Which of the following are found in the nucleus of an atom?
A) electrons and neutrons
B) neutrons and protons
C) protons and electrons
D) neutrons, electrons, and protons
B
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The loss of mayflies from a stream suggests that the quality of water is declining; therefore, mayflies are a(n) ____ species.
a. degraded b. endangered c. threatened d. keystone e. indicator
In which example are the proximate cause and the ultimate cause of morphological evolution correctly matched?
A. Proximate: point mutations in protein coding genes affect protein function and structure, ultimate: chemical and physical configuration of a protein affect its function B. Proximate: cis-regulatory elements are found upstream of a gene; ultimate: cis regulation is required to activate a gene C. Proximate: natural selection causes morphology to differ among species, ultimate: natural selection prevents morphological variation within a species D. Proximate: changes in gene regulation lead to changes in morphology; ultimate: natural selection favors morphologies that work best in their environment E. Proximate: natural selection favors gene combinations that have high fitness in their environment; ultimate: genetic changes alter morphology and fitness
Spirochetes have a twisting and flexing locomotion due to appendages called
A. periplasmic flagella (axial filaments). B. sex pili. C. cilia. D. flagella. E. fimbriae.
Which of the following statements is true?
A) The temperate deciduous forest is composed of a high diversity of deciduous trees that lose their leaves in the fall because of low soil fertility. B) Agriculture is often not very successful in grasslands because of the poor soils. C) The high species diversity of a tropical rain forest is supported by a high diversity of soil organisms, high soil fertility, and high rainfall. D) Agriculture is often not very successful in a tropical forest because of the poor soils.