Which of the following is a characteristic of octopuses and squid?

a. an open circulatory system
b. a closed circulatory system
c. the presence of mesohyl
d. a single heart


b. a closed circulatory system

Biology & Microbiology

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Saprophytic fungi are able to digest organic molecules outside of the organism by means of:

A) apoenzymes. B) coenzymes. C) endoenzymes. D) exoenzymes.

Biology & Microbiology

Which of the following would be considered a macromolecule? 

A. CO2 B. ammonia C. egg protein D. hydrochloric acid

Biology & Microbiology

Mycorrhizae help plants obtain water from the soil

Indicate whether the statement is true or false

Biology & Microbiology

Which statements correspond to amphibolic pathways? 1. anabolic and catabolic reactions are joined through common intermediate 2. shared metabolic pathways 3. Feedback inhibition can help regulate rates of reactions 4. both types of reactions are necessary but do not occur simultaneously

A) 1 only B) 1, 2, 3 C) 1, 2, 3, 4 D) 2, 4 E) 2, 3, 4

Biology & Microbiology