Antihistamines dampen the effect of allergic
reactions by
a. blocking the production of histamines.
b. blocking the release of histamines.
c. blocking the effect of histamines.
d. enzymatically destroying the histamines.
e. none of these
C
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You have discovered a new coccoid-shaped microorganism with no nucleus, a rigid cell wall, and a diameter of 2 µm. Chemical tests reveal that its cell wall does NOT contain peptidoglycan. The new microorganism is
A) most likely a bacterium. B) most likely a eukaryote. C) most likely an archaeon. D) either a bacterium or an archaeon.
Viroids
A. are naked (lacking a protein shell) pieces of RNA. B. are naked (lacking a protein shell) pieces of DNA. C. are known to cause neurodegenerative diseases in animals. D. are composed of protein encasing DNA. E. are known to cause neurodegenerative diseases in animals AND are composed of protein encasing DNA.
You are reviewing population pyramids of different countries for an exam. The pyramid of a particular country has a very high number of individuals in the post reproductive category (ages 40 and up) and very few individuals in the group below the age of 20. In which category would you put the country?
1.Declining. 2.Stable. 3.Increasing. 4.There is not enough information to determine the appropriate category.
All of the following pertain to virus envelopes except they
A. are gained as a virus leaves the host cell membrane. B. are located between the capsid and nucleic acid. C. contain special virus proteins. D. help the virus particle attach to host cells. E. are found primarily on animal viruses.