It has been said that bacteria are essential for the existence of life on Earth.

Question

It has been said that bacteria are essential for the existence of life on Earth. Which of the following would be the essential function served by bacteria? a) Control of insects b) Directly provide food for humans 12. Decompose organic material and recycle elements Cause disease e) Produce human growth requirements such as insulin Which of the following is not part of a study of microbiology? a) Bacteria b)Viruses c) Viruses d) Insects e) Helminths 13. 14. Use this typical bacterial growth curve to answer questions TIME Which section shows a growth phase where the number of cells dying equals the number of cells dividing? a) A b) B c) C d) D e) A and C Which phase(s) of the graph illustrate(s) a logarithmie change in cell numbers? a) b) c) d) 15. A and C B and D A and B C and D

Explanation / Answer

12. It has been seen that bacteria are essential for exustance of life on earth,the essential function served by bacteria is

C. Decompose organic material and recycle elements.

13. Which of the following is not a part of study of microbiology?

D. Insects.

14. Which of the growth phase shows where number of cells dying is equal to number of cells dividing?

E. A and E

Here there is not relative growth as number ofcell dying is eaual to number of cells dividing.

15. Which phase of the graph illustrates the logarithm changes in cell number?

B. B and D

There is logarithmically increase in phase B and decrease in phase D.

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