If a hybrid is unable to produce sperm because meiosis does not proceed correctly, gene flow between the populations is restricted by:
A) temporal isolation. B) hybrid infertility.
C) gametic isolation. D) ecological isolation.
Answer: B
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All proinflammatory cytokines EXCEPT ________ induce fever at the systemic level
A) IL-4 B) IL-12 C) IL-6 D) IL-17
Cellular division within the eukaryotic cells requires DNA to condense into the:
A. 30-nm chromatin fiber. B. 1400-nm chromatin fiber. C. 300-nm chromatin fiber. D. 2-nm chromatin fiber. E. 44-nm chromatin fiber.
Excitatory postsynaptic potentials (EPSPs) produced nearly simultaneously by different synapses on the same postsynaptic neuron can also add together, creating _____
A) a temporal summation B) a spatial summation C) a tetanus D) the refractory state
Carrot sticks that are left in a dish of freshwater for several hours become stiff and hard. Similar sticks left in a saltwater solution become limp and soft. From this we can deduce that the freshwater is ______ and the saltwater is ________ to the cells of the carrot sticks.
A. hypotonic, hypertonic B. hypotonic, hypotonic C. hypertonic, hypotonic D. hypertonic, hypertonic