Lab Midterm Flashcards
How do you properly label a test tube?
Name, Class, Project, Constituent, Date
1 ul equals _______mL
1 x 10^-3
1000 ul equals _______ mL
1 mL
What can affect the precision of a scale?
Vibrations, magnetic field, humidity, and barometric pressure
Describe a load cell.
A circuit with a lever that produces an electric current directly proportional to the depression of the lever
What is precision?
The extent to which a given set of measurements of the same sample agree with their mean
What is accuracy?
The extent to which a given measurement agrees with the standard value for that measurement
What is standard deviation?
A measure of how spread out numbers are
What is used to compare two groups of data?
Student’s T-Test
_______ are the most basic unit of the human body.
Cells
What were collected from scrapping our cheeks and what are they?
Keratinocytes
What was the purpose of collecting cells from our cheeks?
We were trying to quantitate cell number and viability
What dye was used in the cheek cell lab to indicate whether a cell was alive or dead?
Trypan Blue
What is a hemocytometer?
A piece of equipment that was initially used to count blood cells
What are hemocytometers used for today?
To count abnormal patient blood cells, sperm counts for fertility clinics, to record cell growth over time, and yeast cells for fermentation
Who developed the hemocytometer?
Louis- Charles Malassez
What percentage of practitioners still utilize the hemocytometer for cell counting?
70%
What are symptoms of Alkaptonuria?
Darkened urine, pigmentation of connective tissue, joint and spine arthritis, and destruction of the cardiac valves
What is the gene that is responsible for Alkaprtonuria?
Homogentisate 1, 2- dioxygenase
What protein- digesting enzyme do pineapples contain?
Bromelain
What does bromelain?
It is a protease, it chops up other proteins
What is gelatin made out of?
Collagen
What happens when you add water to gelatin?
Long chains of protein from. Water gets trapped in these long chains, turning the liquid into a solid
What does the pineapple do to the gelatin?
The pineapple digests proteins and eats away the gelatin
