One line of evidence that humans arose in Africa is the observation that Africans have
A. the most diverse mitochondrial DNA sequences.
B. rRNA sequences that place them in the domain Archaea.
C. fewer genes.
D. slower molecular clocks.
E. the most diverse nuclear DNA sequences.
A. the most diverse mitochondrial DNA sequences.
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In the reaction catalyzed by aconitase, the conversion of citrate to isocitrate is inhibited by fluoroacetate. Fluoroacetate is used as a pesticide. Why is this an effective pesticide?
A. It inhibits glycolysis B. It inhibits pyruvate oxidation C. It inhibits the Krebs cycle D. It inhibits the electron transport chain E. It inhibits ATP synthase Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about cellular respiration and when citrate is converted to isocitrate? What other information is related to the question? Choose Answer Do you have all necessary information to determine why fluoroacetate is an effective pesticide? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In peripheral countries, a greater percentage of the labor force is engaged in primary and secondary activities than in tertiary and quaternary activities
Indicate whether this statement is true or false.
Side chains are important to proteins because they
A. help determine protein shape. B. help determine the degree of solubility of the protein in water. C. are a source of energy for hydration reactions in the cell. D. form the peptide bonds that link amino acids to one another. E. help determine protein shape AND help determine the degree of solubility of the protein in water.
On the Galápagos Islands, the amazing tool-using "woodpecker finch" can modify twigs to pry out grubs. Because there are no true woodpeckers on the Galápagos Islands, this behavior allows this finch to exploit an untapped food source. However, not all members of this species exhibit this behavior, which is probably learned from watching other finches. Therefore,
A. there must be a great advantage to reaching this food source for this learned behavior to be repeated by most descendants of each generation. B. young chicks isolated at hatching will not know how to do this. C. it is probably not "hardwired" in the brain as a behavior passed on genetically. D. All of the choices are correct.