UArk POB Lab Midterm {LATEST 2026 -
2027 update} QUESTIONS AND ANSWERS
100% CORRECT
Hydrophilic substances that aren't able to diffuse through the membrane without
expending any energy is called ____ and can make use of ___ proteins among others -
correct answer active transport, carrier
In the lab 4 you use a special balloon that is permeable to water but not sucrose to
make an "artificial cell". The balloon is filled with a solution of 20% sucrose and 80%
water and is immersed in a beaker containing a solution of 40% sucrose and 60%
water. What will occur? - correct answer water will leave the balloon
T/f? Cells do not function as well at high temperatures because the rapid movement of
the molecules of the cell membrane makes the cell leaky. Also, many proteins
denature and lose their function at high temps. Excessive heat can also cause
,denaturation of membrane embedded proteins can cause gaps in the cell membrane
thereby making the cells even more leaky. - correct answer true
Which of the following substances would have the most trouble crossing a biological
membrane by diffusing through the lipid bilayer? - correct answer na+
How many graphs will you make with excel using your data from this lab and that your
instructor provides? - correct answer three
What household substances did you test that had a basic (alkaline) ph? - correct
answer soda, sports drink
High temperatures cause more damage than moderate temperatures, but the
previously frozen beets also indicated high levels of damage. What is the best
,explanation for this? - correct answer freezing causes water to expand. The ice then
pokes out through the cells and ruptures the membranes through mechanical damage
During which lab activities were you required to wear eye protection and gloves? -
correct answer temperature experiment, chemical experiment, ph testing household
substances, ph testing chemicals, washing glassware from chemical experiment
T/f? One option for the second experiment was to see if beets exposed to a mixture of
cleaning products shoed more cell damage than those exposed only to individual
chemicals. - correct answer false
When must eye protection (goggles) be worn? - correct answer when your instructor
tells you to, when dealing with any liquids in lab, and while other people at your lab
table are still using lab chemicals even if you are finished with them
, If you break a slide, then you should _____,. - correct answer notify your lab instructor
On the microscope, what are the three metal pieces (different sizes) that hang down
over the stage called? - correct answer objective lenses
T/f? Current evidence supports the idea that some parts of eukaryotic cells evolved
from formerly free living prokaryotic organisms. - correct answer true
As they are considered to be a biohazard, like most human body products not attached
to or enclosed within the body, the slides with your cheek cells on them should be
disposed of ____. - correct answer in the labeled container on the counter, cover slip
and all
What is elodea? - correct answer a plant that has leaves
2027 update} QUESTIONS AND ANSWERS
100% CORRECT
Hydrophilic substances that aren't able to diffuse through the membrane without
expending any energy is called ____ and can make use of ___ proteins among others -
correct answer active transport, carrier
In the lab 4 you use a special balloon that is permeable to water but not sucrose to
make an "artificial cell". The balloon is filled with a solution of 20% sucrose and 80%
water and is immersed in a beaker containing a solution of 40% sucrose and 60%
water. What will occur? - correct answer water will leave the balloon
T/f? Cells do not function as well at high temperatures because the rapid movement of
the molecules of the cell membrane makes the cell leaky. Also, many proteins
denature and lose their function at high temps. Excessive heat can also cause
,denaturation of membrane embedded proteins can cause gaps in the cell membrane
thereby making the cells even more leaky. - correct answer true
Which of the following substances would have the most trouble crossing a biological
membrane by diffusing through the lipid bilayer? - correct answer na+
How many graphs will you make with excel using your data from this lab and that your
instructor provides? - correct answer three
What household substances did you test that had a basic (alkaline) ph? - correct
answer soda, sports drink
High temperatures cause more damage than moderate temperatures, but the
previously frozen beets also indicated high levels of damage. What is the best
,explanation for this? - correct answer freezing causes water to expand. The ice then
pokes out through the cells and ruptures the membranes through mechanical damage
During which lab activities were you required to wear eye protection and gloves? -
correct answer temperature experiment, chemical experiment, ph testing household
substances, ph testing chemicals, washing glassware from chemical experiment
T/f? One option for the second experiment was to see if beets exposed to a mixture of
cleaning products shoed more cell damage than those exposed only to individual
chemicals. - correct answer false
When must eye protection (goggles) be worn? - correct answer when your instructor
tells you to, when dealing with any liquids in lab, and while other people at your lab
table are still using lab chemicals even if you are finished with them
, If you break a slide, then you should _____,. - correct answer notify your lab instructor
On the microscope, what are the three metal pieces (different sizes) that hang down
over the stage called? - correct answer objective lenses
T/f? Current evidence supports the idea that some parts of eukaryotic cells evolved
from formerly free living prokaryotic organisms. - correct answer true
As they are considered to be a biohazard, like most human body products not attached
to or enclosed within the body, the slides with your cheek cells on them should be
disposed of ____. - correct answer in the labeled container on the counter, cover slip
and all
What is elodea? - correct answer a plant that has leaves
