Practice MCQ Questions and answers on Biology-GK

Bacteria are probably the simplest and the smallest living organisms possessing cellular organisation.

Anisogamy (also called heterogamy) is the form of sexual reproduction that involves the union or fusion of two gametes, which differ in size and/or form.

The floridian starch is reserve food materials in the red algae or the members of class Rhodophytae. It is a characteristic feature of this group.

Virus is not a cell; it remains just in the form of a genetic material or encapsulated on outside with a protein capsid. It generally injects its genetic material into host cells wherein the viral proteins get synthesised.

Most of the bacteria are heterotrophs but some are autotrophs.

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.

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.

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.

The virus is nucleic acid and protein.

Infectious diseases can be caused by: Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis.