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Contrast the processes of facilitated diffusion and active transport. (3 marks)

Key Points: 1) Active transport requires energy in the form of ATP whereas facilitated diffusion does not require energy; it is a passive process 2) Active transport can move molecules against their concentr...
GP
Answered by Grace P. • Biology tutor
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What happens in the cardiac cycle?

The cardiac cycle is driven by the myocytes in the heart, which are a special type of muscle tissue which are able to contract without input from the nervous system. This starts with a tissue called the Sino...
EJ
Answered by Eleanor J. • Biology tutor
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Describe the light-dependent reactions of photosynthesis.

The light-dependent reactions of photosynthesis occur in the thylakoid membrane of the chloroplast in a plant cell. Embedded in this membrane are two chlorophyll-protein complexes called photosystem 1 and ph...
EH
Answered by Emily H. • Biology tutor
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Describe the difference in molecular structure between and unsaturated fatty acid and saturated fatty acid

Unsaturated fatty acids have double bonds between carbons which means they can accept hydrogen when this bond is broken. Saturated fatty acids lack these double bonds and so the fatty acid molecule is satura...
EF
Answered by Ella F. • Biology tutor
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How does blood flow through the heart?

The heart is the muscle responsible for pumping blood around the body. It has four chambers: an atrium and ventricle on the left, and an atrium and ventricle on the right. Atrioventricular and semilunar valv...
MB
Answered by Moriom B. • Biology tutor
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