🦠 Microbiology Solved MCQs with Answers

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

1927 solved MCQs

Microaerophilic bacteria are those which requireAnswer: low levels of oxygen for growth (lesser than O2 present in atmosphere) The period between inoculation of bacteria in a culture medium and beginning of multiplication is known asAnswer: lag phase The term aerotolerant anaerobe refers to an organism thatAnswer: doesn't use oxygen but can grow in the presence of oxygen The term obligate anaerobe refers to an organism thatAnswer: is killed by oxygen The fragmentation occurs inAnswer: Nocardia species Allosteric enzymes areAnswer: larger and more complex than simple enzyme Intracellular enzymesAnswer: synthesize cellular material and perform catabolic reaction Enzyme catalase has non-protein metal asAnswer: iron Isozymes or iso enzymes are those enzyme whichAnswer: have different structural forms but identical catalytic properties Enzymes areAnswer: organic compounds produced by living organism Main function of an enzyme is toAnswer: decrease the activation energy Who coined the word enzyme first?Answer: Kuhne The inactive protein from of enzyme isAnswer: apoenzyme The inactive organic molecular portion of enzyme isAnswer: coenzyme Many enzymes consists of a protein combined with low molecular weight organic molecule called asAnswer: co-enzyme Organic molecules that increase the rate of metabolic reactions with themselves changing are known asAnswer: enzymes Protein portion of an enzyme when it is combined with organic molecule is termed asAnswer: apoenzyme The active form of enzyme isAnswer: holoenzyme Enzymes canAnswer: not pass through semipermeable membrane The gas common known as Laughing gas is?Answer: Nitrous Oxide The ability of Vibrio fischeri to convert chemical energy directly into radiant energy in bioluminescence is an example of __________ at work.Answer: the first law of thermodynamics The ability of a competitive inhibitor to bind to an active site in an allosterically controlled enzyme is __________ than the ability of a non-competitive inhibitor to bind to an active site in the same allosterically controlled enzyme.Answer: greater The ability of a competitive inhibitor to bind to an active site in an allosterically controlled enzyme is __________ than the ability of a non-competitive inhibitor to bind to an active site in the same allosterically controlled enzyme.Answer: greater The ability of FADH to be oxidized is __________ than the ability of FAD to be oxidized.Answer: greater The ability of FADH to be oxidized is __________ than the ability of FAD to be oxidized.Answer: greater An endergonic reaction is one thatAnswer: requires energy in order to proceed Reduction is theAnswer: gain of electron If the Keq for an enzymatic reaction is greater than 1, the reactionAnswer: none of these An exergonic reaction is one thatAnswer: releases energy for work If the free energy change (ΔG) in a reaction is a negative value, it indicates that theAnswer: reaction releases energy