Refer to Figure 40-4. In which part of the cell are calcium ions stored?
a. 2
b. 3
c. 4
d. 5
e. 6 What will be an ideal response?
B
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Which example shows nonevolutionary change in a population?
A) an increase in mosquitoes that are resistant to insecticide B) plants in a dry climate that have faster-growing roots than plants found there 20 years ago C) after decreases in airborne soot, a change in the most common color of moths D) an increase in the number of people diagnosed with colon cancer
Which example is most clearly a case of density-dependent population regulation?
A) the summer drying of savanna grass for an insect that feeds on grass sap B) a dangerous new flu strain that is transmitted among humans by sneezing C) the first hard frost of fall for a population of annual morning glory vines D) the occurrence of rainstorms for an opportunistic desert annual
True or False: Helicobacter pylori, when present, is the MOST common single organism found in the stomach
a. TRUE b. FALSE
Suppose that a DNA change results in the substitution of one codon for another, and the new codon specifies a different amino acid from the original. What type of mutation has occurred?
a. a chromosomal mutation b. a missense mutation c. a frameshift mutation d. a silent mutation