In addition to their characteristic cilia, most ciliates contain two types of
A. cysts.
B. wood-digesting enzymes.
C. flagella.
D. chloroplasts.
E. nuclei.
Answer: E
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All multicellular organisms have:
A. organs and organ systems. B. specialized and differentiated cells. C. predators. D. mechanisms for cell-cell adhesion.
The active site for carboxypeptidase
A) contains amino acids that are contiguous to one another along the primary sequence of the protein. B) uses iron as the prosthetic group. C) involves only 6 out of a total of 307 amino acids. D) contains a glutamate residue at position 69. E) is formed by the interaction of two polypeptide chains.
Honeybees must maintain specific temperatures to thrive. On hot days, the hive can quickly
overheat, so some bees will stand near the entrance and fan their wings to provide cool air currents into the hive. In winter, honeybees cluster together in their hives and vibrate their wings in a form of shivering to generate heat and maintain the hive at a constant temperature. This heating and cooling is a form of
a. homeostasis. b. evolution. c. competition. d. homology
White smokers produce a fluid rich in:
a. copper sulfide. b. iron sulfide. c. zinc sulfide. d. magnesium sulfide. e. sodium chloride.