The entry of a pathogen into cells or tissues is known as
a. disease.
b. invasion.
c. virulence.
d. incursion.
e. infection.
E
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The genome of most prokaryotes consists of ____
a. a single linear DNA molecule b. a single circular DNA molecule c. many linear DNA molecules d. many circular DNA molecules e. a single DNA molecule that may be circular or linear, depending on the species
Caenorhabditis elegans is a nematode that scientists have shown grows from a single cell into about 1000 cells, of which the same 80 cells die during development through apoptosis. Studying this process in Caenorhabditis elegans has helped scientists identify the genes that regulate similar processes in humans. Which of the following statements is supported by this observation?
A. Caenorhabditis elegans have all of the same genes as humans. B. Caenorhabditis elegans give live birth like humans. C. Caenorhabditis elegans and humans have a common ancestor. D. Caenorhabditis elegans infections in humans trigger apoptosis. E. Caenorhabditis elegans has the same organs that are present in humans.
Which of the following human extraembryonic
membranes forms the urinary bladder? a. amnion b. yolk sac c. chorion d. allantois e. none of these
Given the problems related to fossilization listed in the text, which of these creatures would be least likely to be successfully fossilized?
A) turtle B) rose flower C) rhinoceros D) clam