Biochemistry : Identifying Specific Protein Functions
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Example Question #12 : Identification By Function
Kinase reactions involve enzymes that __________.
use 
reduce aldehydes to alcohols
transfer groups from one part of a molecule to another part
add phosphate groups to another molecule
add phosphate groups to another molecule
Kinases are enzymes that add phosphate groups to molecules. Phosphatases remove phosphate groups from molecules. Common reducing agents in biological systems are 
Example Question #11 : Identifying Specific Protein Functions
What is the action of a phosphatase?
Rearranges bonds in a molecule
Forms a chemical bond
Breaks a chemical bond
Removes of a phosphate group
Adds of a phosphate group
Removes of a phosphate group
The action of a phosphatase is to remove a phosphate group from a molecule. A kinase adds phosphate groups, an isomerase rearranges bonds, a ligase forms a chemical bond, and a lyase breaks a chemical bond.
Example Question #13 : Identifying Specific Protein Functions
What is one of the ways by which a potassium channel maintains great specificity for 
The channel is always closed and only open when a 
The channel constricts down to 
The channel uses internal enzyme activity to degrade all other molecules
The channel allows other molecules through, but then immediately sends them backwards through the channel
Charges within the channel repel all other molecules
The channel constricts down to
The potassium channel is initially 
Example Question #12 : Identifying Specific Protein Functions
A deficiency in which fat soluble vitamin results in impaired night time vision?
Vitamin B12
Vitamin A
Vitamin D
Vitamin K
Vitamin E
Vitamin A
Vitamins D, E, A, and K are all fat soluble vitamins. Vitamin A (retinol) plays an important role in the visual pigments within the rods and cones of the retina. Deficiency of this vitamin produces night blindness, as these important retinal cells are unable to function properly.
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