Ti plasmids in the species Agrobacterium tumefaciens

A. carries the genes needed for formation of bacteroids.
B. is required for nitrogen fixation.
C. causes the formation of tumors.
D. carries the genes needed for root nodule development.


Answer: C

Biology & Microbiology

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All the following utilize detritus for food except

a. filter-feeders. b. grazers. c. suspension-feeders. d. detritus-feeders.

Biology & Microbiology

The plant movement in the accompanying figure is caused by ____

a. auxin differences in two sides of the stems b. gibberellin released in one side of the leaf c. abscisic acid in two sides of the stems d. salicylic acid in two sides of the roots e. cytokinin differences in two sides of the stem

Biology & Microbiology

A slimy layer of bacteria coating a surface is also known as

a. prokaryocommune b. bioaggregate c. tissue d. biofilm e. plague

Biology & Microbiology

Koch's postulates can be used to determine the causes of infectious diseases

Indicate whether the statement is true or false

Biology & Microbiology