Phenotypes that show a wide range of almost continuous variation, such as height or skin color in humans, are probably:
A) due to both alleles of one gene working together.
B) acquired characteristics.
C) dominant.
D) due to several sets of alleles working together.
Answer: D
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The main effect of burning peat, wood, coal, and petroleum on the Earth's climate is:
A. The fires significantly heat the air and cause a rise in global temperature. B. The smoke blocks sunlight from reaching the Earth and causes a significant lowering of the Earth's temperature. C. The fires release back into the atmosphere carbon dioxide that was once taken from the atmosphere by plants and stored in their own tissues; the increased carbon dioxide holds in solar heat and causes a rise in temperature. D. The rising heat from fires produces wind that cools the surface of the Earth. E. The fires use up oxygen that would otherwise block penetration of ultraviolet light from reaching the Earth; the increased ultraviolet radiation heats the Earth.
In temperate deciduous forest, light penetration to the ground is greater during summer than during winter
Indicate whether the statement is true or false
During the formation of an embryo, the hollow ball of cells having a fluid-filled cavity is called a
A. neurula. B. blastula. C. gastrula. D. blastocoel. E. morula.
Pain receptors are activated by tissue damage, but pain perception requires intact, functional neurons. How does this work?
A. The nociceptor neuron only sends action potentials as it is dying. B. The neuron itself does not need to be damaged; it responds to signals released by nearby damaged cells. C. Nociceptor neurons have special membrane repair mechanisms. D. The axon continues to fire action potentials despite damage to the cell body.