A single eukaryotic gene can produce two different forms of a protein, one that is membrane bound and one that is secreted. Which of these mechanisms allows a single gene to produce two different proteins from one primary transcript?
A) alternative splicing
B) gene divergence
C) gene duplication
D) exon shuffling
E) gene rearrangement
A) alternative splicing
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Some cytoskeletal elements are more permanent than others. Which components of the cytoskeleton are dynamic structures?
A. microtubules B. microfilaments C. intermediate filaments D. both microtubules and intermediate filaments E. both microtubules and microfilaments
One reason that atrazine, an herbicide in use for more than 40 years, is an environmental problem is that it ____
a. raises the level of air pollution b. poses a substantial contribution to greenhouse gases c. disrupts the stratospheric ozone level d. is responsible for the extinction of bee colonies e. is an endocrine disrupter and can reduce reproductive capacity in aquatic animals
Which of the following is not a category of symbiosis?
A. Parasitism B. Mutualism C. Commensalism D. Communalism
Which of the following particles are found in the nucleus of an atom?
A) protons and neutrons B) protons and electrons C) neutrons and electrons D) neutrons, electrons, and protons