True or False: Fleshy-finned fish (coelacanth and lungfish) are the fish very closely related to tetrapods

A. true
B. false

A

Biology & Microbiology

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The dose of an antigen that kills 50% of animals in a test group and is used to estimate the virulence of a pathogen is known as

A) Antigen dose50. B) Virulence-50. C) LD50 (lethal dose50). D) Death rate-50.

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Biology & Microbiology

Which of the following species concepts might differentiate species on the basis of specific dietary requirements?

A. Ring species B. Ecological species C. Evolutionary species

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Biology & Microbiology

The unique set of proteins located on the surface of cells that distinguish one organism from another are the ________

Fill in the blank(s) with correct word

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Biology & Microbiology

Treadmilling of actin filaments only occurs in a test tube.

a. true b. false

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Biology & Microbiology