The third wave of environmental policy in the U.S. was triggered in part by the publication of Rachel Carson's Silent Spring and the burning of the Cuyahoga River. This wave is characterized by a focus on _________________.
A. protecting wild spaces and the creation of National Parks
B. pollution problems
C. global sustainability
D. energy efficiency
E. westward expansion and exploitation of natural resources
Ans: B. pollution problems
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E. All the choices are correct.
A. H2 B. H2O C. CH4 D. O2 E. H
Does the presence of introns/exons in eukaryotic cells provide more potential diversity in gene products (proteins) than is possible in prokaryotic cells?
A. It doesn't-this is a trick question. There's the same potential for gene products (proteins) in a bacterium with 1,000 genes as there is in a eukaryotic cell with 1,000 genes. B. It does-each exon and each intron could be used individually and discretely to make agene product (protein). Since bacteria lack these, they will have less ability to create different proteins. C. It does-exons/introns can be spliced together in different ways post-transcription to yield different mRNAs (and therefore, different proteins). Bacteria lack this system, so the gene you transcribe is translated into the only protein you'll end up getting. D. It does-exons/introns can be spliced together in different ways at the DNA levelto eventually yield different mRNAs (and therefore, different proteins). Bacteria lack this system, so the gene you transcribe is translated into the only protein you'll end up getting.
Trace the correct path in the endomembrane followed by a protein, beginning with its site of synthesis in the rough
ER.
a. rough ER ® smooth ER ® Golgi complex ® plasma membrane b. rough ER ® Golgi complex ® vesicle ® plasma membrane c. rough ER ® vesicle ® lysosome ® plasma membrane d. rough ER ® vesicle ® smooth ER ® plasma membrane e. rough ER ® smooth ER ® lysosome ® plasma membrane
A newly-generated T cell can recognize MHCs and is not self-reactive. What is its fate?
A) It is signaled for destruction via apoptosis. B) It will migrate to the lymphoid tissues to await activation by its antigen. C) It will undergo genetic shuffling to change its receptor to increase self-tolerance. D) It will become part of an autoimmune attack in the body's tissues at some time in the future. E) It will migrate to the bone marrow for screening for the ability to make antibodies against self-antigens.