Respiratory proteins such as hemoglobin _____
a. contain metal ions
b. occur only in vertebrates
c. increase the efficiency of oxygen transport
d. both contain metal ions and increase the efficiency of oxygen transport
D
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If species are competing for the same resource, one species is likely to go extinct through competitive exclusion, or natural selection will drive the evolution of
A. prezygotic isolating mechanisms. B. hybrids. C. character displacement. D. polyploid individuals.
In your Ph.D. research, you use thin slices of brain tissue to study neuronal signaling. You attach an electrode to a single neuron, but cannot detect any activity. What is the most likely explanation?
A. Neurons are not electrically active; you should be recording neuroglia instead. B. Excessive myelination is blocking inputs to the cell. C. When you sliced the brain, you disconnected the cell from its dendrites. D. When you sliced the brain, you disconnected the cell from its neuroglia.
Closer observation reveals that these small spheres are produced on tiny extensions of the stem, each of which helps compose the strobilus. These small, spore-producing extensions of the stem are called
A) scales B) sporangia C) sporophylls D) gametangia
True or False: Microbiomes are found only within the body of a host, which may be animal, plant, fungal, or even protist.
Answer the following statement true (T) or false (F)