Before vaccines became available, infections by the bacterium Clostridium ________ often resulted in skeletal muscles spasms and paralysis of respiratory and cardiac muscle
a. perfringens
b. difficile
c. botulinum
d. tetani
d
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Submerged aquatic plants typically have stomata
Indicate whether the statement is true or false
Discuss the biological effects of the following types of drugs: hallucinogens, stimulants, and anti-anxiety drugs. What will be an ideal response?
If you live on a river delta or coastline, you may not be able to eat the local shellfish because of high levels of toxins, even though you may be able to drink the water taken from the same source. Why?
A. Shellfish filter-feed and concentrate the dilute pollutants from the water, thus acting as early warning indicators of severe pollution. B. Shellfish regularly consume poisonous red tide organisms. C. Shellfish seasonally produce toxic substances. D. Most harmless native clams have been replaced by bad species.
Which protein classes are not found as membrane proteins?
A. identity markers B. receptors C. enzymes D. transport channels E. hormones