NGSS HS-LS1-1, HS-LS1-2 CCC: Stability and Change DCI LS1.A
100 total points
Multiple Choice are worth 3 pts each.
NGSS HS-LS1-1, HS-LS1-2 CCC: Stability and Change DCI LS1.A
100 total points
Multiple Choice are worth 3 pts each.
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Question 9
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Question 10
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Question 11
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Question 12
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The phospholipid's __________ region keeps water molecules at bay.
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Question 16
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CCC: Cause and effect/Patterns: Mechanisms and explanation.
You are presented with two images: Image A shows a wilted plant, and Image B shows the same plant after being watered, now appearing vibrant and upright.
a. Using these images as a visual guide, explain the cellular process by which adding water to the plant in Image A results in the revitalization seen in Image B. Your explanation must incorporate how water affects the plant cells, specifically referencing the concept of osmosis and the role of the central vacuole and cell wall.
b. How does this same water process, the one you talked about in part A, make other things happen in nature that you can see? Give a couple of examples.
Question 17
17.
PE: Cell Transport
Scenario: Imagine three containers, called beakers, each holding salty water. One has a little salt (2%), another has a medium amount (10%), and the third has a lot of salt (30%). In each beaker, there's a tiny fake cell. These fake cells have a special skin (membrane) that lets water in and out, but it won't let salt pass through. The water inside each fake cell starts at 10% salt.
a. How Salty is the Water Around the Cell Compared to Inside? (3 points)
For each beaker, tell whether the salty water outside the "cell" is more salty, less salty, or just as salty as the water inside the "cell." Use these words: "hypertonic" (more salty), "hypotonic" (less salty), or "isotonic" (just as salty).
b. Where Will the Water Go? (3 points)
Explain why and how water will move. Will it go into the "cell" or out of the "cell"? You can draw arrows to show the direction of the water's movement.
c. What Will Happen to the Cell's Size? (3 points)
Tell us if the "cell" will get bigger, smaller, or stay the same size in each beaker.
Question 18
18.
CER: Claim, Evidence, and Reasoning:
The cell membrane is like a gatekeeper for every living cell. It's a vital part that controls what goes in and out. Because it's selectively permeable, it only lets certain things pass through, keeping others out. This ability to choose what enters and exits is super important for keeping the cell's inside just right.
The cell membrane also uses proteins to help things move across. This process, called facilitated diffusion, is like having special doorways that specific molecules can use to get in. This clever system makes sure the cell gets the nutrients it needs to work correctly and stay healthy.
Question:
Would sodium need a protein channel for facilitated diffusion?
Make a CLAIM by answering the above question. (3 pts)
What facts or information did you use to support your answer? Be sure to include at least three specific examples from the table. (6 pts)
Now, explain why the evidence you listed helps prove your claim. Use your evidence to show how and why sodium would need facilitated diffusion and a protein channel. It's a good idea to compare it to other situations or molecules. (6 pts)
See the rubric to ensure you get the greatest amount of points for your answer.
A key property of cell membranes is selective permeability. This enables them to:
allow some substances to enter or leave a cell more easily than others.
allow anything can pass into or out of a cell as long as the membrane is intact and the cell is healthy.
have cell membranes that are very thick.
deny glucose to enter the cell ever.
What's the name for water moving through a selectively permeable membrane?
Diffusion
Osmosis
Active transport
Facilitated diffusion
When a cell is in an isotonic solution, how does it maintain its internal balance (homeostasis)?
Equilibrium will be established as water molecules cross the cell membrane at an equal rate in both directions.
Water will reach equilibrium and stop moving across the cell membrane
Water will move across the cell membrane and into the cell
Water will move across the cell membrane and go out of the cell
Given that all cells have cell membranes, what describes their composition and function?
The cell membrane is composed of cellulose, which provides flexibility for the cell.
The cell membrane is a phospholipid bilayer, which allows specific types of molecules to move in and out of the cell.
The cell membrane is composed of sugar molecules, which provides a rigid structure.
The cell membrane is composed of cytoplasm, which allows proteins to be excreted by the cell.
According to the fluid mosaic model, the plasma (cell) membrane is composed of...
two layers of phospholipids with cholesterol sandwiched between them.
carbohydrates in a single layer of phospholipids.
a phospholipid bilayer containing many different proteins.
solely two layers of phospholipids.
David's science class is doing a lab on cell transport. He puts some red blood cells into a beaker that's 90% water and watches them under a microscope. What's the most likely change David will see in the cells?
Water moves out of the cells by osmosis causing the cells to shrink
Water moves into and out of the cells equally so that the cells stay the same size
Water moves into the cell membrane where it becomes trapped and cannot enter the cell
Water will move into the cells by osmosis causing the cells to eventually burst
Protein channels are a key component of the cell membrane's phospholipid structure. Explain why their presence is absolutely essential for facilitated diffusion to occur.
The protein channels allow enzymes to only move into the cell and not out.
Protein channels are selective, permitting the passage of certain molecules based on their molecular size.
The protein channels prevent the cell membrane from breaking apart in a hypotonic solution.
The protein channels connect the cell wall to the cell membrane in plants.
Membrane phospholipids
Are able to drift within the plasma membrane.
do not exhibit movement within the membrane.
have hydrophilic tails that face outward and are exposed to water.
have hydrophobic heads that face the center and are shielded from water.
A researcher found a mysterious green slime in a pond and observed it under a microscope.
What visual evidence from the microscopic image of the slime would help the scientist determine if it is a living organism or a non-living substance?
The oxygen molecule is visible inside the slime.
Carbon dioxide the largest component of the slime.
The slime contains cells.
The slime contains many carbon molecules.
In her cell transport experiment, Susan made a salt and water solution to observe how molecules move in and out of a potato cell. Which component of her solution is the solute?
potato
water
solution
salt
How is equilibrium achieved during osmosis?
Equilibrium is reached when the cell bursts due to osmotic forces
Equilibrium is reached when the cell gains water endlessly
Equilibrium occurs when the solute concentration becomes isotonic..
Equilibrium means there osmosis is not occurring
Identify the correct statement regarding passive transport.
Passive transport can never reach equilibrium.
Passive transport does not include diffusion.
Passive transport operates independently of concentration.
Passive transport requires no cell energy.
Osmosis refers to the...
the diffusion of a solute.
active transport.
the diffusion of water.
the diffusion of nonpolar molecules.
Why does an animal cell burst in tap water, while a plant cell remains intact?
Due to the central vacuole's water release.
Due to the fact that animal cells do not need water.
Due to the fact that plant cells' membranes don't allow water to enter.