Lesson 3.6.4.2.1
3.6.4.2.1 Insulin, glucagon and the liver Quiz: AQA Biology, Unit 6
20 questions
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Lesson 3.6.4.2.1, Insulin, glucagon and the liver: 20 multiple choice questions for the AQA Biology (7402), Unit 6: Organisms respond to changes in their internal and external environments, written with Revision Ninja.
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The 20 questions
-
Which cells in the pancreas secrete insulin?
- Acinar cells
- Beta cells
- Delta cells
- Alpha cells
-
Which process converts stored glycogen back into glucose in liver cells?
- Gluconeogenesis
- Glycogenesis
- Lipogenesis
- Glycogenolysis
-
What is the primary effect of insulin on blood glucose concentration?
- Stabilises blood pressure
- Decreases blood glucose
- Increases blood glucose
- Stabilises blood glucose
-
Which liver process is directly activated by glucagon to raise blood glucose?
- Glycolysis
- Glycogenolysis
- Glycogenesis
- Lipogenesis
-
What is the synthesis of glucose from non-carbohydrate sources called?
- Glycogenesis
- Gluconeogenesis
- Glycolysis
- Glycogenolysis
-
How does insulin increase glucose uptake into target cells?
- Osmotic pressure shifts
- Direct lipid diffusion
- Active transport pumps
- Channel protein insertion
-
Where do insulin and glucagon bind on target cells?
- Nuclear receptors
- Mitochondrial matrix
- Cytoplasmic enzymes
- Surface receptors
-
Which liver process is stimulated when blood glucose rises after a carbohydrate-rich meal?
- Gluconeogenesis
- Lipolysis
- Glycogenesis
- Glycogenolysis
-
Which combination of processes occurs in the liver during a prolonged fast?
- Glycogenesis only
- Glycogenesis and glycolysis
- Glycogenolysis and gluconeogenesis
- Lipogenesis only
-
Which process do adrenaline and glucagon both stimulate in liver cells?
- Lipogenesis
- Glycogenesis
- Gluconeogenesis
- Glycogenolysis
-
What is the immediate consequence of beta cell destruction on blood glucose after a meal?
- Drops rapidly
- Reaches zero
- Remains entirely normal
- Stays high longer
-
Which specific cells in the islets of Langerhans secrete the hormone glucagon?
- Beta cells
- Acinar cells
- Alpha cells
- Delta cells
-
Blood glucose is 10.0 mmol per dm3 and falls by 20 per cent after insulin acts. What is the new concentration?
- 8.0 mmol per dm3
- 2.0 mmol per dm3
- 12.0 mmol per dm3
- 7.0 mmol per dm3
-
What is the effect of blocking glucagon receptors during an overnight fast?
- No change occurs
- Blood glucose rises
- Glycogenesis increases
- Blood glucose falls
-
What does the liver do when blood glucose is high?
- Releases glucose
- Synthesises amino acids
- Stores as glycogen
- Excretes glucose
-
Why does insulin bind to cell surface receptors instead of entering cells directly?
- It is too small
- It is polar
- It is a monosaccharide
- It is hydrophobic
-
Put these events in the most likely order after a rise in blood glucose: 1 glucose enters cells, 2 insulin is secreted by beta cells, 3 blood glucose returns to normal, 4 glycogen synthesis increases. Which sequence is correct?
- 2, 4, 1, 3
- 1, 2, 4, 3
- 3, 2, 1, 4
- 2, 1, 4, 3
-
Which measurement shows increased liver glucose output when treated with glucagon?
- Intracellular ATP drop
- Released glucose rise
- Glycogen content rise
- Amino acid uptake
-
Blood glucose is 5.0 mmol per dm3 and a hormone causes liver output to rise so that blood glucose increases by 30 per cent. What is the new value?
- 1.5 mmol per dm3
- 8.0 mmol per dm3
- 6.5 mmol per dm3
- 3.5 mmol per dm3
-
Which mechanism allows insulin and glucagon to have opposite effects on liver cells?
- Direct enzyme inhibition
- Shared cell receptor
- Distinct surface receptors
- Intracellular receptors
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