Describe two ways that the formation of a double helical region between an RNA regulator and its target can affect the target
What will be an ideal response?
Ans: Formation of a double helical region may protect the target from protein binding or it may have the opposite effect. Duplex formation may also prevent the target from adopting a particular secondary structure.
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A key is placed into a keyhole then turned and the door opens. Which of the following components of cell signaling would best correspond to the keyhole?
A. the hormone B. the receptor C. conformational change in the receptor once bound to the hormone D. signal transduction E. the cell response
Why does a phospholipid on the cytoplasmic side of the cell membrane rarely flip to the extracellular side if both environments are polar?
a. The cholesterol does not allow lipids to move. b. The polar head group cannot pass through the nonpolar interior. c. The two sides have different functions and thus the phospholipid would not function properly. d. The cytoplasmic phospholipid is too big to pass through the membrane.
Nearly all viruses are constructed of
A. RNA with a protein wrapping, called a capsid. B. DNA with a protein wrapping, called a capsid. C. either DNA or RNA with a protein wrapping, called a capsid. D. either DNA or RNA, however many do not have the capsid.
When bacteria appear in tissues, a type of large cell engulfs and destroys them. Which process are these cells using to engulf the bacteria?
A) phagocytosis B) pinocytosis C) active transport D) exocytosis