Exam 1- Chapters 1-6 - Results
Attempt 1 of 1
Written Mar 26, 2026 1:37 PM - Mar 26, 2026 2:15 PM
Released Apr 3, 2026 11:55 PM
95.6
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95.6
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Question 1 2..5 points
Buffers are important for doing experiments in labs, but they are not
relevant to living systems.
Question options:
True
False
Question 2 2..5 points
Estrogen and testosterone are structurally related to cholesterol. Based on
what you have learned about cholesterol, predict how these steroid
hormones signal to the cell.
Question options:
They are phagocytosed, degraded, and then released into the cell.
They diffuse directly through the plasma membrane and into the cell.
They bind to receptors on the outside of the membrane, which then activate an intr
cascade.
They make the membrane so fluid that small pores appear, allowing them to pass th
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Question 3 2..5 points
How are the membrane components oriented?
Question options:
The hydrophobic heads are oriented towards the outside of the cell and the hydroph
towards the inside of the cell.
The hydrophilic heads are oriented towards the outside and the inside of the cell an
tails are oriented towards each other.
The hydrophobic heads are oriented towards each other and the hydrophilic tails ar
the outside and inside of the cell.
The hydrophobic heads are oriented towards the inside of the cell and the hydrophi
towards the outside of the cell.
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Question 4 2..5 points
When the solute concentration in solution 1 is lower than the solute
concentration in solution 2, solution 2 is
Question options:
isotonic
hypotonic
hypertonic
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Question 5 2..5 points
If two solutions are different, the one with the higher concentration of
solutes is:
Question options:
isotonic
hypertonic
hypotonic
Question 6 2..5 points
The NASA Mars rover has found evidence of water on Mars. This opens the
possibility that life may have existed on another planet, perhaps evolving
completely independently.
“Just think!” says your friend, “Extraterrestrial cells might be totally
different than Earth cells. For example, the plasma membranes might be
inside out, with the polar heads on the inside and the tails on the outside!”
What is your response?
Question options:
"Since the gravity is much lower on Mars, that reduces the constraints on cell size
be much bigger – but still with the charged heads on the outside."
"That seems unlikely, since if a cell is in a watery environment, and has a watery cy
head groups will still be most stable on the outside rather than pushed together."
"Yes, anything we've learned about how Earth cells work is unlikely to be the same
independently."
"Well that happens in specialized cells on Earth too. For instance, adipocytes have t
membranes."
Attempt 1 of 1
Written Mar 26, 2026 1:37 PM - Mar 26, 2026 2:15 PM
Released Apr 3, 2026 11:55 PM
95.6
Attempt Score
%
95.6
Overall Grade (Highest Attempt)
%
Question 1 2..5 points
Buffers are important for doing experiments in labs, but they are not
relevant to living systems.
Question options:
True
False
Question 2 2..5 points
Estrogen and testosterone are structurally related to cholesterol. Based on
what you have learned about cholesterol, predict how these steroid
hormones signal to the cell.
Question options:
They are phagocytosed, degraded, and then released into the cell.
They diffuse directly through the plasma membrane and into the cell.
They bind to receptors on the outside of the membrane, which then activate an intr
cascade.
They make the membrane so fluid that small pores appear, allowing them to pass th
Hide question 2 feedback
,Feedback
Correct
Question 3 2..5 points
How are the membrane components oriented?
Question options:
The hydrophobic heads are oriented towards the outside of the cell and the hydroph
towards the inside of the cell.
The hydrophilic heads are oriented towards the outside and the inside of the cell an
tails are oriented towards each other.
The hydrophobic heads are oriented towards each other and the hydrophilic tails ar
the outside and inside of the cell.
The hydrophobic heads are oriented towards the inside of the cell and the hydrophi
towards the outside of the cell.
Hide question 3 feedback
Feedback
Correct
Question 4 2..5 points
When the solute concentration in solution 1 is lower than the solute
concentration in solution 2, solution 2 is
Question options:
isotonic
hypotonic
hypertonic
Hide question 4 feedback
, Feedback
Correct
Question 5 2..5 points
If two solutions are different, the one with the higher concentration of
solutes is:
Question options:
isotonic
hypertonic
hypotonic
Question 6 2..5 points
The NASA Mars rover has found evidence of water on Mars. This opens the
possibility that life may have existed on another planet, perhaps evolving
completely independently.
“Just think!” says your friend, “Extraterrestrial cells might be totally
different than Earth cells. For example, the plasma membranes might be
inside out, with the polar heads on the inside and the tails on the outside!”
What is your response?
Question options:
"Since the gravity is much lower on Mars, that reduces the constraints on cell size
be much bigger – but still with the charged heads on the outside."
"That seems unlikely, since if a cell is in a watery environment, and has a watery cy
head groups will still be most stable on the outside rather than pushed together."
"Yes, anything we've learned about how Earth cells work is unlikely to be the same
independently."
"Well that happens in specialized cells on Earth too. For instance, adipocytes have t
membranes."
