Which of the following is the term for the chemical reactant to which an enzyme binds?
a. Catalyst
b. Substrate
c. Active site
d. Lock-and-key
b. Substrate
The chemical reactant to which an enzyme binds is called a substrate.
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Which type of epithelium is found in the inner lining of blood vessels?
a. simple squamous epithelium b. stratified squamous epithelium c. cuboidal epithelium d. simple columnar epithelium e. simple pseudostratified columnar epithelium
Estuaries in which river flow is strong and prevents the flow of seawater upstream are called:
a. fjords. b. salt-wedge estuaries. c. well-mixed estuaries. d. tectonic estuaries. e. drowned river valleys.
What is the best definition for the FISH technique?
A) A method to fluorescently label different genes on metaphase chromosomes. B) A method to fluorescently label methylated histones associated with chromosomes. C) A method to fluorescently label heterochromatin. D) A method to fluorescently label euchromatin.
The broadleaved deciduous forests of eastern North America contain many species of trees. Which of the following statements best describes the geographic distributions of these species?
A) Groups of species found in any part of this region have very similar distributions. B) Each species occupies a small geographic area from which all other species are excluded. C) Each species has a different geographic range, but these ranges overlap to some extent. D) none of the above