Biology Laboratory Techniques and Concepts

These flashcards cover key concepts and techniques related to biology laboratory exercises, metric conversions, pH testing, and cellular transport mechanisms.

What do IKI, Benedict's, Sudan IV, and Biuret test for?

IKI tests for starch, Benedict's tests for glucose, Sudan IV tests for lipids, and Biuret tests for proteins.

What does a positive IKI test look like?

A positive IKI test looks black.

How do you convert from a smaller unit to a larger unit in the metric system?

Move the decimal to the left.

What do buffers do in biological systems?

Buffers resist pH changes, maintaining stable pH levels essential for chemical reactions and biological processes.

What is the pH of a neutral solution?

The pH of a neutral solution is 7.

What happens when the density of an object is less than the fluid it is placed in?

If the density is less than the fluid, the object will float.

What does the formula D = m/V represent?

D = m/V represents the formula for calculating density, where D is density, m is mass, and V is volume.

How do materials move in passive transport compared to active transport?

Passive transport does not require ATP, while active transport requires ATP.

What is osmotic pressure?

Osmotic pressure is the pressure required to prevent the inward flow of water across a selectively permeable membrane.

What is a hypertonic solution?

A hypertonic solution has a higher solute concentration than the inside of the cell, causing water to leave the cell.

What does a negative Benedict's test look like?

A negative Benedict's test looks blue.

What are euglenas known for?

Euglenas are known for their ability to photosynthesize as well as move using flagella.

What is the relationship between surface area (SA) and volume (V) as an object increases in size?

As volume increases, the surface area to volume ratio (SA:V) decreases.

What happens to a plant cell placed in a hypertonic solution?

In a hypertonic solution, plant cells lose water, causing plasmolysis.