BIO108 LAB UMKC EXAM QUESTIONS AND ANSWERS
100% CORRECT
What does it mean that science is based on empirical knowledge? - ANSWER It means
that it's based on observations.
Name two other characteristics of science. - ANSWER Based on empirical knowledge,
rationality, repeatability, testability, commitment to experimentation, looking for
generalization.
If your hypothesis were that SO2 negatively affects plant growth, what's the dependent
variable? - ANSWER The length/growth of the plant.
What was the independent variable in the Monarch butterfly experiment? - ANSWER The
butterflies (both infected & uninfected)
What was the control in the Monarch butterfly experiment? - ANSWER The group of
uninfected butterflies.
What is a dependent variable? - ANSWER What you are measuring; it is dependent on
other variables
What is an independent variable? - ANSWER The variable that you are manipulating and
controlling in the experiment.
What does it mean that "science depends on interactions within the scientific
community"? - ANSWER You ask the scientific community about your ideas and you
study experiments done in the past in order to help you, and therefore help science.
If a hypothesis is false, then what is the prediction? - ANSWER If the hypothesis is false,
then the prediction is true or false.
In microscopy, what is depth of field? - ANSWER The thickness of the specimen that may
be seen in focus at one time (the vertical range of focus)
What's the relationship between magnification and depth of field? - ANSWER The higher
the magnification, the smaller the depth of field.
What's the relationship between wavelength of light and optical resolution of a
microscope? - ANSWER The shorter the wavelength, the higher the resolution.
How does adding oil between the specimen and objective lens increase resolution?
What do you change in the equation? - ANSWER The oil disperses the light more, what is
changed is the refractive index.
Why is a microscope called a "compound microscope"? - ANSWER Because it has two
, or more lenses.
Which wavelength of light gives higher resolution in your microscope using the same
objective lens and n value?
700 nm or 300 nm - ANSWER 300 nm, the shorter the wavelength, the higher the
resolution/
Your microscope's total magnification is 400x. The ocular is 10x. What is the
magnification of the objective lens? - ANSWER x=40x
ocular times objective= total magnification
What does the term "binocular" mean when it is used for a light microscope? - ANSWER
Two ocular lenses
What is the main reason why electron microscopes have much higher resolutions than
light microscopes? - ANSWER The shorter the wavelength, the higher the resolution
When you want to spot an objected/structure under the light microscope, what
magnification would you first use, & why? - ANSWER The lowest magnification because
if has the highest field of view
What is diffusion? - ANSWER Movement of material from areas of high concentration to
areas of low concentration.
What is osmosis? - ANSWER The diffusion of water through a semipermeable membrane
from an area of higher concentration to an area of low concentration.
How do you know that starch did not diffuse in the bag? - ANSWER There's no iodine
outside the bag, you know this because the color didnt change
Benedict's solution turns yellow in the presence of glucose. This is because glucose is a
_______ sugar. - ANSWER reducing
When plant cells are placed in a hypertonic solution, their weight will ______. - ANSWER
decrease
To tell the osmolarity of potato cells, you chose one sucrose solution out of 6. How did
you know which one to pick? - ANSWER You pick the isotonic solution (the one that had
the least amount of weight change)
Plasmolysis occurs when plant cells are placed in a _________. - ANSWER hypertonic
100% CORRECT
What does it mean that science is based on empirical knowledge? - ANSWER It means
that it's based on observations.
Name two other characteristics of science. - ANSWER Based on empirical knowledge,
rationality, repeatability, testability, commitment to experimentation, looking for
generalization.
If your hypothesis were that SO2 negatively affects plant growth, what's the dependent
variable? - ANSWER The length/growth of the plant.
What was the independent variable in the Monarch butterfly experiment? - ANSWER The
butterflies (both infected & uninfected)
What was the control in the Monarch butterfly experiment? - ANSWER The group of
uninfected butterflies.
What is a dependent variable? - ANSWER What you are measuring; it is dependent on
other variables
What is an independent variable? - ANSWER The variable that you are manipulating and
controlling in the experiment.
What does it mean that "science depends on interactions within the scientific
community"? - ANSWER You ask the scientific community about your ideas and you
study experiments done in the past in order to help you, and therefore help science.
If a hypothesis is false, then what is the prediction? - ANSWER If the hypothesis is false,
then the prediction is true or false.
In microscopy, what is depth of field? - ANSWER The thickness of the specimen that may
be seen in focus at one time (the vertical range of focus)
What's the relationship between magnification and depth of field? - ANSWER The higher
the magnification, the smaller the depth of field.
What's the relationship between wavelength of light and optical resolution of a
microscope? - ANSWER The shorter the wavelength, the higher the resolution.
How does adding oil between the specimen and objective lens increase resolution?
What do you change in the equation? - ANSWER The oil disperses the light more, what is
changed is the refractive index.
Why is a microscope called a "compound microscope"? - ANSWER Because it has two
, or more lenses.
Which wavelength of light gives higher resolution in your microscope using the same
objective lens and n value?
700 nm or 300 nm - ANSWER 300 nm, the shorter the wavelength, the higher the
resolution/
Your microscope's total magnification is 400x. The ocular is 10x. What is the
magnification of the objective lens? - ANSWER x=40x
ocular times objective= total magnification
What does the term "binocular" mean when it is used for a light microscope? - ANSWER
Two ocular lenses
What is the main reason why electron microscopes have much higher resolutions than
light microscopes? - ANSWER The shorter the wavelength, the higher the resolution
When you want to spot an objected/structure under the light microscope, what
magnification would you first use, & why? - ANSWER The lowest magnification because
if has the highest field of view
What is diffusion? - ANSWER Movement of material from areas of high concentration to
areas of low concentration.
What is osmosis? - ANSWER The diffusion of water through a semipermeable membrane
from an area of higher concentration to an area of low concentration.
How do you know that starch did not diffuse in the bag? - ANSWER There's no iodine
outside the bag, you know this because the color didnt change
Benedict's solution turns yellow in the presence of glucose. This is because glucose is a
_______ sugar. - ANSWER reducing
When plant cells are placed in a hypertonic solution, their weight will ______. - ANSWER
decrease
To tell the osmolarity of potato cells, you chose one sucrose solution out of 6. How did
you know which one to pick? - ANSWER You pick the isotonic solution (the one that had
the least amount of weight change)
Plasmolysis occurs when plant cells are placed in a _________. - ANSWER hypertonic
