Question

Simplest organism would be
A. Nostoc
B. Escherichia
C. Bacillus
D. Thermus

Answer 1

$\sf{\orange✭\: ANSWER \:\green✭}$

$\sf{(A) \:Nostoc}$

The simplest organism refers to the organism that has the least complex structure and the smallest genome size. Among the given options, Nostoc, Escherichia, Bacillus, and Thermus are all prokaryotic organisms, meaning they lack a true nucleus and other membrane-bound organelles.

• Nostoc is a genus of cyanobacteria that are commonly found in soil and aquatic environments. They are simple unicellular or filamentous organisms with a photosynthetic mode of nutrition.

• Escherichia coli (E. coli) is a type of bacteria commonly found in the intestines of humans and other animals. They are also unicellular organisms and have a relatively simple structure.

• Bacillus is a genus of bacteria that is widely distributed in nature and includes both aerobic and anaerobic species. They are generally larger than Nostoc and E. coli, and some species can form spores that can survive harsh environmental conditions.

• Thermus is a genus of bacteria that is often found in hot springs and other high-temperature environments. They are larger than the other three organisms and have a more complex structure, including a unique type of enzyme that is used in PCR (polymerase chain reaction).

Based on the above characteristics, the simplest organism among the given options would be Nostoc. Therefore, the correct answer to the MCQ is (A) Nostoc.

Regards,

CreativeAB

Answer 2

Answer:

D)thermus

Explanation:

life may have originated in the oceans in underwater hot springs called Hydrothermal vents.These vents could have supplied energy and raw materials for the origin and survival of early life form(thermus)which is a bacterium.