Practical Study Guide: Solutions, Enzymes, and Lac Operon

Vocabulary-style flashcards covering lab procedures, experimental design, enzyme kinetics (amylases), and the Lac Operon based on the practical study guide.

1st Stop

The first point of resistance on a pipette plunger used to accurately measure and draw up a specific volume of liquid.

2nd Stop

The second point of resistance on a pipette plunger used to fully dispense or blow out the liquid from the tip.

$$C_sV_s = C_dV_d$$

The formula used to calculate missing factors when creating a dilution, where 's' represents the stock solution and 'd' represents the desired dilution.

Scientific method

The systematic process used in experimental design to explore observations and answer questions.

Independent variable

The specific factor in an experiment that is manipulated or changed to observe its effects.

Dependent variable

The factor being measured or observed in an experiment, which changes in response to the independent variable.

Controlled variable

Factors that are kept constant and unchanged throughout an experiment to prevent them from affecting the outcome.

Controlled treatment

A baseline group in an experiment that does not receive the experimental manipulation, used for comparison against the results.

Alpha amylase

One of two enzymes focused on in the lab that cuts specific bonds in polysaccharides and is favored by specific environmental pH or temperature conditions.

Beta amylase

An enzyme that differs from alpha amylase in its cutting style and environmental preferences regarding pH and temperature.

Amylopectin

One of two types of polysaccharide molecules studied in the lab, characterized by its unique branched structure and specific number of reducing ends.

Amylose

A type of polysaccharide molecule focused on in the lab that differs in structure from amylopectin.

Reducing ends

Structural features of sugar molecules like amylose and amylopectin that determine how enzymes interact with them.

Mashing process

The procedure where barley sugars and enzymes are used, leading to the activation of enzymes and the breakdown of long-chain sugar molecules.

Fermentation

A process involving specific reactants that produces alcohol and $CO_2$ as products.

Ratio of $CO_2$ to Alcohol

The specific stoichiometric relationship between the carbon dioxide and alcohol produced during the fermentation reaction.

Spectrophotometry

A method used to measure the intensity of light in a part of the spectrum, used in this lab to analyze samples.

Standard curve

A graph or tool used in spectrophotometry to determine the concentration of an unknown sample by comparing it against known standards.

Lac Operon

A genetic system found in specific bacteria whose structure impacts its function in the presence of food sources like lactose or glucose.

b-galactosidase

An enzyme whose function is central to the Lac Operon's ability to process its food source.

CFU

Colony Forming Units; a calculated value used to estimate the number of viable bacteria in a sample.

ONPG

A compound used in a specific test to interpret the results of Lac Operon function and enzyme activity.