🦠 Microbiology Solved MCQs with Answers

Practice 1927 approved 🦠 Microbiology questions with verified answers from the 🧬 Medical Science subject for Pakistan exams.

1927 solved MCQs

The mutation which will not affect the length of a protein is,Answer: Missense mutation Changes in which of the following characterizes mutations?Answer: Both (a) and (b) Which of the following(s) is/are steps in excision repair mechanisms?Answer: All of these The whole-genome shotgun sequencing approach depends primarily onAnswer: Rapidly sequencing thousands of small randomly cloned fragments What was the first eukaryotic chromosome to be sequenced?Answer: Yeast chromosome III Which of the following mutations arise without exposure to external agents?Answer: Spontaneous mutations Due to which of the following DNA repair mechanisms, one is able to distinguish newly synthesized DNA strands from older one?Answer: Old strands are methylated while new strands are not Which of the following bacterial genome was sequenced first?Answer: H. influenzae A nonsense mutation may result intoAnswer: A premature termination of the synthesis of a polypeptide Which of the following mutation affects only a single nucleotide?Answer: Point mutation When mutations involve vital functions so that the mutants are nonviable, it is aAnswer: Lethal mutation A mutagen is defined asAnswer: A chemical or physical agent that induces mutations The DNA sequences of rRNA genes can be used toAnswer: Obtain a tentative identification of a new microorganism A nonsense mutation introduced into the DNA sequence of a gene mayAnswer: Shorten the length of the protein encoded by the gene Which of these mechanisms for thymine dimers repair lead to mutations?Answer: SOS repair Frame shift mutation may occur as a result ofAnswer: None of these Thymine dimers are directly repaired with the help of visible light by process known asAnswer: Photoreactivation The promoter on an expression vector used to overproduce proteins in bacteria isAnswer: A bacterial promoter Differentiation of four different bases in automated sequencing systems is that each base hasAnswer: Distinctive fluorescent tag Which of the following medium are used to differentiate the colonies of Vibrio cholerae and V parahaemolyticus?Answer: Thiosulphate-citrate-bile-sucrose Which of the followings can be used to differentiate between classical and El Tor biotypes of Vibrio cholerae?Answer: All of these Which of the following biotypes of Vibrio cholerae are prevalent in India?Answer: EI Tor Which of the following bacteria is associated with food poisoning due to consumption of sea fish?Answer: Vibrio parahaemolyticus Which of the following conditions can be caused by Plesiomonas?Answer: All of these Acute diarrhoeal disease resembling cholera can be caused due toAnswer: Aeromonas hydrophila The transport medium for Vibrio cholerae can beAnswer: Venkatraman-Ramakrishnan medium Which of the following does not cause wound infection following exposure to sea water or infected shellfish?Answer: V. cholerae The test(s) used for the assay of cholera toxin is/areAnswer: All of these The DNA coding for the production of cholera toxin in Vibrio cholerae is on theAnswer: Chromosome The halophilic bacteria is/areAnswer: All of these