A carnivorous plant, such as a sundew, may be considered both a ________ when it eats a carnivorous spider
A) primary consumer and a secondary consumer
B) producer and a secondary consumer
C) primary consumer and a tertiary consumer
D) producer and a primary consumer
E) producer and a tertiary consumer
E
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The female reproductive tract of some Drosophila species blocks sperm of another species from reaching her eggs
This is an example of ____.
a. gametic isolation b. hybrid breakdown c. hybrid inviability d. mechanical isolation e. temporal isolation
The peacock butterfly experiment demonstrated that ________
a. only spots had any measurable effect on the number of butterflies killed b. sound was more important than spots in butterfly defense against predatory birds c. spots were more important than sound in butterfly defense against predatory birds d. sound had no effect on the number of butterflies killed
In vertebrates, mechanoreceptors are not found in which of the following:
1.skin 2.skeletal muscles 3.walls of blood vessels 4.internal organs 5.all of these structures have mechanoreceptors
How can freeze-fracture be used to determine the orientation of a protein in a membrane?
A. Freeze-fracture cuts the membrane in protein-sized components for viewing under an electron microscope. B. Freeze-fracture allows a cell to be cleaved in such a way as to preserve the embedded proteins. C. Freeze-fracture allows a cell to be cleaved in between the lipid bilayer, splitting the plasma membrane into two layers.