Which of the following does NOT have an exoskeleton?

a. lobsters
b. spiders
c. insects
d. earthworms
e. centipedes


ANSWER: d

Biology & Microbiology

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Most fossils form most often in sedimentary rock

1.True 2.False

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Hotspot regions make up only 2 percent of the total land mass but contain what percentage of the world's endemic plant species?

A) 2 percent B) 50 percent C) 75 percent D) 90 percent

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Methylene blue can be used to stain DNA because

A. DNA is negatively charged. B. changes the pH and therefore the structure of DNA. C. covalently bonds with DNA. D. makes DNA electron dense. E. is an effective fixing agent for nucleic acids.

Biology & Microbiology

Which of the following substances is commonly used to inactivate microbes?

A. formaldehyde B. alcohol C. synthetic detergents D. fluorescent dyes E. alum

Biology & Microbiology