Which of the following is a plausible reason for why it may be difficult to treat infections that arise from tooth decay?
A) Biofilm bacteria that cause tooth decay begin to produce endospores as a means to deter effects of antibiotics.
B) Binary fission in biofilm bacteria that cause tooth decay begins to decrease as the biofilm community becomes more complex, thereby producing fewer bacterial cells for antibiotics to penetrate.
C) As the biofilm that causes tooth decay becomes larger, its structure makes it difficult for antibiotics to break through bacterial cell walls.
D) Bacteria of the biofilm that cause tooth decay form a symbiotic relationship with the antibiotics and therefore diminish antibiotic effectiveness.
C
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The ____ regulates the movement of food into the stomach and the ____ regulates the passage of food into the small
intestine.
a. epiglottis; gastroesophageal sphincter b. epiglottis; pyloric sphincter c. gastroesophageal sphincter; epiglottis d. gastroesophageal sphincter; pyloric sphincter e. pyloric sphincter; anal sphincter
A red blood cell was placed in a beaker of solution. The cell immediately began to swell and
ultimately burst. This happened because the cytoplasm of the cell was ____ to the solution in the beaker which was ____.
a. hypertonic; hypotonic b. hypotonic; hypertonic c. hypotonic; isotonic d. hypertonic; isotonic e. isotonic; hypotonic
The femur in a snake and pelvis in a whale are examples of structures.
A. analogous B. homeotic C. vestigial D. heterologous E. homologous
In which vessels would blood pressure be measured the highest?
a. capillaries b. arteries c. veins d. venules e. arterioles