The current rate of extinctions is about ____
times faster than normal.
a. 10
b. 100
c. 1000
d. 100, 000
e. 1, 000, 000
C
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A human population living without medical care in a developing country would probably have ____
a. a rectangle-shaped age structure diagram b. an r value < 0 c. a pyramid-shaped age structure diagram d. per capita birth and death rates consistent with those of a stage 4 society e. no density-dependent factors operating
By using mice, researchers found a correlation between mutations in the gene APOA5 and ____
a. high triglycerides in blood b. breast cancer c. receptors of the immune system d. sickle-cell anemia e. Alzheimer’s disease
Garrod first proposed that:a
metabolic defects were due to the lack of an enzyme. b. metabolic defects were due to excess enzyme production. c. metabolic defects were due to chromosomal changes. d. mutations were heritable. e. metabolic defects did not occur in humans.
Which statement best describes the relationship that exists among proteins, DNA, and cells?
a. Proteins combine to produce cells, which produce DNA b. Proteins are made up of DNA, which determines the cells that are produced. c. DNA is made up of proteins, which tell a cell how to function. d. Cells contain DNA, which controls the production of proteins.