Which of the following is NOT a characteristic of amphibians?
A. They have lungs.
B. They have a cartilaginous skeleton.
C. They are ectothermic.
D. They have a three-chambered heart.
E. They have vertebrae.
Answer: B. They have a cartilaginous skeleton.
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In an acidic solution, the concentration of hydrogen ions is _________ hydroxide ions.
a. less than b. greater than c. equal to d. cannot be determined
Mesoglea is found in which of the following groups?
a. sponges b. cnidarians c. round worms d. annelids e. mollusks
The method of DNA replication, where each original strand is used as a template to build a new strand, is called the
A. disruptive method. B. replication and amplification method. C. semiconservative method. D. continuous method. E. conservative method.
The ________ joints have no joint cavity and usually do not permit movement. Sutures between skull bones are this kind of joint
Fill in the blank(s) with correct word