Which is a characteristic of the phylum Chordata?
A. They have a notochord.
B. They have a pseudocoelom.
C. They do not have true tissues.
D. They have a gastrula with only two germ layers.
Ans: A. They have a notochord.
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Which of the following types of inhibitor permanently alters the enzyme it inhibits? Select all correct choices
A. an irreversible inhibitor B. a competitive inhibitor C. a non-competitive inhibitor D. both an irreversible inhibitor and a competitive inhibitor
Which age structure is common in developed countries with zero population growth?
a. High percentage of middle-aged and older individuals b. High percentage of young individuals of reproductive age c. High percentage of individuals who do not live to old age d. High percentage of young and middle-aged individuals
The gut cavity may be a fully lined coelom or a
partially lined __________. Fill in the blank(s) with the appropriate word(s).
The boundary that surrounds the contents of the nucleus is the
a. plasma membrane. b. nuclear envelope. c. nuclear pore. d. cytosol.