The photosynthetic pigments of Heliobacterium and Heliophilum ________.
A. are in separate membrane structures that are not attached to the plasma membrane
B. are in the plasma membrane and not in separate structures
C. are in separate structures and also in the plasma membrane
D. are in separate membrane structures attached to the plasma membrane
Answer: B
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After Darwin concluded his voyage on the Beagle, he proposed that the process of natural selection was a mechanism for:
A. overpopulation of finches on the Galapagos Islands. B. speciation. C. artificial selection. D. sexual selection. E. evolution.
Answer the following statements true (T) or false (F)
1. The use of fossil fuels has increased the available resources for populations around the world, contributing to the exponential growth rate of the human population. 2. Developing countries are less likely to agree on a global climate change treaty because they might fear that it will slow their economic growth. 3. Population sizes of predators and their prey in a community are constant over time. 4. Pioneer species make up the climax community of a given ecosystem. 5. The main source of water in streams is replenished from groundwater.
Myelin speeds the conduction of action potentials along a neuron by
A) lowering the threshold at which action potentials are generated. B) allowing the action potential to "jump" over sections of the axon. C) inserting additional voltage-gated K+ channels into the membrane. D) increasing the resting membrane potential. E) increasing the diameter of the axon.
An important function of nomenclature is to
A) facilitate unambiguous communication. B) clarify relationships among organisms. C) provide an understanding of evolutionary relationships. D) define the characteristics used for classification. E) provide a detailed description of an organism.