Which of the following is reported to cause deformities in amphibians in the Sierra Nevadas of California?
a. pesticides
b. pollution
c. trematodes
d. atrazine
e. predators
a
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Which of the following statements about the effects of deforestation on terrestrial ecosystems are true? Check all that apply.
_____ At present rates of deforestation, it is predicted that all of the world's tropical rain forests will be degraded or gone within 10 years. _____ Today, deforestation is one of the greatest problems facing terrestrial ecosystems. _____ Deforestation usually leads to the over-accumulation of nutrients such as nitrates/nitrites in the soil. _____ Deforestation can lead to loss of topsoil. _____ Deforestation can lead to eutrophication of aquatic ecosystems.
Which of the following would be correctly classified as a protein?
A) cholesterol B) starch C) an enzyme D) cellulose
The current rate of extinction may be as much as ________ times greater than the natural rate of extinction
A) 10 B) 100 C) 1,000 D) 10,000
snRNAs ___________________
(a) are translated into snRNPs. (b) are important for producing mature mRNA transcripts in bacteria. (c) are removed by the spliceosome during RNA splicing. (d) can bind to specific sequences at intron–exon boundaries through complementary base-pairing.