The skeletons of rays and skates are made of

A) protein slime.
B) bone.
C) muscle.
D) cartilage.
E) chitin.


D

Biology & Microbiology

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Astrocytes

a. are a type of neuroglial cell found in the brain. b. make nerve growth factor. c. play a role in immune defenses. d. make lactate to fuel active neurons. e. include all of these descriptions.

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Pasteur

A. employing a swan-neck flask. B. being the first researcher to work under sterile conditions. C. demonstrating the synthesis of organic molecules. D. showing that maggots arise from eggs laid by flies.

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The causative agent of Lyme disease is

A) Borrelia hermsii B) Ixodes scapularis C) Leptospira interrogans D) Ixodes pacificus E) Borrelia burgdorferi

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