Which microscope uses two beams of light to produce a three-dimensional color image?
A) fluorescence microscope
B) phase-contrast microscope
C) darkfield microscope
D) DIC microscope
E) electron microscope
D
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Beetle pollinators of a particular plant are attracted to its flowers' bright orange color. The beetles not only pollinate the flowers, but they mate while inside of the flowers. A mutant version of the plant with red flowers becomes more common with the passage of time. A particular variant of the beetle prefers the red flowers to the orange flowers. Over time, these two beetle variants diverge from each other to such an extent that interbreeding is no longer possible. What kind of speciation has occurred in this example, and what has driven it?
A) allopatric speciation; ecological isolation B) sympatric speciation; habitat differentiation C) allopatric speciation; behavioral isolation D) sympatric speciation; sexual selection E) sympatric speciation; allopolyploidy
In positive feedback homeostatic mechanisms
(a) the response reverses the change. (b) the response intensifies the change. (c) the response occurs before the change. (d) none of the above answers occurs.
An area where two bones meet is called a
A. synapse. B. joint. C. synaptic cleft. D. vascular cavity. E. olfactory bulb.
Antigen bearing particles in the blood travel to the ____, while those in solid tissues travel to the ____
a. spleen; bone marrow b. thymus; bone marrow c. spleen; lymph nodes d. lymph nodes; spleen e. bone marrow; thymus