Which of the following statements is TRUE?
A) Heroin binds to endorphin receptors.
B) Caffeine increases the effects of neurotransmitters that normally suppress nerve signals.
C) Alcohol is a stimulant.
D) Nicotine is a depressant.
A
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Which of the following mechanisms may be responsible for the occurrance of exon shuffling?
A. double crossover could promote the insertion of an exon into another gene. B. nonhomologous recombination. C. transposable elements may promote the movement of exons. D. both nonhomologous recombination and transposable elements. E. none of these are mechanisms responsible for exon shuffling.
Which of the following situations in not an example of directional selection? a. Peppered moths in England
b. All of these are examples of directional selection. c. Rock pocket mice in Arizona. d. Antibiotic resistance in bacteria. e. None of these are examples of directional selection.
Which of the following arose first?
a. animals b. archaea c. fungi d. protists e. plants
Four of the five groups listed below have single-celled members. Select the exception
a. brown algae b. dinoflagellates c. green algae d. diatoms e. red algae