Plasmid cloning vector DNA is usually introduced into bacterial hosts by

A. ligation.
B. transformation.
C. plasmolysis.
D. transduction.


Answer: B

Biology & Microbiology

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Specific cells in developing seeds and maturing fruits have receptors for ethylene, but cells in stems

generally do not.

Indicate whether the statement is true or false.

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When a cell releases chemicals that act as signals into the extracellular fluid to affect cells, this is an

example of

a. autocrine regulation. b. endocrine regulation. c. paracrine regulation. d. systemic regulation. e. exocrine regulation.

Biology & Microbiology

When microbes live independently but cooperate and share nutrients, it is called ________.

A. mutualism B. antibiosis C. synergism D. symbiosis

Biology & Microbiology

Group A streptococci are considered more virulent if their cytoplasmic membrane contains M protein.

Answer the following statement true (T) or false (F)

Biology & Microbiology