36 Questions
Which of the following is true about glycogenin?
It has a tyrosine with a hydroxyl group
Which enzyme transfers a terminal fragment of 6-7 glucose residues to an internal glucose residue at the C-6 hydroxyl position?
Amylo-(1,4-1,6)-transglycosylase
What is the site of the 1st glucose to attach to glycogenin?
A tyrosine with a hydroxyl group
How many glucose molecules are added to glycogenin before the new glycogen chain is ready to be acted upon by glycogen synthase?
Around 7
What is the function of glycogen synthase?
To synthesize glycogen from glucose
What is the term used to describe amylo-(1,4-1,6)-transglycosylase?
Branching enzyme
What is the position of the internal glucose residue that receives the terminal fragment of 6-7 glucose residues from the branching enzyme?
C-6 hydroxyl position
What is the name of the enzyme that adds glucose molecules to glycogenin to form a new glycogen branch?
Glycogenin
What is the minimum length of the polymer from which the branching enzyme transfers a terminal fragment of 6-7 glucose residues to an internal glucose residue at the C-6 hydroxyl position?
11 glucose residues
What is the function of the α-1,6 branches in glycogen?
To increase solubility and accessibility of stored glucose
What is the name of the enzyme that breaks down glycogen into glucose?
Glycogen phosphorylase
What is the name of the enzyme that transfers a terminal fragment of 3-4 glucose residues from the non-reducing end of a glycogen chain to the C-4 hydroxyl group of an adjacent glucose residue?
Debranching enzyme
Which of the following is true about glycogenin?
It has a tyrosine with a hydroxyl group
Which enzyme transfers a terminal fragment of 6-7 glucose residues to an internal glucose residue at the C-6 hydroxyl position?
Amylo-(1,4-1,6)-transglycosylase
What is the site of the 1st glucose to attach to glycogenin?
A tyrosine with a hydroxyl group
How many glucose molecules are added to glycogenin before the new glycogen chain is ready to be acted upon by glycogen synthase?
Around 7
What is the function of glycogen synthase?
To break down glycogen into glucose
What is the term used to describe amylo-(1,4-1,6)-transglycosylase?
Branching enzyme
What is the position of the internal glucose residue that receives the terminal fragment of 6-7 glucose residues from the branching enzyme?
C-6 hydroxyl position
What is the name of the enzyme that adds glucose molecules to glycogenin to form a new glycogen branch?
Glycogenin
What is the minimum length of the polymer from which the branching enzyme transfers a terminal fragment of 6-7 glucose residues to an internal glucose residue at the C-6 hydroxyl position?
11 glucose residues
What is the function of the α-1,6 branches in glycogen?
To increase solubility and accessibility of stored glucose
What is the name of the enzyme that breaks down glycogen into glucose?
Glycogen phosphorylase
What is the name of the enzyme that transfers a terminal fragment of 3-4 glucose residues from the non-reducing end of a glycogen chain to the C-4 hydroxyl group of an adjacent glucose residue?
Debranching enzyme
Which enzyme is responsible for forming a new glycogen branch by adding glucose molecules without the need of another enzyme?
Glycogenin
What is the site of the first glucose to attach to glycogenin?
A tyrosine with a hydroxyl group
How many glucose molecules are added to glycogenin before the new glycogen chain is ready to be acted upon by glycogen synthase?
Around 7
What is the name of the enzyme responsible for producing α-1,6 branches in glycogen?
Amylo- (1 , 4 - 1 , 6)- transglycosylase
What is the minimum length of a polymer of glucose residues that can be used by the branching enzyme to produce α-1,6 branches in glycogen?
10-11 glucose residues
What is the position of the internal glucose residue that the branching enzyme transfers the terminal fragment of glucose residues to?
C-6 hydroxyl position
What is the name of the amino acid with a hydroxyl group that serves as the site of the first glucose to attach to glycogenin?
Tyrosine
What is the name of the enzyme that can add glucose molecules on top of each other to form a new glycogen branch without the need of another enzyme?
Glycogenin
What is the name of the enzyme that acts upon the new glycogen chain after the addition of around seven glucose molecules by glycogenin?
Glycogen synthase
What is the name of the enzyme that transfers a terminal fragment of glucose residues to an internal glucose residue at the C-6 hydroxyl position to produce α-1,6 branches in glycogen?
Amylo- (1 , 4 - 1 , 6)- transglycosylase
What is the minimum length of a polymer of glucose residues that the branching enzyme can transfer a terminal fragment of glucose residues from to produce α-1,6 branches in glycogen?
10-11 glucose residues
What is the position of the hydroxyl group on the tyrosine that serves as the site of the first glucose to attach to glycogenin?
C-6 hydroxyl position
Test your knowledge on glycogen synthesis with our quiz! Learn about the unique role of the enzyme glycogenin in initiating the formation of glycogen branches. Explore the significance of tyrosine and hydroxyl groups in the process and discover how glycogenin sets the stage for further glycogen synthesis. Challenge yourself with our quiz and master the intricacies of glycogen formation!
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