An antibiotic kills 99.9% of a bacterial population. What will be the result of the continued application of this antibiotic?
A) Every time the antibiotic is given, it will kill 99.9% of the bacterial population.
B) Through time, the antibiotic will become less effective at killing the bacteria.
C) Eventually, the entire bacterial population will be wiped out.
D) The bacterial population will reach an equilibrium point at which the antibiotic is 50% effective.
B
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Other than the proteins that they encode, what is a major difference between cell-specific and housekeeping genes?
a. Cell-specific genes are expressed only in a single cell type; housekeeping genes are expressed in all cell types. b. Cell-specific genes have promoter proximal elements and enhancers; housekeeping genes have only promoter proximal elements. c. Cell-specific genes have promoter proximal elements that use cell-specific activators; housekeeping genes use "universal" activators. d. Cell-specific genes are only found in certain cell types; housekeeping genes are found in all cell types. e. Cell-specific genes have promoter proximal elements that use "universal" activators; housekeeping genes have promoter proximal elements that respond only to specific activators.
To meet the high oxygen demands of flight,
birds
a. use simple lungs. b. use air sacs connected to their lungs. c. use carbon dioxide for respiration. d. can diffuse oxygen through their skin. e. use simple lungs, and can diffuse oxygen through their skin.
What does the accompanying figure represent?
a. an acid and a base b. two different ions c. a cation and an anion d. two different elements e. two isotopes of the same element
Describe how to diagnose a lower urinary tract infection (UTI) and differentiate between common bacterial causes
What will be an ideal response?