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?
What will be an ideal response?
This question asked you to apply the properties of water to explain why oil and water do not mix
well. If you got the correct answer, great job! If you got an incorrect answer, where did the process break
down? Did you know what the word hydrophobic meant? Did you have difficulty remembering which
properties of water make it a good solvent for other polar molecules?
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In the Breathalyzer, ___ ethyl alcohol molecules react with ___ potassium dichromate molecules.
Fill in the blank(s) with the appropriate word(s).
A somatic mutation
A) occurs only in microbes. B) affects a particular subset of cells. C) affects all cells of an individual. D) is expressed only in embryos.
Regarding the nature of natural selection, which of the following is NOT an accurate statement?
A) Populations evolve traits by natural selection that will be useful for future environmental changes. B) Natural selection acts on the phenotypes of individuals, but evolution occurs with changes in allele frequencies in populations. C) Natural selection can and does produce features that are less than perfect adaptations. D) Natural selection operates as a systematic, nonprogressive mechanism.
The lactose operon is likely to be transcribed when _____
A) there is more glucose in the cell than lactose B) there is glucose but no lactose in the cell C) the cyclic AMP and lactose levels are both high within the cell D) the cAMP level is high and the lactose level is low