Typhoid fever differs from salmonellosis in that in typhoid fever
A) the microorganisms multiply within macrophages.
B) the incubation period is much longer.
C) the symptoms are due to infection of the gallbladder.
D) infection is spread only in the feces of domesticated animals.
E) infection occurs due to ingestion of endospores.
B
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Activation energy is best described as ________
a. the difference in the energy level of the reactants and the energy level of the products b. the minimum amount of energy it takes to get a reaction started c. the proportion of the energy released by an endergonic reaction that can be captured by ATP d. the minimum amount of energy a reaction produces once it gets started
_____ are the closest protistan relatives of the fungi and animals
a. Stramenopiles c. Apicomplexans b. Radiolarians d. Amoebozoans
Birds and mammals share which characteristic?
a. ectothermy b. air pocketed bones c. bladders d. four-chambered heart e. three-chambered heart
The fossil record is usually derived from sedimentary rocks laid down millions of years ago.
a. true b. false