Dmitri Ivanovski demonstrated that TMV was not spread via bacteria by
A. transmitting sap of infected plants from generation to generation.
B. filtering sap from an infected plant through pores smaller than bacteria, and then applying it to a healthy plant.
C. spraying sap from an infected plant onto a healthy plant.
D. sterilizing sap from an infected plant and then applying it to a healthy plant.
E. treating an infected plant with a broad spectrum of antibiotics before extracting sap.
B. filtering sap from an infected plant through pores smaller than bacteria, and then applying it to a healthy plant.
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During the Gram stain, the application of alcohol results in the decolorization of ______ cells.
A. gram-negative B. pleomorphic C. all D. gram-positive
When geese or ducks are imprinted, this means that they ____
a. will return to the place they were born to breed and raise their own young b. have become habituated to harmless stimuli c. have been experimentally trained by operant conditioning d. learned the features of a suitable mate during a critical period e. have two nonfunctional copies of a particular gene
Which of the following structures is considered to be the pacemaker of the heart?
a. atrioventricular node b. sinoatrial node c. atrioventricular bundle d. Purkinje fibers e. intercalated discs
_______ are able to breathe through their skins but only if the skin is kept damp.
a) lizards and snakes b) monotremes c) tetrapods d) frogs and toads