Which of the following is true regarding some insect tracheal systems?
a. They are associated with the blood circulatory system.
b. They excrete body wastes as well as transport gases.
c. Their spiracles can become clogged by spraying them with oil.
d. The tracheal tubes are continually open in large terrestrial insects.
e. They contain respiratory pigments to enhance oxygen transport.
ANSWER: c
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Which of the following is incorrect with respect to translation and the genetic code?
A. In bacteria, there is a direct correlation between the order of amino acids and the order of nucleotides in the gene encoding for a protein. B. The insertion of one or two nucleotides into the coding sequence will cause a shift in the reading frame. C. A codon is three nucleotides in length. D. AUG is the start codon and encodes for a methionine (or derivative of methionine) at the carboxyl end of the protein.
What is the elongated extension of a neuron that nerve impulses travel along?
A. axon B. cell body C. dendrite D. oligodendrocyte E. synapse
The female gametophyte in flowering plants is usually consists of
a. a complete pistil. b. seven cells embedded in floral tissues. c. a single ovary. d. a seed. e. shoot parts bearing female flowers.
In cnidarians, nematocysts are important in
a. food digestion. b. excretion of wastes. c. obtaining oxygen from the water. d. obtaining prey. e. movement.