1. Which type of organism was least likely to be found among the earliest living

Question

1. Which type of organism was least likely to be found among the earliest living organisms?

A. fermenter

B. nitrifier

C. thermophile

D. methanogen

2. Which enzyme would you probably not find in a eukaryotic microorganism?

A. Rubisco

B. Pepco

C. Hydrogenase

D. ATPase

3. Organisms that branch near the base of the phylogenetic tree are least likely to be…

A. aerobic

B. chemolithoautotrophic

C. acidophilic

D. hyperthermophilic

4. Which environment is unlikely to support Archaea?

A.   hot spring                       B.   termite gut

C.   deep ocean         D.   archaea are found in all of these habitats

5. Which of the following is not true of anoxygenic photosynthesis?

            A.         Calvin cycle is required

            B.         can proceed under anaerobic conditions

            C.         can proceed using infrared radiation

            D.        all of the above are true

6. Which phylum represents the oldest phylogenetic branch of the bacteria domain?

            A.         Cyanobacteria                                  B.         Aquificae

            C.         Thermoplasmas                   D.        Halobacteria

7. Which group of organisms did not exist before the evolution and radiation of oxygenic phototrophs?

            A. Green non-sulfur bacteria       

            B. Aquificae

            C. Crenarcheota

            D. Chlamydia

Explanation / Answer

Answers:

1. Answer : Option D. Methogen (Since methene gas was found in earliest living organisms)

2.Answer: Option C : Hydrogenase ( This enzyme catalyses molecular hydrogen, there is rare chanc of finding molecular H2 in eukaryotes.)

3.Answer: Option B. chemolithoautotrophic (These microbes grow in chemical and also on rocks and can survive, assume these should be the earliest living organisms should come on the base of phylogenetic tree)

4. Answer: Option :D.   archaea are found in all of these habitats

5.Answer: Option :D. all of the above are true (Calvin cycle is required is all kinds of photosynthesis, it can happen in anaerobic condition, oxygen is not used as electron donor , under infrared also this process could happen)

6. Answer: Option   A. Cyanobacteria   

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