🦠 Microbiology Solved MCQs with Answers

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

1927 solved MCQs

In anaerobic respiration, the final electron acceptor can beAnswer: nitrate Which one of the following is not produced in any of the steps of glycolysis?Answer: NAD⁺ The number of ATP molecules produced from one glucose molecule by a bacterium producing lactic acid isAnswer: approximately equal to producing ethanol Which of the following is the most complete definition of fermentation?Answer: Oxidation of glucose with organic molecules serving as electron acceptors The enzymes that catalyze the reactions of the Krebs cycle are found in which subcellular organelle of eukaryotes?Answer: Mitochondrion Fatty acids are oxidized to acetyl-CoA by which of the following pathways?Answer: β-oxidation In the time since E. coli and Salmonella diverged evolutionarilyAnswer: E, coli has lost approximately 50% of its genome Which of the following theory is supported by the genomic sequence of the obligate intracellular parasite Rickettsia prowazekii ?Answer: Mitochondria have evolved from endosymbiotic bacteria The physical nature of genomes is studied underAnswer: structural genomics The species of bacteria, which possesses 250 genes for lipid biosynthesis isAnswer: M. tuberculosis Why the bacterium Treponema pallidum is difficult to culture?Answer: Because it lacks the genes needed for TCA cycle and oxidative phosphorylation What is the range of minimum set of genes required for life?Answer: 250-350 genes The flow of genetic material in microbial cells usually takes place fromAnswer: DNA through RNA to proteins Which of the following is used for determining the location of specific genes within the genome?Answer: Annotation Proteomics isAnswer: the study of the entire collection of proteins expressed by an organism Which of the following is concerned with the management and analysis of biological data using computers?Answer: Bioinformatics Which type of genomics studies the transcripts and proteins expressed by a genome?Answer: Functional genomics Which of the following is the study of the molecular organization of genomes, their information content and the gene products they encode?Answer: Genomics The word, used for the small solid supports onto which are spotted hundreds of thousands of tiny drops of DNA that can be used to screen gene expression, isAnswer: DNA microarrays Which of the following organisms has the smallest genome?Answer: M. genitalium Studies of similarities and differences among the genomes of multiple organisms is carried out inAnswer: comparative genomics Why Deinococcus radiodurans is able to survive massive exposure to radiation?Answer: Because it has many copies of genes encoding DNA repair In DNA sequencing, the primerAnswer: specifies where the sequence begins The chromosome of almost all bacteria is in the shape ofAnswer: a closed circle In which of the following uracil is present?Answer: RNA To which of the following adenine always binds?Answer: Thymine Guanine always binds toAnswer: cytosine The function of ribosomes within the cell isAnswer: to synthesize proteins According to base pairing rules the bases of one strand match-up with the bases of the second strand of DNA and the two strands are said to beAnswer: complementary RNA that is complementary to a segment of another RNA molecule to which it will bind is known asAnswer: antisense RNA