Biochemistry
Showing posts with label Biochemistry. Show all posts
Showing posts with label Biochemistry. Show all posts

Certain enzymes, like those in the Glycogen Breakdown Cascade, are active only when phosphorylated. Suppose you wanted to produce a version of the enzyme that is constitutively active, i.e. active all the time? You can alter the gene and replace a certain:

Certain enzymes, like those in the Glycogen Breakdown Cascade, are active only when phosphorylated. Suppose you wanted to produce a version of the enzyme that is constitutively active, i.e. active all the time? You can alter the gene and replace a certain:




A. S with K
B. S with T
C. S with E
D. T with R
E. A with B
F. S with A


Answer: C

Protein Kinase A binds to the sequences RRGSE in substrate proteins, and transfers a phosphate from ATP to the Serine (S) in that sequence. A protein with the sequence RRGAE would be called what?

Protein Kinase A binds to the sequences RRGSE in substrate proteins, and transfers a phosphate from ATP to the Serine (S) in that sequence. A protein with the sequence RRGAE would be called what?




A. a substrate
B. a glycoprotein
C. a pseudosubstrate
D. an activator
E. an allosteric modulator


Answer: C

What is mysterious about the K+ channel that requires an explanation?

What is mysterious about the K+ channel that requires an explanation?




A. It is both ligand gated and voltage gated
B. It works against a potassium gradient
C. It excludes sodium, which is a smaller ion
D. Sugar is unable to pass through the channel


Answer: C

When insulin signals ingestion of food, GLUT-4 receptors are:

When insulin signals ingestion of food, GLUT-4 receptors are:



A. rapidly synthesized
B. rapidly destroyed
C. put into inactive mode
D. translocated to outer membranes
E. blocked by binding insulin


Answer: D

The Acetylcholine Receptor is:

The Acetylcholine Receptor is:




A. a voltage gated Na+ channel
B. a ligand gated Na+ channel
C. an enzyme that hydrolyzes Acetylcholine
D. a K+ channel with inactivation
E. none of the above


Answer: B

Cholesterol is found in membranes of which?

Cholesterol is found in membranes of which?



A. Bacteria only
B. Archaea only
C. Eukaryotes only
D. Archaea and Eukaryotes
E. Archaea and Bacteria


Answer: C

The Acetylcholine receptor is

The Acetylcholine receptor is




A. an enzyme that breaks down ACh
B. a voltage gated ion channel
C. a ligand gated ion channel
D. found in the ER


Answer: C

When it is active, Protein Kinase C is:

When it is active, Protein Kinase C is:




A. phosphorylated
B. membrane associated
C. globular and free floating
D. dephosphorylated
E. missing a regulatory subunit


Answer: B
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