Which of the following statements regarding schistosomiasis is incorrect?
A. Once a person has recovered from an infection with Schistosoma mansoni, they are protected with lifelong immunity.
B. Schistosomiasis is transmitted by exposing the skin to a water source that has been contaminated with sewage.
C. There is only a single drug available to treat Schistosoma infection, praziquantel, and drug-resistant strains are beginning to arise.
D. Efficacy of treatment is assess by observing fecal samples placed in water for whether eggs can hatch to release live miracidia.
Answer: A
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Radiometric dating shows that Archaeopteryx lived
__________ million years ago. a. 50 b. 150 c. 250 d. 350 e. 450
DNA sequencing data suggest that evolutionary changes are related to an accumulation of:
a. changes in DNA nucleotide sequences. b. homologous structures. c. index fossils. d. vestigial organs. e. convergent structures.
Activation energy is similar to the "push" needed to start rolling a stalled car down a hill. How do enzymes fit into this analogy?
A) Enzymes increase the effort that's needed to start the car moving. B) Enzymes decrease the effort that's needed to start the car moving. C) Enzymes add a roadblock on the hill that the car will roll down. D) Enzymes decrease the size and shape of the car that needs to be moved.
Which of the following is required for transposition?
A) F+ plasmid B) bacteriophage C) insertion sequence D) donor cell E) competence