Biology - Study Mode
[#676] Floridian starch is characteristic energy storage material of which algae?
Correct Answer
(C) Red algae
Explanation
Solution: 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.
[#677] Statement which is true about bacteria ?
Correct Answer
(B) Most of them are heterotrophs but some are autotrophs
Explanation
Solution: Most of the bacteria are heterotrophs but some are autotrophs.
[#678] Lederberg and Tatum demonstrated conjugation in the bacteria in
Correct Answer
(C) 1946
Explanation
Solution: 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.
[#679] The individual chain of cells or filament in the colony of Nostoc is known as
Correct Answer
(A) Trichome
Explanation
Solution: 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.
[#680] Under the ideal environmental conditions bacterial cells divide at the rate of division per twenty
Correct Answer
(B) Minutes
Explanation
Solution: 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.