Glucoamylases are amylases that hydrolyze both α-1,4- and α-1,6-glycosidic bonds. These enzymes (glucoamylases) degrade starch into D-glucose.
- Glucoamylases are amylase enzymes involved in the hydrolysis of starch to its subunits (i.e., glucose monomers).
- Glucoamylases are considered exo-acting enzymes involved in the release of glucose units from the nonreducing ends of the starch polymer chains.
- Glucoamylase enzymes are only present in bacteria, archaea, and fungi.
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Answer:B). Cell membranes are composed of a lipid bilayer.
Explanation: A membrane is a lipid bilayer that surrounds the cell. Lipids have two parts: the fatty acid chain (the tail) and the phosphate group (the head).
The phosphate head groups are polar, face outward and interact with the outside environment of the cell. The fatty acid chain is hydrophobic and nonpolar, face each other in the bilayer thus forming a hydrophobic fluid interior.
The hydrophobic nature of the bilayer interior makes the membrane to permit only nonpolar and hydrophobic molecules to pass through the cell membrane. This is the reason the membrane allows only molecules that dissolve in the lipid bilayer to pass through to enter or leave the cell.