Carbs 2 Flashcards Preview

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Flashcards in Carbs 2 Deck (20):
1

In Glycogen synthesis, what enzyme extends the chain?

Glycogen Synthase

2

In Glycogen synthesis what enzyme breaks bonds & makes branch points ?

Glycogen-Branching Enzyme

3

In Glycogen degradation what enzyme removes the Glucose monomers from the non-reducing ends ?

Glycogen Phosphorylase

4

In Glycogen degradation what enzyme breaks the alpha 1-6 bond and adds it to the non-reducing end ?

De-branching enzyme

5

In Glycogen degradation what enzyme breaks off a free glucose ?

Glucosidase

6

How are carbohydrates broken down in the mouth ?

Amylase hydrolyses carbohydrate

7

In what part of the body is there no carbohydrate digestion ?

The stomach

8

Whats happens to carbohydrate in the Duodenum ?

Amylase works the same as it does in the mouth

9

What happens to the digestion of carbohydrates in the jejunum ?

Final digestion occurs

10

What is the name of the enzyme that hydrolyses & works in the Jejunum to break alpha 1-6 bonds

Isomaltase

11

What enzyme in the Jejunum removes Glucose from non-reducing ends

Glucoamylase

12

Name 2 other enzymes that work in the Jejunum to digest carbohydrates

Sucrase & lactase

13

Explain the process of absorption of Glucose through the epithelial lining of the intestine

1: Glucose & 2Na ions enter epithelial cell from intestine
2: 2K ions enter the cell from the blood stream
3: Glucose & 3 Na ions exit through the cell into the blood stream

14

What helps to maintain a low cellular Na ?

Na pump (allows glucose to be moved continuously through cells)

15

What are two natural sugars that cannot be digested by the gut ?

Cellulose & Hemicellulose

16

What is the name of the catalyst that is found in the skeletal muscle (relating to glucose) ?

Hexokinase

17

What is the name of the catalyst that is found in the liver (relating to glucose) ?

Glucokinase

18

What is the Km & Vmax for Hexokinase & Glucokinase ?

Hxokinase: Km = low Vmax = low
Glucokinase: Km = High Vmax = High

19

What happens to Glycogen stores in the liver if blood glucose falls ?

Glycogen -G-6-P - Glucose-6-phosphotase turns it into Glucose which can enter the blood stream

20

How is Glycogen in the muscle processed ?

Glycogen - G-6-P - GLYCOLYSIS = Lactate+ energy