17. Active transport, facilitated diffusion and osmosis all require the expendit
ID: 93282 • Letter: 1
Question
17. Active transport, facilitated diffusion and osmosis all require the expenditure of metabolic energy.True or False
18.Living cells cannot be viewed under an electron microsscope. True or False
19.The shape of a ligand and the shape of its binding site influence both the specificity and the affinity of binding. True or False
20.An antagonist blocks the action of a chemical messenger by binding to its receptor. True or False
21. Activated calmodium can activate or inactivate certain cytosolic enzymes. True or False
22.Denaturation of a protein is always permanent. True or False
23. As the Concentration of substrate increases, the activity of the enzyme decreases. True or False
24. Ribozymes are enzymes that cleave the subunits of the of the ribosome. True or False
25. Anaplerotic reactions replenish TCA intermediates. True or False
26. Flippases move phospholipids from one membrane leaflet to the opposite leaflet. True or False
NOTE: PLEASE THE ABOVE QUESTIONS ONLY REQUIRE TRUE OR FALSE AS THE ANSWER. WHICH QUESTIONS ARE TRUE AND WHICH ONES ARE FALSE
Explanation / Answer
Answer 17: FALSE (As explained below)
Only active transport requires metabolic energy in the form of ATP. Facilitated diffusion and osmosis do not require energy; they are powered by the potential energy of the concentration gradient.
Answer 18: FALSE (As explained below)
Electron microscope requires the specimen to be placed in vacuum. But living cells cannot survive in vacuum. So, electron microscope cannot be used to view living cells.
Answer 19: TRUE (As explained below)
For a target protein to bind, its shape must be complementary to the shape of the binding site and the shape of a ligand, much like a lock-and-key arrangement.
Answer 20: TRUE (As explained below)
By definition, antagonists are substances that prevent agonist from binding by binding to the receptors.
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