Which of the following statements about mollusks is true?
a. All have visceral ganglia, which control the opening and closing of the shell.
b. Cephalopod mollusks are capable of learning and are considered the most intelligent of the
invertebrates.
c. They have cerebral ganglia, which control the movement of the foot.
d. They have three pairs of ganglia that are unconnected and function independently.
e. They have two pairs of ganglia that are connected in a ladder-like fashion.
B
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DNA and RNA are alike in that they
a. both have same pentose sugar. b. use the same nitrogenous bases to assemble the genetic code. c. have the same number of strands. d. both play vital roles in gene expression. e. are both made in the cytoplasm.
A fish detects vibrations in the water by means of its ________, which contains numerous ________.
A. lateral line; thermoreceptors B. ear; statocysts C. skin; mechanoreceptors D. lateral line; hair cells E. swim bladder; stretch receptors
Which of the following is true about the structure of the microtubule wall?
A) ?-?-tubulin heterodimers are arranged with mixed orientation in each protofilament, and protofilaments are arranged with mixed polarity in the microtubule wall. B) ?-?-tubulin heterodimers are arranged with the same orientation in each protofilament, and protofilaments are arranged with mixed polarity in the microtubule wall. C) ?-?-tubulin heterodimers are arranged with the mixed orientation in each protofilament, and protofilaments are arranged with same polarity in the microtubule wall. D) ?-?-tubulin heterodimers are arranged with the same orientation in each protofilament, and protofilaments are arranged with same polarity in the microtubule wall. E) Orientation of the ?-?-tubulin heterodimers is completely random and depends on which end of the dimer first hits the end of the microtubule when it assembles.
Why are eating disorders that severely restrict food intake very dangerous?
A) Menstruation can cease, which may cause sterility. B) The risk of stroke can increase. C) They can cause Type 1 diabetes. D) They can lead to high blood pressure.