Which of the following characteristics of a medicine might be effective in treating a herpes simplex (a virus, not a bacteria) infection with as little harm to the patient as possible?
A) blocking cell wall synthesis
B) stopping cilia activity
C) preventing capsid formation
D) halting membrane formation
C
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Cnidarians share a common body plan that takes two forms. The free-floating form is called a ____ , whereas the sessile form is called a ____
Fill in the blank with the appropriate word.
Kinases and phosphatases are essential in the cell because they
A) help turn proteins "on and off" through changes in phosphorylation status. B) are enzymes that destroy damaged proteins. C) sense short poly-A tails in mRNA as a signal to degrade the mRNA. D) destroy second messengers, thereby turning off a signal transduction pathway. E) all of the above
All species on Earth today are descended from a cell that lived as early as:
a. 4 billion years ago. b. 570 million years ago. c. more than 5 billion years ago. d. more than 10 billions years ago. e. 1.4 billion years ago.
The ____ a photon’s wavelength, the ____ its energy
a. shorter; greater b. longer; greater c. shorter; less d. longer; more variable e. shorter; more variable