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

Biology & Microbiology

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_____ vertebrae are found in the lower back

1.Cervical 2.Thoracic 3.Lumbar 4.Sacral

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Branches of a bronchus are known as ____

a. larynx b. bronchi c. bronchioles d. trachea e. pharynx

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology