2 pts Question 39 When life first appeared, the atmosphere had no oxygen. Thus,

Question

2 pts Question 39 When life first appeared, the atmosphere had no oxygen. Thus, you can expect that the first living forms were: O Photosynthetic, using light to produce oxygen O Aerobic, using oxygen to obtain energy O Anaerobic, using inorganic substances for energy and food O Heterotrophic, using organic substances for food Question 40 2 pts Bacteria transformation is the process in which: O a bacterium uptakes genetic information from the environment O a prokaryotic process for cell division O bacteria exchänge occurs by copying a plasmid and passing It from one bacterium to another O a bacteriophage accidentally copies genetic information from one bacterium and inserts it into the next cell it infects. Question 41 2 pts

Explanation / Answer

39. Correct answer:- (C) anaerobic,using inorganic substances for energy and food.
Explanation:- In earliest environment there was no oxygen.

40. Correct answer:- (C) bacteria exchange occurs by copying a plasmid and passing it from one bacterium to another.
Explanation:- bacterial transformation occurs by following method-
     - conjugation
     - transduction
     - direct contact

41. Correct answer:- (a) chemheterotrophs
Explanation:- chemheterotrophs make their energy and from organic molecules.

42. Correct answer:- (b) in the presence of energy sources, organic molecules can be synthesized from inorganic molecules.
Explanation- miller urey experiment showed that in Presence of energy organic molecules can be synthesized by inorganic molecules.

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