Biology Extended Essay Exemplar: How do ethanol (1.00 mol dm⁻³) and… | RevisionDojo

Loading document preview...

IB Biology SL Extended Essay Example

How do ethanol (1.00 mol dm⁻³) and potassium iodide (0.10 mol dm⁻³) affect the Michaelis–Menten kinetic parameters (K! and V!"#) of catalase extracted from Bos taurus liver during the breakdown of hydrogen peroxide at concentrations of 0.29, 0.59 and 0.88 mol dm⁻³ ?SL

Official IB Result

IB Grade: A

Criteria A: Focus and Method

4/6

Criteria StrandsPro

A.1Topic communication and explanation

Good

A.2Research question formulation and focus

Good

A.3Methodology appropriateness and completeness

Moderate

Criteria Feedback

The student identifies a clear biological system and a relevant investigation into catalase inhibition and enzyme kinetics.
The student's question is specific, quantitative, and tied to a meaningful biochemical problem.
The student includes a reasonable range of experimental conditions and some justification for their choices.

The investigation would be stronger if the question referred more explicitly to final reaction concentrations rather than stock concentrations.
Some of the methodological justification is asserted rather than convincingly demonstrated.
The design has important limitations for kinetic analysis, especially the small substrate range and unresolved control-volume issues.

Criteria B: Knowledge and Understanding

4/6

Criteria StrandsPro

B.1Application of source material

Moderate

B.2Use of terminology and concepts

Moderate

Criteria Feedback

The student uses a solid range of relevant biochemical terminology accurately, including key kinetic and inhibition terms.
The student connects the source material to catalase, hydrogen peroxide, and enzyme kinetics in a way that gives the investigation real biological context.
The student's discussion shows that they understand the basic conceptual framework behind the experiment.

Some of the evidence the student cites appears only loosely connected to the exact biological claims being made.
A few concepts are applied more confidently than the data can fully support.
The student's source base would be stronger if it relied more consistently on directly relevant and authoritative material.

Criteria C: Critical Thinking

12/12

Criteria StrandsPro

C.1Research analysis

Poor

C.2Discussion and evaluation

Poor

C.3Argument development

Poor

Criteria Feedback

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Criteria D: Presentation

4/4

Criteria StrandsPro

D.1Structure appropriateness

Good

D.2Layout and formatting

Good

Criteria Feedback

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Loading scores...

Official IB Result

IB Grade: A

Criteria A: Focus and Method

4/6

Criteria StrandsPro

A.1Topic communication and explanation

Good

A.2Research question formulation and focus

Good

A.3Methodology appropriateness and completeness

Moderate

Criteria Feedback

The student identifies a clear biological system and a relevant investigation into catalase inhibition and enzyme kinetics.
The student's question is specific, quantitative, and tied to a meaningful biochemical problem.
The student includes a reasonable range of experimental conditions and some justification for their choices.

The investigation would be stronger if the question referred more explicitly to final reaction concentrations rather than stock concentrations.
Some of the methodological justification is asserted rather than convincingly demonstrated.
The design has important limitations for kinetic analysis, especially the small substrate range and unresolved control-volume issues.

Criteria B: Knowledge and Understanding

4/6

Criteria StrandsPro

B.1Application of source material

Moderate

B.2Use of terminology and concepts

Moderate

Criteria Feedback

The student uses a solid range of relevant biochemical terminology accurately, including key kinetic and inhibition terms.
The student connects the source material to catalase, hydrogen peroxide, and enzyme kinetics in a way that gives the investigation real biological context.
The student's discussion shows that they understand the basic conceptual framework behind the experiment.

Some of the evidence the student cites appears only loosely connected to the exact biological claims being made.
A few concepts are applied more confidently than the data can fully support.
The student's source base would be stronger if it relied more consistently on directly relevant and authoritative material.

Criteria C: Critical Thinking

12/12

Criteria StrandsPro

C.1Research analysis

Poor

C.2Discussion and evaluation

Poor

C.3Argument development

Poor

Criteria Feedback

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Criteria D: Presentation

4/4

Criteria StrandsPro

D.1Structure appropriateness

Good

D.2Layout and formatting

Good

Criteria Feedback

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.