How much do you know about glycogen synthesis?

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Which of the following is true about glycogenin?

It needs another enzyme to form a new glycogen branch

It produces α-1,6 branches

It can only add one glucose molecule at a time

It has a tyrosine with a hydroxyl group (correct)

Which enzyme transfers a terminal fragment of 6-7 glucose residues to an internal glucose residue at the C-6 hydroxyl position?

Glycogen synthase

Glycogenin

Amylo-(1,4-1,6)-transglycosylase (correct)

Branching enzyme

What is the site of the 1st glucose to attach to glycogenin?

A histidine with a hydroxyl group

A threonine with a hydroxyl group

A serine with a hydroxyl group

A tyrosine with a hydroxyl group (correct)

How many glucose molecules are added to glycogenin before the new glycogen chain is ready to be acted upon by glycogen synthase?

Around 7 Signup and view all the answers

What is the function of glycogen synthase?

To synthesize glycogen from glucose Signup and view all the answers

What is the term used to describe amylo-(1,4-1,6)-transglycosylase?

Branching enzyme Signup and view all the answers

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 Signup and view all the answers

What is the name of the enzyme that adds glucose molecules to glycogenin to form a new glycogen branch?

Glycogenin Signup and view all the answers

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 Signup and view all the answers

What is the function of the α-1,6 branches in glycogen?

To increase solubility and accessibility of stored glucose Signup and view all the answers

What is the name of the enzyme that breaks down glycogen into glucose?

Glycogen phosphorylase Signup and view all the answers

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 Signup and view all the answers

Which of the following is true about glycogenin?

It has a tyrosine with a hydroxyl group Signup and view all the answers

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 Signup and view all the answers

What is the site of the 1st glucose to attach to glycogenin?

A tyrosine with a hydroxyl group Signup and view all the answers

How many glucose molecules are added to glycogenin before the new glycogen chain is ready to be acted upon by glycogen synthase?

Around 7 Signup and view all the answers

What is the function of glycogen synthase?

To break down glycogen into glucose Signup and view all the answers

What is the term used to describe amylo-(1,4-1,6)-transglycosylase?

Branching enzyme Signup and view all the answers

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 Signup and view all the answers

What is the name of the enzyme that adds glucose molecules to glycogenin to form a new glycogen branch?

Glycogenin Signup and view all the answers

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 Signup and view all the answers

What is the function of the α-1,6 branches in glycogen?

To increase solubility and accessibility of stored glucose Signup and view all the answers

What is the name of the enzyme that breaks down glycogen into glucose?

Glycogen phosphorylase Signup and view all the answers

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 Signup and view all the answers

Which enzyme is responsible for forming a new glycogen branch by adding glucose molecules without the need of another enzyme?

Glycogenin Signup and view all the answers

What is the site of the first glucose to attach to glycogenin?

A tyrosine with a hydroxyl group Signup and view all the answers

How many glucose molecules are added to glycogenin before the new glycogen chain is ready to be acted upon by glycogen synthase?

Around 7 Signup and view all the answers

What is the name of the enzyme responsible for producing α-1,6 branches in glycogen?

Amylo- (1 , 4 - 1 , 6)- transglycosylase Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

How much do you know about glycogen synthesis?

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Questions and Answers

Which of the following is true about glycogenin?

Which enzyme transfers a terminal fragment of 6-7 glucose residues to an internal glucose residue at the C-6 hydroxyl position?

What is the site of the 1st glucose to attach to glycogenin?

How many glucose molecules are added to glycogenin before the new glycogen chain is ready to be acted upon by glycogen synthase?

What is the function of glycogen synthase?

What is the term used to describe amylo-(1,4-1,6)-transglycosylase?

What is the position of the internal glucose residue that receives the terminal fragment of 6-7 glucose residues from the branching enzyme?

What is the name of the enzyme that adds glucose molecules to glycogenin to form a new glycogen branch?

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?

What is the function of the α-1,6 branches in glycogen?

What is the name of the enzyme that breaks down glycogen into glucose?

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?

Which of the following is true about glycogenin?

Which enzyme transfers a terminal fragment of 6-7 glucose residues to an internal glucose residue at the C-6 hydroxyl position?

What is the site of the 1st glucose to attach to glycogenin?

How many glucose molecules are added to glycogenin before the new glycogen chain is ready to be acted upon by glycogen synthase?

What is the function of glycogen synthase?

What is the term used to describe amylo-(1,4-1,6)-transglycosylase?

What is the position of the internal glucose residue that receives the terminal fragment of 6-7 glucose residues from the branching enzyme?

What is the name of the enzyme that adds glucose molecules to glycogenin to form a new glycogen branch?

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?

What is the function of the α-1,6 branches in glycogen?

What is the name of the enzyme that breaks down glycogen into glucose?

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?

Which enzyme is responsible for forming a new glycogen branch by adding glucose molecules without the need of another enzyme?

What is the site of the first glucose to attach to glycogenin?

How many glucose molecules are added to glycogenin before the new glycogen chain is ready to be acted upon by glycogen synthase?

What is the name of the enzyme responsible for producing α-1,6 branches in glycogen?

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?

What is the position of the internal glucose residue that the branching enzyme transfers the terminal fragment of glucose residues to?

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?

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?

What is the name of the enzyme that acts upon the new glycogen chain after the addition of around seven glucose molecules by glycogenin?

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?

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?

What is the position of the hydroxyl group on the tyrosine that serves as the site of the first glucose to attach to glycogenin?

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