1) Which of the following statements about the bacterium Rhizobium is NOT true?

Question

1) Which of the following statements about the bacterium Rhizobium is NOT true?

a. cells of Rhizobium infect the root hairs of leguminous plants

b. cells of Rhizobium form nodules in leguminous plants

c. cells of Rhizobium protect leguminous plants against ammonia that is applied on crops as fer6lizer

d. cells of Rhizobium ?x nitrogen in plant nodules
2) Which of the following can be done by prokaryotes and eukaryotes:

a. Methane producton b. Methane oxidaton c. Nitrogen ?xaton d. Ammonia metabolism e. Carbon dioxide ?xaton without relying on photosynthesis

3) You have one copy of a small gene that you wish to amplify by the polymerase chain reacton (PCR). Ader 7 replica6on cycles, how many double-stranded DNA molecules do you have? a. 16 b. 32 c. 64 d. 128

Explanation / Answer

Question number 1- Rhizobium not protect the plant against ammonia. Rhizobium only fix the nitrogen symbiotically and provide Nitrogen to plants.

Question number 2- These all processes are done by prokaryotes.

Question no 3- option D. the replication in PCR is like DNA replication in semi conservative mode . Each new strand formed used as template and it multiple in a way that 2-4-8-16-32-64-128.

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