Hagfishes are differentiated from lampreys and all other fishes in that:a
hagfishes lack gills.
b. hagfishes lack a jaw.
c. hagfishes are parasitic.
d. hagfishes lack vertebrae.
e. hagfishes have notochords.
d
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Malarial parasites are able to evade the active immune response by
a. remaining inside the host cells throughout the whole infection, thereby avoiding exposure to antibodies in the bloodstream. b. secreting substances that block the binding and recognition of their protein by host B cells. c. changing their coat proteins so that the host antibodies in current production cannot bind to them. d. overwhelming the immune cells and antibodies by an enormous production of parasitic cells. e. interfering with the production of memory cells, so that subsequent infections are just as deadly as initial ones..
When the Darwin/Wallace theory of natural selection is summarized, four central postulates emerge. Which of the following is NOT one of these four natural selection postulates?
A) Variations exist in any given generation of a species. B) Variations in traits are produced by mutations. C) Variations are, at least in part, heritable. D) Those individuals whose variations confer an advantage are more likely to survive and reproduce.
Muscle cells store energy in the form of ________ until it is used for the production of ATP
A) glucose B) starch C) glycogen D) glycerol E) sucrose
A tadpole is a(n)
A) amphibian. B) invertebrate chordate. C) jawless fish. D) bony fish. E) cartilaginous fish.