Pearson Edexcel International A Level · Biology (YBI11)

Biological Molecules: Water, Carbohydrates and Lipids: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Biological Molecules: Water, Carbohydrates and Lipids.

10 questions24 marksFree, no account

Question 1

1 mark

Which monosaccharide is typically used as the immediate source of energy for glycolysis in most cells?

Question 2

1 mark

Which sequence correctly describes the flow of events during the cardiac cycle, starting immediately after the atria have filled with blood?

Question 3

1 mark

In the development of atherosclerosis, which event occurs immediately after the inflammatory response triggers the recruitment of monocytes to the damaged endothelium?

Question 4

1 mark

Which structural characteristic is most prominent in an artery compared to a vein, allowing it to withstand and maintain high blood pressure?

Question 5

1 mark

During the phase of the cardiac cycle immediately following atrial systole, the ventricles begin to contract. Which sequence of events describes the state of the valves and the resulting pressure changes in the ventricles during isovolumetric contraction?

Question 6

2 marks

State how antihypertensive drugs help to reduce the risk of cardiovascular disease (CVD).

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Question 7

3 marks

Explain how antihypertensive drugs help reduce the risk of atherosclerosis.

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Question 8

6 marks

During ventricular systole, the pressure in the left ventricle must rise significantly. Explain how the structure of the aorta, specifically its elastic fibres, allows it to maintain a high blood pressure even when the heart is in diastole.

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Question 9

4 marks

Blood vessels and the heart form a complex system designed to maintain mass transport in large animals, overcoming the limitations of diffusion.

a) Explain how the structure of a capillary is specifically adapted to its function of exchange between the blood and tissues. (2)

b) The pressure of the blood changes as it leaves the heart and travels through the systemic circulation. Explain how the structure of an artery wall allows it to withstand and maintain high blood pressure. (2)

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Question 10

4 marks

A student calculated the cardiac output of a resting athlete. The athlete had a heart rate of \(65\) beats per minute and a stroke volume of \(80\text{ cm}^3\).

(a) Calculate the cardiac output in \(\text{dm}^3\text{ min}^{-1}\).
(b) During intense exercise, the cardiac output increased to \(25.0\text{ dm}^3\text{ min}^{-1}\) and the heart rate rose to \(160\) beats per minute. Calculate the new stroke volume.

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