American alligators are living members of the ____ lineage
a. Testudines
b. Archosauria
c. Squamata
d. Sphenodontida
e. Amphibia
ANSWER: b
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Unique sequences make up approximately what percent of the human genome?
A. 5% B. 25% C. 40% D. 80%
Which of the following is the main reason why pollen withstands decay much better than typical plant
parts?
a. hemicellulose b. sporopollenin c. lignin d. cellulose e. pectin
_____ corrects the genetic defect in an individual with a genetic disorder by _____
a. Enzyme replacement therapy; delivery of a normal gene to affected cells in the body b. PGD; removing affected cells from an early stage embryo c. Gene therapy; PGD d. Gene therapy; delivery of a normal gene to affected cells in the body e. Chorionic villus sampling; constructing karyotypes from affected cells
Which of the following is true during a typical cAMP-type signal transduction event?
A) The second messenger is the last part of the system to be activated. B) The hormone activates the second messenger by directly binding to it. C) The second messenger amplifies the hormonal response by attracting more hormones to the cell being affected. D) Adenylyl cyclase is activated after the hormone binds to the cell and before phosphorylation of proteins occurs.