Gramicidin is an antibiotic that increases the permeability of bacterial cell walls to inorganic ions. What is the most likely mode of action of gramicidin?

A) It acts by active transport.
B) It causes membranes to fuse with one another.
C) It forms a channel in the membrane.
D) It removes electrical charges from solutes.


Answer: C

Biology & Microbiology

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When a population is small relative to its carrying capacity, its growth will be:

A. geometric. B. exponential. C. logistic. D. both geometric and exponential. E. both geometric and logistic.

Biology & Microbiology

Which of the following is in the correct sequence?

A) Kingdom, Class, Division, Order, Family, Genus B) Kingdom, Division, Class, Order, Family, Genus C) Kingdom, Division, Order, Class, Family, Genus D) Kingdom, Order, Division, Class, Family, Genus

Biology & Microbiology

Emphysema is caused by an increase in elastase, an enzyme that breaks down elastin. Predict the symptoms you would expect to see in a patient with emphysema.

A. Decreased ability of the lungs to expand and contract. B. Thickening of the extracellular matrix. C. Thinning of vertebral discs. D. Thinning of the cell wall. E. Thickening of the cell wall.

Biology & Microbiology

Who was responsible for establishing the classification system that uses binomial nomenclature?

a. Charles Darwin b. Louis Pasteur c. Carolus Linnaeus d. Jean-Baptiste Lamarck e. Gregor Mendel

Biology & Microbiology