PNB 2250 EXAM 1 PRACTICE
QUESTIONS AND ASNWERS
Which statement is true?
a. Heme is commonly found within seawater
b. Heme-based proteins played a key role in the metabolism of carbon dioxide into forms less toxic to
cells.
c. Heme-based proteins likely developed as a means by which Fe was tra...
a. that an animal can have less blood volume (on a % basis) than an animal with a two...chambered heart
b. an animal can also use peristalsis to move blood around the body.
c. the ability to have two blood circuits within the body.
d. the ability to pump different volumes of blood from the two ventricles. - Ans:✔✔-c. the ability to have
two blood circuits within the body.
An open circulation system ...(E1)
a. can use peristalsis or a simple heart.
b. is inversely related to body size.
c. is a high-pressure (>150 mm Hg) system.
d. requires less blood volume that a closed circulatory system.
e. only occurs in extremely small (<1 cm) animals. - Ans:✔✔-a. can use peristalsis or a simple heart.
Respiratory proteins ...(E1)
a. increase the carbon dioxide carrying capacity of water up to 50-fold.
b. have a fixed affinity for oxygen
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