Naturally-produced penicillins are most effective against gram-positive bacteria because _______.
Fill in the blank(s) with the appropriate word (s).
Answer: they prevent the synthesis of peptidoglycan which comprises the gram-positive cell wall
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_____ vertebrae are found in the lower back
1.Cervical 2.Thoracic 3.Lumbar 4.Sacral
Branches of a bronchus are known as ____
a. larynx b. bronchi c. bronchioles d. trachea e. pharynx
Which of the following statements about skeletons is NOT true?
A. All exoskeletons must be shed as the animal grows. B. An earthworm has a fluid-filled cavity that acts as a hydrostatic skeleton. C. The skeleton of a clam is an exoskeleton. D. The skeleton of an arthropod is an exoskeleton. E. The skeleton of a vertebrate is an endoskeleton.
What is the process in which impulses jump from node to node?
A. Incomplete transfer B. Saltatory conduction C. Repolarization D. Refractory action E. Facilitated transmission