Cartilaginous fishes differ from lampreys because they
A) have a three-chambered heart.
B) are ectotherms.
C) lack a skull.
D) lack a skeleton.
E) have jaws.
E
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The methanogens
A. are part of the Domain Archaea. B. oxidize hydrogen gas to produce methane. C. appear only in aerobic environments. D. use oxygen as a terminal electron acceptor. E. are part of the Domain Archaea AND oxidze hydrogen gas to produce methane.
The zygote goes through ____ to become a(n) ____
a. cleavage; blastula b. cleavage; gastrula c. zygote formation; embryo d. cleavage; egg e. fertilization; blastula
Refer to Figure 40-5. The molecules required to bind at the sites labeled 1 and 2 for a cross bridge to
form are:a. Ca2+ and myosin. b. ADP and myosin. c. myosin and troponin. d. ATP and Ca2+. e. tropomyosin and O2.
Chemicals produced by an individual that influence the behavior of members of the same species are called
A) hormones. B) pheromones. C) enzymes. D) steroids. E) stimuli.