Biology Unit 3: How do Cells Maintain Life?

Prerequisites

Students are advised to complete Biology Units 1 and 2 before undertaking Biology Unit 3.

Course Description

In this unit students investigate the workings of the cell from several perspectives. They explore the relationship between nucleic acids and proteins as key molecules in cellular processes. Students analyse the structure and function of nucleic acids as information molecules, gene structure and expression in prokaryotic and eukaryotic cells and proteins as a diverse group of functional molecules. They examine the biological consequences of manipulating the DNA molecule and applying biotechnologies.

Students explore the structure, regulation and rate of biochemical pathways, with reference to photosynthesis and cellular respiration. They explore how the application of biotechnologies to biochemical pathways could lead to improvements in agricultural practices.

Students apply their knowledge of cellular processes through investigation of a selected case study, data analysis and/or a bioethical issue. Examples of investigation topics include, but are not limited to: discovery and development of the model of the structure of DNA; proteomic research applications; transgenic organism use in agriculture; use, research and regulation of gene technologies, including CRISPR-Cas9; outcomes and unexpected consequences of the use of enzyme inhibitors such as pesticides and drugs; research into increasing efficiency of photosynthesis or cellular respiration or impact of poisons on the cellular respiration pathway.

Areas of Study

What is the role of nucleic acids and proteins in maintaining life?

In this area of study students explore the expression of the information encoded in a sequence of DNA to form a protein and outline the nature of the genetic code and the proteome. They apply their knowledge to the structure and function of the DNA molecule to examine how molecular tools and techniques can be used to manipulate the molecule for a particular purpose. Students compare gene technologies used to address human and agricultural issues and consider the ethical implications of their use.

How are biochemical pathwayds regulated?

In this area of study students focus on the structure and regulation of biochemical pathways. They examine how biochemical pathways, specifically photosynthesis and cellular respiration, involve many steps that are controlled by enzymes and assisted by coenzymes. Students investigate factors that affect the rate of cellular reactions and explore applications of biotechnology that focus on the regulation of biochemical pathways.

Assessment

Outcomes	Assessment Tasks	Marks Allocated
Outcomes	(school-assessed coursework)	Marks Allocated
Analyse the relationship between nucleic acids and proteins and evaluate how tools and techniques can be used and applied in the manipulation of DNA.	One task selected from: analysis and evaluation of a selected biological case study analysis and evaluation of generated primary and/or collated secondary data comparison and evaluation of biological concepts, methodologies and methods, and findings from three student practical activities analysis and evaluation of a contemporary bioethical issue.	40
Analyse the structure and regulation of biochemical pathways in photosynthesis and cellular respiration and evaluate how biotechnology can be used to solve problems related to the regulation of biochemical pathways.	One task selected from: analysis and evaluation of a selected biological case study analysis and evaluation of generated primary and/or collated secondary data comparison and evaluation of biological concepts, methodologies and methods, and findings from three student practical activities analysis and evaluation of a contemporary bioethical issue.	40
Total Marks		80

Overall Final Assessment

Graded Assessment	Title	Assessment	Exam Duration	Contribution to Study Score (%)
1	Unit 3 Coursework	School-assessed		20
2	Unit 4 Coursework	School-assessed		30
3	Written Examination	November	2.5 hours	50