Some bacteria are resistant to antimicrobials due to the activity of ________, which removes many of them.

A. plasmids
B. porins
C. efflux pumps
D. lipopolysaccharides
E. ribosomes


Answer: C

Biology & Microbiology

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Refer to the paragraph about the formation of the Isthmus of Panama. If the isthmus formed gradually rather than suddenly, what pattern of genetic divergence would you expect to find in these species pairs?

A) similar percentages of difference in DNA sequence between all pairs of sister species B) greater percentage of difference in DNA sequence between species that inhabit deep water than between species that inhabit shallow water C) greater percentage of difference in DNA sequence between species that inhabit shallow water than between species that inhabit deep water

Biology & Microbiology

The pH of stomach acids is usually ____or lower

a. 2 b. 4 c. 7 d. 10 e. 12

Biology & Microbiology

The first amino acid delivered during translation is ____

a. tyrosine b. alanine c. proline d. methionine e. valine

Biology & Microbiology

Segmentation is the primary means of mechanical breakdown of food in the digestive tract

Indicate whether the statement is true or false

Biology & Microbiology