To cause actual damage to a host, a microbe must:
a. produce toxins that destroy tissue
b. induce an injurious immune response
c. evade immune system responses
d. utilize a portal of exit
a. produce toxins that destroy tissue
b. induce an injurious immune response
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The carrying capacity for a specific population remains constant
a. True, this represents the number of individuals that the environment can support. b. False, this does not represent the total number of individuals that an environment can support. c. True, each year some organisms die and others are produced. d. False, habitats and environments are not constant, unchanging entities
When caught early, breast cancer is often treated by
1.lumpectomy. 2.modified radical mastectomy. 3.radical mastectomy. 4.chemotherapy, alone. 5.radiation therapy, alone.
A digestive system involving a(n) tube-within-a-tube is characteristic of Cnidarians. Indicate whether the statement is true or false
The first class of drugs developed to treat AIDS, such as AZT, were known as reverse transcriptase inhibitors. They worked because they _____
A) targeted and destroyed the viral genome before it could be reverse transcribed into DNA B) bonded to the dsDNA genome of the virus in such a way that it could not separate for replication to occur C) bonded to the viral reverse transcriptase enzyme, thus preventing the virus from making a DNA copy of its RNA genome D) prevented host cells from producing the enzymes used by the virus to replicate its genome