What stage of sewage treatment produces methane?
A) primary treatment
B) secondary treatment
C) tertiary treatment
D) sludge digestion
E) None of the stages of sewage treatment produce methane.
D
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Which of the following statements about muscles is correct?
A. Smooth muscles contract more slowly than skeletal muscles. B. Actin and myosin are arranged irregularly in cardiac and smooth muscles. C. Skeletal muscles are striated, whereas cardiac muscles are not. D. Striated muscles use actin and myosin to generate force, whereas smooth muscles do not. E. Cardiac muscles are found in the heart and the walls of the arteries.
Which of the following statements about insect hormones is false?
A. High levels of circulating juvenile hormone inhibit molting. B. Ecdysone is released from the prothoracic gland and stimulates molting. C. PTTH stimulates the release of ecdysone to trigger molting and metamorphosis. D. In the absence of juvenile hormone, an insect will metamorphose into the adult form. E. None of the answer options is false.
The relatively simple excretory system used by flatworms consists of tubules called ____
a. nephrons b. hepatic tubules c. metanephridia d. Malpighian tubules e. protonephridia
Bacteria can function in all the following roles in an ecosystem, except as a
A. consumer. B. primary producer. C. decomposer. D. parasite. E. Bacteria can function in all the roles listed.