1. Select the best word to complete the paragraph. Found in both prokaryotes and
ID: 57924 • Letter: 1
Question
1. Select the best word to complete the paragraph.
Found in both prokaryotes and eukaryotes, compartmentalization of the cytoplasm is more common in _________ cells. Options: Prokaryotic, eukaryotic
Compartmentalization is achieved when ________ subdivide the cytoplasm into regions of distinct chemical environments. Options: higher, eukaryotic, prokaryotic, lower, proteins, membrane
For example, the lysosome is a compartment in which the pH is much _____ than that of the cytoplasm.
Options: Higher, lower
2.
What is the most likely role of a cell that contains a large ammount of rough ER?
Select one:
a. It synthesizes large quantities of lipids (membranes).
b. It produces large ammounts of ATP for neighboring cells.
c. It is involved in energy storage.
d. It actively exports proteins.
3.
From the list below select ALL that are true of the prokaryotic nucleoid. (You MAY select more than one answer.)
Select one or more:
a. Special protein "pores" are the only way to anter or exit the nucleoid.
b. Contains linear DNA
c. Border is defined by a phospholipid bilayer.
d. Contains circular DNA
4.
Chose the answer from the list below that BEST explains the relationship between conformation and enzyme activity.
Select one:
a. Only the primary structure (amino acid sequence) of the enzyme is essential for that enzyme to catalyze a reaction. Secondary and tertiary structure are not critical for enzyme function.
b. Denatured enzymes can still catalyze chemical reactions suggesting that conformation is not important for enzyme function.
c. The active site of the substrate must have a precise conformation so that the enzyme can interact with it to catalyze a reaction.
d. Conformation of the enzyme is essential to it's function because there is a highly specific interaction between the enzyme and substrate in the active site.
5.
Select all of the answer from the list below that are true of an allosteric inhibitor. You may select more than one answer.
Select one or more:
a. Allosteric inhibitors compete with the enzyme substrate for binding in the active site.
b. Allosteric inhibitors decrease the rate of an enzyme-catalyzed reaction.
c. Allosteric inhibitors induce a permanent conformational change in the enzymes with which they interact.
d. Phosphoylation (addition of a phosphate group) is an example of allosteric inhibition.
6.
Select all the true statements from below regarding coupled reaction. You may select more than one answer.
Select one or more:
a. The reaction ADP + Pi ---> ATP is an example of coupling.
(Note: Pi represents a phosphate group (PO4-))
b. Coupling involves two different reaction taking place at the same time and place.
c. Coupling can provide the energy to drive an endergonic reaction.
d. Coupling occurs in cells in the presence and the absence of enzymes, but coupling tends to be more efficient when an enzyme is present.
7. A free energy diagram is shown below of a reaction that occurs in most cells (it's part of glycolysis). The reactant is a molecule called phosphoenolpyruvate (PEP). In this reaction, a bond is broken resulting in two products, pyruvate and an inorganic phosphate (Pi).
From the list below, select all the TRUE statements regarding this recation. You may select more than one answer.
Select one or more:
a. The reaction is spontaneous.
b. The reaction is exergonic.
c. An enzyme is not needed for this reaction to occur in a cell.
d. If an enzyme was present that could catalyze this reaction, the enzyme would have the effect of lowering the free energy of BOTH the reactant and the products.
Explanation / Answer
1) Eukaryotic, membrane, higher
2) Answer D) Actively exports proteins. ER folds the protein molecules in sacs (Cisternae) and transport them to Golgi apparatus.
3) Correct answer is D) Contains circular DNA. All other options belong to Eukaryotic nucleus
4) the correct answer is option D). Enzyme function is dependent on the 3D structure or conformation of the enzyme. Thus, "Conformation of the enzyme is essential to it's function because there is a highly specific interaction between the enzyme and substrate in the active site."
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