The "universal" genetic code is now known to have exceptions. Evidence for this can be found if which of the following is true?
A) if UGA, usually a stop codon, is found to code for an amino acid such as tryptophan (usually coded for by UGG only) in a different organism
B) if one stop codon, such as UGA, is found to have a different effect on translation than another stop codon, such as UAA
C) if prokaryotic organisms are able to translate a eukaryotic mRNA and produce the same polypeptide
D) if several codons are found to translate to the same amino acid, such as serine
E) if a single mRNA molecule is found to translate to more than one polypeptide when there are two or more AUG sites
Answer: A
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What is the primary goal of conservation biology?
A. balance the needs of the human population against the rest of the species on Earth B. management of the Earth's biodiversity C. discovery of new sources of food and medicines D. preservation of crucial habitat for the benefit of multiple species E. identify the most endangered and threatened species so efforts can be made to protect them
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Which of the following assumptions or observations is not part of Darwin's idea of natural selection?
A) Whether an organism survives and reproduces is almost entirely a matter of random chance. B) Heritable traits that promote successful reproduction should gradually become more common in a population. C) Populations produce more offspring than their environment can support. D) Organisms compete for limited resources.
It is possible to make a form of nitrogen that is useable by plants; however, the major drawback to this process is
A. cost of converting nitrogen to a useable form. B. getting enough nitrogen. C. it is difficult to contain the end product. D. time involved. E. temperatures must be extremely high.