The notion that organisms have hierarchical levels of structure refers to their
Ans: Organization
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Bacterial infections have become much more of a threat to human health due to
A. the increased use of antibiotics. B. an increase in acquired antibiotic resistance by innocuous strains. C. horizontal transfer of pathogenicity. D. both an increased use of antibiotics and an increase in acquired antibiotic resistance by innocuous strains. E. All of the events given have increased the threat of bacterial infections.
What best explains why some organisms
‘breed true” for certain traits?
a. they have identical alleles for these traits b. their parents had the same phenotype c. both alleles for the trait are on the same chromosome d. their genotypes match their phenotypes e. they are heterozygous for these traits
Why is it unlikely that we will find fossils of
every extinct species?
a. Most dead organisms are eaten by scavengers. b. Organic remains decompose. c. Not all species have hard parts like bones or teeth. d. Most fossils are buried too deep for us to find. e. More than one of these is correct
A study of a cohort of 1,000 animals showed a 90
percent death rate per individual in the first year, 10 percent the second year, and 5 percent the third year. This population’s survivorship is a. type I. b. type II. c. type III. d. type I the first year and type II in years two and three. e. type I the first year, type II the second year, and type III the third year.