For a plant to initiate chemical responses to herbivory, before it is directly affected by herbivores, _____
A) a plant must have already flowered at least once
B) volatile "signal" compounds must be perceived
C) gene-for-gene intraspecific recognition must occur
D) phytoalexins must be released
B
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Activated sludge is used in which sewage treatment step?
A. Secondary B. Tertiary C. Primary D. All of these choices are correct.
In 1979, a group at Cambridge discovered that in human mitochondria, UGA is not a stop codon but instead during translation results in the delivery of the amino acid tryptophan
It was extremely unexpected to discover that one organism could have two different genetic codes, and that the genetic code was not universal—it is mostly or nearly universal. The evolutionary history of the genetic code is an area of robust debate. Which of the following statements about the evolution of the genetic code is most likely true? A. There is no chemical correspondence between codons and amino acids—the code is arbitrary in its origin. B. The presence of genetic code alternatives directly challengesthe concept of a common ancestor for humansand E.coli. C. Life arose twice as independent events. D. The genetic code has a small number of alternative states but these differences cannot be used like nucleotide differences in the genome to infer phylogenies (relationships).
What Takes Place During Anaphase I? - homologous pair - # of chromosomes - sister chromatids
What will be an ideal response?
What is a hypothesis?
A. A report of the findings of scientific experiments B. A specific conclusion of an experiment in an "if … then" format C. A way of using isolated facts to reach a general idea that may explain a phenomenon D. The summary of the outcomes of scientific findings E. A testable explanation of a natural phenomenon