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.
B. catastrophism, as proposed by Cuvier.
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Which of the following is a possible human genotype that could result from nondisjunction of the sex chromosomes in one of the parental gametes?
A. XXY B. XYY C. XXX D. XO E. All of the answer options are correct.
Certain human cell types, such as skeletal muscle cells, have several nuclei per cell. Based on your understanding of
mitosis, how could this happen?
a. The cell undergoes repeated cytokinesis but not mitosis. b. The cell undergoes repeated mitotic divisions with concomitant cytokinesis. c. The cell undergoes repeated mitotic divisions but not cytokinesis. d. The cell undergoes anaphase twice before entering telophase. e. The cell goes through multiple S phases before entering mitosis.
In this chemical synapse, which structure represents the synaptic cleft?
a. A b. B c. C d. D e. E
A person with a normal total cholesterol level:
A) is at high risk for an acute cardiac event if his or her HDL levels are elevated. B) will probably not develop coronary artery disease, even if his or her HDL levels are low. C) will likely not experience an acute cardiac event, even if his or her LDL levels are elevated. D) is still at risk for coronary artery disease if his or her LDL levels are elevated.