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Biology
A Level

Describe the Cardiac Cycle

The Cardiac Cycle can be split into three stages: Diastole, Atrial Systole, and Ventricular Systole. (Left side of heart used for example purposes). Atrial Systole: Blood enters the atrium via the pulmona...

AM
Answered by Angus M. Biology tutor
3262 Views

Describe the mechanism of the polymerase chain reaction.

The polymerase chain reaction (PCR) is basically a series of three-stage cycles, each stage occurring at a different temperature. The three stages are denaturation, annealing and extension.Denaturation ta...

RK
Answered by Reka K. Biology tutor
2912 Views

Describe the structures of proteins.

Proteins are made up of the primary structure, secondary structure and tertiary structure. Some proteins may also have a quaternary structure. The primary structure is the specific sequence of amino acids...

LO
Answered by Lucy O. Biology tutor
2253 Views

Describe two differences between mitochondria and prokaryotic cells such as bacteria?

Mitochondria: (statements should be comparative)Has a double membrane;No cell wall;No capsule;No flagellum/ pili;No mesosome;No plasmids

AG
Answered by Abigail G. Biology tutor
7660 Views

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

Facilitated diffusion involves the use of channel and carrier proteins to assist the diffusion of molecules or ions down a concentration gradient, as this is a passive process it does not require ATP (the...

HT
Answered by Holly T. Biology tutor
2283 Views

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