BIO 111 TAMU lab Exam 1 UPDATED
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Accuracy - CORRECT ANSWER✅✅a measure of how close a result matches a correct or
standard value. For example, how close a dart is to the bullseye in a dartboard is an indicator
of accuracy.
Precision - CORRECT ANSWER✅✅a measure of variability. For example, three darts
placed close together on a dartboard indicate high precision, but if this cluster of darts is far
from the bullseye it would also indicate low accuracy.
an ideal experiment - CORRECT ANSWER✅✅yields results with both high accuracy and
high precision. Although biological and/or environmental conditions may limit one or both of
these features, poor technique is an unacceptable source of errors.
Aliquot - CORRECT ANSWER✅✅a portion of something (noun); or to divide or transfer
a portion of something (verb). For this lab, aliquot refers to an amount of liquid.
Micropipette - CORRECT ANSWER✅✅an instrument used to measure/deliver amounts
of liquid with high accuracy and precision. Micropipettes are expensive so treat these with
respect.
Spectrophotometer: - CORRECT ANSWER✅✅an instrument for measuring the intensity
of light that is transmitted through a sample (transmittance) or absorbed by a sample
(absorbance). In this lab, you will measure light absorbance at a defined wavelength. The use
of a spectrophotometer is called spectrophotometry.
Molar weight - CORRECT ANSWER✅✅a measure of mass. By definition, a mole is
6x1023 objects (atoms, molecules, Aggies, etc.). The mass of an object is defined by its
composition at the atomic level.
Standard curve - CORRECT ANSWER✅✅a graph in which properties of known samples
are measured and plotted. The direct proportionality of these properties can then be used to
determine the same information from unknown samples. In this lab, a standard curve of
Absorbance versus protein concentration will be used to determine the concentration of
protein in an unknown sample.
Standard Curve Practice Problems - CORRECT
ANSWER✅✅https://mathbench.umd.edu/modules/measurement_beerslaw/page01.htm
Molar Weight Practice Problems - CORRECT
ANSWER✅✅https://mathbench.umd.edu/modules/measurement_molarity/page01.htm
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Accuracy - CORRECT ANSWER✅✅a measure of how close a result matches a correct or
standard value. For example, how close a dart is to the bullseye in a dartboard is an indicator
of accuracy.
Precision - CORRECT ANSWER✅✅a measure of variability. For example, three darts
placed close together on a dartboard indicate high precision, but if this cluster of darts is far
from the bullseye it would also indicate low accuracy.
an ideal experiment - CORRECT ANSWER✅✅yields results with both high accuracy and
high precision. Although biological and/or environmental conditions may limit one or both of
these features, poor technique is an unacceptable source of errors.
Aliquot - CORRECT ANSWER✅✅a portion of something (noun); or to divide or transfer
a portion of something (verb). For this lab, aliquot refers to an amount of liquid.
Micropipette - CORRECT ANSWER✅✅an instrument used to measure/deliver amounts
of liquid with high accuracy and precision. Micropipettes are expensive so treat these with
respect.
Spectrophotometer: - CORRECT ANSWER✅✅an instrument for measuring the intensity
of light that is transmitted through a sample (transmittance) or absorbed by a sample
(absorbance). In this lab, you will measure light absorbance at a defined wavelength. The use
of a spectrophotometer is called spectrophotometry.
Molar weight - CORRECT ANSWER✅✅a measure of mass. By definition, a mole is
6x1023 objects (atoms, molecules, Aggies, etc.). The mass of an object is defined by its
composition at the atomic level.
Standard curve - CORRECT ANSWER✅✅a graph in which properties of known samples
are measured and plotted. The direct proportionality of these properties can then be used to
determine the same information from unknown samples. In this lab, a standard curve of
Absorbance versus protein concentration will be used to determine the concentration of
protein in an unknown sample.
Standard Curve Practice Problems - CORRECT
ANSWER✅✅https://mathbench.umd.edu/modules/measurement_beerslaw/page01.htm
Molar Weight Practice Problems - CORRECT
ANSWER✅✅https://mathbench.umd.edu/modules/measurement_molarity/page01.htm
