# EnzymeQA

> EnzymeQA (iPhone/iPad app by JPG Malthouse.)

- Source: https://appshunter.io/ios/app/enzymeqa/id412649030 (this page in markdown: same URL + `.md`)
- Developer: [JPG Malthouse](https://appshunter.io/developer/406042694)
- Category: Education, Reference
- Price: Free (on sale, was $0.99)
- Age rating: 4+
- Requires: iOS 12.0 · 0 MB
- Languages: American English
- Released: 2011-01-05
- Data updated: 2026-05-17
- User reviews in markdown: https://appshunter.io/ios/app/enzymeqa/id412649030/reviews.md

## What is EnzymeQA?

EnzymeQA is an App containing about 160 revision questions and answers on enzymology. It is restricted to considering single substrate catalysis. It is hoped that it will help University undergraduate and postgraduate students revise enzymology at home or on the go. It is not an exhaustive treatment of enzymology. However, it is hoped that it will enable you to test your knowledge of key facts in enzymology.

For those of you planning to determine kcat, kcat/Km and Km, EnzymeQA should  help you check that you have the appropriate experimental conditions for determining catalytic constants. Likewise it should help  planning to determine Ki values for competitive inhibition.

If you have Michaelis-Menten data to analyze you might be interested in the Mac program MMfit which is in the Mac App store. If you have IC50 data to analyse you may also be interested in the program IC50fit in the Mac App store.

Topics in EnzymeQA include:

Window 1
Michaelis Menten equation.
Initial rate measurements.
Setting the appropriate concentrations of enzyme and substrate for determining catalytic parameters.
Defining Vm, kcat, Km, kcat/Km, Ki and IC50 values.
Units of catalytic constants.
Order in enzyme and substrate at various substrate concentrations.
Methods for determining catalytic constants.
Experimental conditions for measuring catalytic constants.
Activities and Specific Activities.
Determining kcat/Km by complete turnover of substrates.

Window 2
Competitive inhibition.
Determining Ki values for competitive inhibition.
Relationship between Ki and IC50 values.
Brief mention of noncompetitive, mixed and uncompetitive inhibition.

Window 3
pH and pH values
Analysis of pH data
log plots
pH dependence of catalytic constants.

Window 4
Elisa
Enzyme cycling
Spectrophotometric versus fluorescence assays
FRET assays
Plate reader enzyme assays
Stopped flow


Window 5
Transition state analogues
Catalytic antibodies
Ribozymes


## Version history (last 5 releases)

### 2.4 — 2023-04-05

This is a minor update with some new screenshots. Some Kinetics questions and answers have been modified.

### 2.3 — 2019-11-23

Some new pH questions have been added and some answers have been extended. The screenshots and App have been updated.

### 2.2 — 2016-10-12

Minor bug fixes ensuring compatibility with multiple devices.

### 2.1 — 2016-10-01

In this version the app has been updated and 26 new questions and answers have been added. There are new questions on; spectrophotometric and fluorescence assays, FRET assays, the advantages and disadvantages of plate reader assays, stopped flow and pH.

### 2.0 — 2013-03-12

In this version the program is converted from a 1 page App to a 5 page App. Additional questions have been added on topics such as pH, Elisa, enzyme cycling, transition state analogues and catalytic antibodies.

## Apps similar to EnzymeQA

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [PennDOT PA CDL Permit Test](https://appshunter.io/ios/app/penndot-pa-cdl-permit-test/id1605980920) | 4.7 (164) | Free | Education |
| [Ohio CDL Permit Test](https://appshunter.io/ios/app/ohio-cdl-permit-test/id1605980440) | 4.9 (40) | Free | Education |
| [Smart Vietnamese Dictionary](https://appshunter.io/ios/app/smart-vietnamese-dictionary/id1606886580) | — | Free | Education |
| [Malpi Int'l School](https://appshunter.io/ios/app/malpi-intl-school/id1611707020) | — | Free | Education |
| [Airbus A320 Systems Trainer](https://appshunter.io/ios/app/airbus-a320-systems-trainer/id1617112160) | — | $39.99 | Education |
| [Canada Citizenship Test 2026](https://appshunter.io/ios/app/canada-citizenship-test-2026/id1611949900) | 4.3 (29) | Free | Education |

## More apps by JPG Malthouse

- [AminoAcidQA](https://appshunter.io/ios/app/aminoacidqa/id406042691)
- [NMRQA](https://appshunter.io/ios/app/nmrqa/id414947784)
- [WEIGHTS](https://appshunter.io/ios/app/weights/id577974449)

All apps by JPG Malthouse: https://appshunter.io/developer/406042694

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-17.*