Bees are currently suffering from disease, and population numbers are decreasing. What is a likely consequence for flowers if this continues?
1.There would be no need for stamens for pollination, so flowers would evolve with just carpels.
2.Other insects would take over the role of pollination for the plant.
3.Plants could go extinct if there isn’t any pollination by other organisms.
4.The plant would be forced to rely on wind for pollination.
3
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On a biology field trip near campus you observe layers of volcanic rock, eroded mountain rocks, and even rocks apparently formed near an ocean coast. You notice that fossils found within the different rock layers have diverse body forms as a result of their environment. This set of observations tends to support
A. limits to the fossil organism populations, as proposed by Malthus. B. catastrophism, as proposed by Cuvier. C. uniformitarianism, as proposed by Hutton. D. uniformitarianism, as proposed by Lyell. E. microevolution of the organisms, as the environment changed.
Matter and energy flow through the biosphere. The flow of matter, however, differs from the flow of energy. Which of the following statements accurately describes these differences?
A) Matter flows in cycles, whereas energy flows in one direction. B) Matter does not accompany energy as it enters the biosphere, but it does flow with energy from the biosphere. C) Energy flows from chemotrophs to phototrophs, whereas matter flows from phototrophs to chemotrophs. D) Energy flows as organic molecules are reduced to inorganic molecules, but matter does not. E) Matter and energy flow sometimes in cycles and sometimes unidirectionally.
An essential amino acid is one that:a
can only be obtained by eating plant and not animal protein. b. is absolutely required in large quantities for the body to function. c. is required in amounts of less than 100 milligrams per day. d. must be converted to glucose in the liver. e. cannot be made by the body, so it must be supplied in the diet.
Choose the phrase that describes MHC class I molecules.
A. Are proteins involved in the complement system B. Found on only some types of white blood cells C. Expressed on all human nucleated cells D. Are secreted from all human nucleated cells