Bacterial Conjugation and Gene Transfer

The video explains horizontal gene transfer in bacteria, contrasting it with vertical gene transfer. It covers three methods: conjugation, transformation, and transduction. Conjugation involves direct contact and plasmid transfer, transformation involves uptake of extracellular DNA, and transduction involves bacteriophages. These processes contribute to genetic diversity and adaptation in bacteria.

What is the primary difference between horizontal and vertical gene transfer?

• Horizontal transfer involves the exchange of genes within the same generation, while vertical transfer occurs from parent to offspring.

• Horizontal transfer involves the exchange of genes between different species, while vertical transfer occurs within the same species.

• Horizontal transfer is a slower process compared to vertical transfer.

• Horizontal transfer occurs between different generations, while vertical transfer occurs within the same generation.

Which method of horizontal gene transfer is most common in bacteria?

• Conjugation

• Mutation

• Transduction

• Transformation

What is required for conjugation to occur between bacteria?

• A shared environment

• A competent state

• Direct cell-to-cell contact

• Presence of a bacteriophage

In gram-negative bacteria, what structure is involved in conjugation?

• Conjugation pilus

• Cell wall

• Flagellum

• Ribosome

What is the role of transposase in bacterial conjugation?

• It forms the conjugation pilus.

• It helps in the replication of plasmids.

• It catalyzes the cutting and resealing of DNA.

• It induces the lytic cycle in bacteriophages.

What is the term for bacteria that can take up large amounts of DNA?

• Competent

• Transformed

• Lysogenic

• Conjugative

How do competent bacteria acquire new DNA?

• By using a conjugation pilus

• By binding and incorporating environmental DNA

• By forming mating pairs

• Through the lytic cycle

What is a bacteriophage?

• A plasmid involved in conjugation

• A virus that infects bacteria

• A type of bacteria

• A transposon

During which cycle does a bacteriophage integrate its genome with the bacterial chromosome?

• Transformation cycle

• Lysogenic cycle

• Conjugation cycle

• Lytic cycle

Why do bacterial genomes not keep getting larger despite acquiring new DNA?

• Because they have a fixed genome size

• Because they only acquire beneficial genes

• Because non-beneficial genes are lost by deletion

• Because they do not acquire new DNA