Iteroparity is common in which of the following organisms?
a. perennial herbaceous plants
b. most insects
c. agaves
d. most invertebrates
e. Pacific salmon
A
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Viruses that cause acute infection result in productive infections
Indicate whether this statement is true or false.
Molecular-based phylogies place the phylum Platyhelminthes in the Protostomia. How do scientists best explain the morphological differences between flatworms and the other members of the Lophotrochozoa?
A. Modern Platyhelminthes do not have a coelom but did originate from an ancestor that had one. B. The Platyhelminthes clade separated from other clades before coeloms evolved and consequently Platyhelminthes have never had a coelom. C. Platyhelminthes originated from ancestors with a coelom and have retained it to the present time. D. Platyhelminthes evolved from an ancestor without a coelom but developed one during the course of their evolution. E. Some Platyhelminthes have a coelom but others do not and it is difficult to conclude anything about its evolution within the clade.
When a person is tested for HIV, the test is considered positive if _______ to the HIV are present.
A. bacteria B. antigens C. antibodies D. T-cells E. natural killer cells
An agent that can cause birth defects is known as a(n)
a. teratogen. b. mutagen. c. carcinogen. d. haptene. e. allergen.