statements is false? The leading strand of DNA is made continuously. The lagging strand of DNA is started by an RNA primer. DNA polymerase joins nucleotides in one direction only. Multiple replication forks are possible on a bacterial chromosome. DNA replication proceeds in one direction around the bacterial chromosome. - answerDNA replication proceeds in one direction around the bacterial chromosome. DNA is constructed of Two strands of identical nucleotides with hydrogen bonds between them. Two strands of nucleotides running antiparallel. A single strand of nucleotides with internal hydrogen bonding. Nucleotides bonded A-C and G-T. None of the above. - answerTwo strands of nucleotides running antiparallel. Which of the following is NOT a product of transcription? A new strand of DNA rRNA tRNA mRNA None of the above - answerA new strand of DNA Which of the following statements about bacteriocins is false? They cause food-poisoning symptoms. They can be used to identify certain bacteria. Bacteriocins kill baceria. The genes coding for them are on plasmids. Nisin is a bacteriocin used as a food preservative. - answerThey cause food-poisoning symptoms. In the figure, which colonies are streptomycin-resistant and leucine-requiring? 1, 2, 3, and 9 4, 6, and 8 3 and 9 5 and 6 4 and 8 - answer4 and 8 Culture 1: F+, leucine+, histidine+ Culture 2: F-, leucine-, histidine- In the table above, what will be the result of conjugation between cultures 1 and 2? 1 will become F-, leu+, his+; 2 will become F+, leu-, his- 1 will remain the same; 2 will become F+, leucine-, histidine- 1 will become F-, leu-, his-; 2 will remain the same 1 will remain the same; 2 will become F+, leu+, his+ 1 will remain the same; 2 will become F+ and recombination may occur - answer1 will remain the same; 2 will become F+, leucine-, histidine- Culture 1: F+, leucine+, histidine+ Culture 2: F-, leucine-, histidine-