Practice MCQ Questions and answers on Biology-GK

Answer: Option C

Bacterial conjugation was first described by Lederberg and Tatum in 1946 as a phenomenon involving the exchange of markers between closely related strains of Escherichia coli.

Answer: Option A

If you look at Nostoc structure under a microscope, you will see thread-like filaments, called trichomes. Each trichome is really a chain of round or bead-like cells that lack a nucleus.

Answer: Option B

Bacteria do not grow and multiply the same way as animals or humans. They take in nutrients and reproduce by dividing – one bacteria splits and becomes two bacteria, two become four, four become eight and so on. Under ideal conditions, many types of bacteria can double every 20 minutes.