Nitrogen ___________ A)is a growth-limiting nutrient for many organisms. B)is used to build proteins and carbohydrates. C)is extracted from the atmosphere by a few types of bacteria. D)Both A and C are correct. E)A, B, and C are correct.

a)  bacteria are “obligate anaerobes.” What does this mean? On Earth, where might these organisms live? (Give examples.) b) Humans (and most Eukaryotic organisms) are obligate aerobes. What does this mean? On Earth, where might these organisms live? (Give examples.)

Which percentage of medical waste is infectious or hazardous? A) 25% B)50% C)75% D) 85%

Which of the following occurs when a biofilm (or a part of it) begins to starve or experiences oxygen depletion? A) O attachment B) O quorum sensing C) O EPS (exopolysaccharide) production D) O dissolution or dispersal E) O biofilm maturation

12. Enzymes that can be shut down or activated based on the presence of chemicals in their environment are called a) holoenzymes b) repressed c) constitutive d) regulated 13. An organism with a temperture growth range of 45°C to 60°C would be called afn) a) extremophile b) psychrotroph c) thermoduric d) psychrophile d) thermophile 14. When microbes are in a close nutritional relationship, and one benefits but the other is not harmed it is called a) symbiosis b) satellitism c) commensalism d)mutualism e)synergism 15. The term obligate refers to a) the ability to exist in a wide range of conditions b) existing in a very narrow niche c) using chemicals for energy production d) using oxygen for metabolism 16. The E. coli that normally live in the human large intestines and produce vitamin would best be termed a relationship a) parasitic b) saprobic c) commensal d) mutualistic 17. A holoenzyme is a combination of a protein and a substance called a) apoenzymes bị cofactors c) catalysts…

Identify microorganisms responsible for nitrogen fixation

Dissimilatory nitrate reduction carried out by bacteria can lead to loss of nitrogen as N, from the environment. A) O True B) O False

The time interval required for the formation of two cells from one is called the A) generation time. B) growth time. C) growth rate. D) division rate.

When my environment dries out, i am capable of losing all the water from my body and surviving in this dormant state for many years in the chance that water may someday return. This unique truck I preform is called... 1.) Autohydro resuscitation  2.) Torpor 3.) Dessication 4.) Bioaqueous estivation  5.) Anhydrobiosis

After some time, you found out that you did not like working in microbiology lab, so you found a job at an Environmental lab. Some park attendants said that their dogs took a dive in one of the park’s ponds and after few days they became sick. So, you went to the park and took a sample of the water to analyze it 14) Name the disease or sickness they cause in humans15) Name the phenomenon they are responsible for in marine habitats16) What do these organisms use for movement?17) If these organisms reproduce at a high rate, what will happen to the other aquatic life forms living in the pond? Why