The vertebrates that lack jaws are called

A. turtles.
B. lampreys.
C. rays.
D. eels.


Answer: B

Biology & Microbiology

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In order for a muscle to contract, calcium ions released from the sarcoplasmic reticulum must bind to

A. myosin. B. ATP. C. tropomyosin. D. troponin. E. actin.

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What are responsible for the rapid mobilization of

the immune response after a subsequent attack by a pathogen? a. naive B cells b. naive T cells c. NK cells d. memory cells e. macrophages

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Amino acids and other organic molecules were formed in the laboratory of Miller and Urey from

which of the following? a. heat, electrical discharge, water, nitric oxide, and carbon dioxide b. heat, ultraviolet radiation, water, carbon dioxide, and amines c. heat, infrared radiation, water, carbon dioxide, and free nitrogen d. hydrogen, methane, water, ammonia, and electrical discharge e. ultraviolet radiation, electrical discharge, carbon dioxide, nitrogen, and ammonia

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