Bacterial Transformation and Gel Electrophoresis

Mr. Anderson guides students through AP Biology Lab 6, focusing on molecular biology. The lab is divided into two parts: bacterial transformation and gel electrophoresis. In bacterial transformation, students learn how to use plasmids to alter bacteria, specifically using the P glow plasmid to make E. coli glow. Gel electrophoresis is used to separate DNA fragments by size, employing restriction enzymes to cut DNA at specific sites. The video covers practical steps, analysis, and expected outcomes of the experiments.

What are the two main parts of the molecular biology lab discussed in the video?

• DNA replication and protein synthesis

• Photosynthesis and cellular respiration

• Cell division and genetic mutation

• Bacterial transformation and gel electrophoresis

What is the purpose of using the P glow plasmid in bacterial transformation?

• To change the shape of bacterial cells

• To increase the growth rate of bacteria

• To enable bacteria to glow under UV light

• To make bacteria resistant to antibiotics

Which sugar is used as a trigger to activate the glowing protein in transformed bacteria?

• Fructose

• Arabinose

• Sucrose

• Glucose

What is the role of ampicillin in the bacterial transformation experiment?

• To enhance the fluorescence of bacteria

• To increase the temperature of the culture

• To act as a selective agent for transformed bacteria

• To provide nutrients for bacterial growth

In gel electrophoresis, DNA fragments are separated based on what characteristic?

• Size

• Shape

• Color

• Charge

What is the function of restriction enzymes in DNA analysis?

• To replicate DNA

• To cut DNA at specific sequences

• To bind DNA fragments together

• To color DNA for visualization

How does a DNA ladder assist in gel electrophoresis analysis?

• It changes the color of DNA bands

• It speeds up the migration of DNA

• It increases the resolution of the gel

• It provides a reference for fragment size

What happens to smaller DNA fragments during gel electrophoresis?

• They remain stationary

• They move faster than larger fragments

• They change color

• They move slower than larger fragments

Why might different restriction enzymes produce different patterns in gel electrophoresis?

• They change the charge of DNA fragments

• They bind to DNA with different strengths

• They cut DNA at different specific sequences

• They cut DNA at different temperatures

What is the significance of using a micro pipette in gel electrophoresis?

• To change the color of DNA bands

• To accurately load small amounts of DNA

• To increase the speed of DNA migration

• To measure the pH of the gel