Dogs have ________ and snails have _______
a. exoskeletons; hydroskeletons
b. exoskeletons; endoskeletons
c. hydroskeletons; endoskeltons
d. endoskeltons; exoskeletons
e. endoskeltons; hydroskeletons
E; Dogs, as vertebrates, have an endoskeleton. Snails (and many other invertebrates such as worms) have only soft body parts and rely on muscles acting against confined fluid spaces in order to move.
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What would happen if all of the structures corresponding to the one labeled 6 in Figure 41-1 were
removed from the neuron? a. Impulse transmission would be faster. b. Impulse transmission would be slower. c. Impulse transmission would cease. d. Continuous conduction would occur. e. There would be no effect on transmission
A lipid membrane is present in which of the following?
A) naked viruses B) enveloped viruses C) prions D) viroids E) both prions and viroids
According to the law of independent assortment,
a. all possible combinations of factors can occur in the gametes. b. only the parental combinations of gametes can occur in the gametes. c. only the nonparental combinations of gametes can occur in the gametes.
The concept of evolution has always been connected with some notion of progress–natural selection pushing populations toward better and better adaptations to create "perfect organisms." How would you argue that evolution does not craft perfect
organisms? What will be an ideal response?