Question

(1).

What are the common characteristics of the bacterial group commonly called the enterics?

Select one:

a. Gram negative, rods, facultative anaerobes, inhabit intestinal tracts

b. Gram negative, cocci, obligate aerobes, inhabit intestinal tracts

c. Gram positive, rods, obligate anaerobes, inhabit spinal cord and brain

d. Gram positive, spirilla, microaerobes, inhabit spinal cord and brain

(2)

Which of the following statements is correct?

Select one:

a. Microorganisms represent a much smaller amount of Earth's biomass than animals.

b. Microorganisms are significant contributors to the total biomass on Earth.

c. Microorganisms are significant in number, but not in overall biomass.

d. Microorganisms represent a much smaller amount of Earth's biomass than plants.

(3)

Archaea differ from bacteria in that archaea

Select one:

a. use organic compounds for food.

b. have diverse cell wall compositions.

c. lack nuclei.

d. are prokaryotic.

e. reproduce by binary fission

(4)

Answer 1

1-(A) enteric Bacteria , gram negative rods facultative anaerobes, inhabit intestinal tract

2-(B) microorganisms produce significant biomass on earth About A census published by the PNAS in May 2018 gives for bacterial biomass ~70 billions of tonnes of carbon, equal to 15% of the whole biomass.

3-(B) Archea have different cell wall composition

Bacterial cell walls have peptidoglycan (mesh-like structure also known as murein); archaeal cell walls do not have peptidoglycan