BIO 221 MICROBIOLOGY Genetics Review Exam Q & A 2026 (Complete And Verified Study material) (20pages) LEARNEXAMS

1. Which of the following genetic mechanisms is primarily responsible for bacterial resistance to antibiotics? A) Mutation B) Conjugation C) Transduction D) Transformation Answer: B) Conjugation. Rationale: Conjugation involves the transfer of genetic material between bacteria through direct contact, often transferring genes that confer antibiotic resistance. 2. In the context of microbial genetics, what is a plasmid? A) A segment of DNA within the bacterial chromosome B) A mobile genetic element that can integrate into the chromosome C) A self-replicating genetic element independent of the chromosome D) A viral genome integrated into the bacterial DNA Answer: C) A self-replicating genetic element independent of the chromosome. Rationale: Plasmids are extrachromosomal DNA that can replicate independently and often carry genes that can be beneficial to the bacterium, such as antibiotic resistance genes. 3. What is the role of transposons in microbial genetics? A) They are involved in the regulation of gene expression. B) They facilitate the repair of damaged DNA. C) They assist in the attachment of bacteria to host cells. D) They can move from one DNA molecule to another, causing genetic variation. Answer: D) They can move from one DNA molecule to another, causing genetic variation. Rationale: Transposons, also known as jumping genes, can move within and between genomes, creating mutations and genetic diversity. 4. Which process describes the transfer of genetic material from one bacterium to another through a bacteriophage? A) Mutation B) Conjugation C) Transduction D) Transformation