Water has fewer hydrogen atoms than lemon juice and a pH of around 7. Predict what will happen to the pH level of water when lemon juice is added.
A. The pH will become higher.
B. The pH will become lower.
C. The pH will remain the same.
D. There is not enough information to decide.
B. The pH will become lower.
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True or false? _____ Mutations always result in negative effects on the organism. _____ Mutations are always large-scale (e.g., involving at least 10,000 base pairs of DNA)
DNA). _____ Mutations are never large-scale (e.g., involving at least 10,000 base pairs of DNA). _____ Most mutations are caused by an environmental pollutant. _____ Mutation rates are constant in all organisms. _____ Mutation rates are higher in men than in women because men have higher metabolic rates than women. _____ Mutation occurs every time a cell divides. _____ All mutations provide genetic variation on which evolution may act. What will be an ideal response?
Which of the following is not a polysaccharide?
A) extensin B) glycogen C) cellulose D) starch E) chitin
The main pollinators of flowers that have markings visible only under ultraviolet light are
A. birds. B. bees. C. beetles. D. flies. E. bats and moths.
The letter B” in the above figure represents its
a. shell. b. mantle. c. gills. d. siphon. e. none of these.