Energy is carried from the light reactions to the Calvin cycle by
A. water.
B. NADP+.
C. oxygen.
D. ATP.
E. CO2.
Answer: D
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Which of the following statements is not true of the amino acids?
A) There are more than 60 different kinds of amino acids present in cells. B) The R group of amino acids differs from one amino acid to another. C) Only around 20 amino acids are used in protein synthesis. D) All amino acids exist in two stereoisomeric forms. E) Amino acids have an N-terminus, C-terminus, and R groups.
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.
There is much controversy in the news—both scientific and popular—about the use of embryonic stem cells for research. These cells are grown as cell lines in culture, created by taking the inner cell mass from 5-day-old embryos
What is the center of the controversy? A) the fact that the embryos are mostly those unused by in vitro clinics B) the knowledge that these cell lines have reverted spinal cord injuries in mice C) the unproven usefulness of stem cells to treat human disorders D) the realization that these cells are pluripotent rather than totipotent E) the difference of opinion about whether these embryos are persons
Which of the following is NOT true about ecosystems?
What will be an ideal response?