2017_Bacteria_Viruses_MCQ_QP+MS

2017 Bacteria and Viruses MCQ 2017 / H2 / ACJC PRELIM / P1 Q61The diagram shows an electron micrograph of a bacterial cell. XWZYWhich of the following correctly identifies the functions of structures W, X, Y and Z?WXYZAMaintains shape of bacterial cellProtects bacterial cell against desiccationContains antibiotic resistance genes which may be beneficial to the bacterial cellServes as the site of protein synthesisBControls the passage of substances into and out of the cellMaintains shape of bacterial cellContains genetic information which is essential to the survival of bacterial cellServes as the site of translation of mRNACControls the passage of substances into and out of the cellMaintains shape of bacterial cellContains antibiotic resistance genes which may be beneficial to the bacterial cellProtects bacterial cell against desiccationDProtects bacterial Protects bacterial Contains genetic Maintains shape

cell against desiccationcell from the action of phagocytesinformation which is essential to the survival of bacterial cellof bacterial cell

2017 / H2 / ACJC PRELIM / P1 Q72The diagram below shows the enterobacteria phage P22 which is a bacteriophage that infects the bacterium Salmonella typhimurium. The genetic material and replication cycle of P22 are similar to the lambda phage. Which of the following statements can be inferred?AIt is a virulent phage which contains double-stranded RNA and undergoes the lytic cycle.BIt has a spherical envelope that is obtained when the phage buds from the host cell.CIt forms a prophage, which is replicated and passed to the daughter bacterial cells during cell division.DIt has tail fibres which allow the phage to attach to various species of host bacteria.2017 / H2 / ACJC PRELIM / P1 Q93Many of the most effective antibiotics used in modern medicine are compounds made by fungi that inhibit bacterial protein synthesis. Among the most commonly used drugs are Chloramphenicol, Cycloheximide and Rifampicin. The results of the exposure to eukaryotic and prokaryotic cells to the above three drugs are shown.Anti-microbial drugChloramphenicolCycloheximideRifampicinEukaryotic Animal CellTruncated polypeptides were found in mitochondria onlyTruncated polypeptides were found in cytosolNo protein synthesizedProkaryotic CellTruncated polypeptides were found in the cytosolTruncated polypeptides were found in the cytosolNo protein synthesizedWhich of the following shows the correct combination of the possible drug mechanisms of the above drugs?

ChloramphenicolCycloheximideRifampicinAInhibits the peptidyl transferase activity of the 70S ribosomesInhibits elongation by binding the E site of the ribosome hence preventing the release of tRNAInhibits the transcription of DNA by blocking the movement of RNA polymerase on DNABInhibits the peptidyl transferase activity of the 80S ribosomesInhibits elongation by binding the E site of the ribosome hence preventing the release of tRNAInhibits the transcription of DNA by blocking the