[i] This is a beta test version of a program we’re developing. In the final version, we’ll have a timer. For now, get a stopwatch. When you’re ready, start timing, and click “start.” Then click on the indicated parts (or their numbers) as quickly and accurately as you can. When you’ve answered all the questions, note how long it took you.
[q] Click on the part or the number of the part.
Selectively permeable boundary of the cell
Nice! The membrane (at 2) is the cell’s selectively permeable boundary.
No. You’re looking for the cell membrane, which is between the cell wall and the cytoplasm
The enzyme-rich fluid inside the cell
Awesome. The cytoplasm (3) is the enzym e-rich fluid inside the cell.
No. You’re looking for the fluid that’s inside the membrane, holding all of the organelles.
A plant cell’s major storage compartment.
Nice job. The central vacuole is a plant cell’s major storage compartment.
No. Look for a very large, membrane-bound organelle that takes up most of the cell’s volume.
A structural boundary, mostly made of cellulose
Nice job. The cell wall is a structural boundary, mostly made of cellulose.
No. You’re looking for the cell wall (the outermost part of a plant cell).
ATP secreting organelle.
Good work. The mitochondria take food energy and secrete ATP.
No. You’re looking for the mitochondria, which look like little cells with a very wavy internal membrane.
A packaging and sorting center for proteins.
Good work! The Golgi complex is the cell’s protein packaging and sorting center.
No. You’re looking for the Golgi complex, which looks like a stack of flattened sacs of membrane.
Makes proteins and lipids for organelles or export.
Nice job. The endoplasmic reticulum makes proteins and lipids.
No. You’re looking for the E.R. Its just outside of the nucleus.
Stores genetic information
Excellent. The chromosomes (8) store genetic information.
No. You’re looking for chromosomes, which are inside the nucleus.
Controls what enters and leaves the nucleus
Good! The nuclear membrane (9) controls what enters and leaves the nucleus.
No. You’re looking for the nuclear membrane.
Creates sugars through photosynthesis
Terrific. Chloroplasts create sugars through photosynthesis.
No. You’re looking for chloroplasts.
[q] Click on either the number or the cell part.
No. The chromosomes are shown inside the nucleus. They’re shown in their X-shaped mitotic form.
No. Look for a stack of flattened sacs in the cytoplasm
No. The membrane is the selectively permeable outer boundary of the cell.
No. The cytoplasm is the fluid that fills the inside of the cell.
No. The mitochondria are like tiny cells within the cell. And they have a very wavy internal membrane.
No. You’re looking for a network of channels, but without ribosomes.
No. Look for a network of channels with embedded ribosomes.
No. Look in the cytoplasm, and find a part that looks like two short arrays of tubes oriented at about 90 degrees from one another.
[q] Click on the part or the number.
Nice. The nucleus is where you’ll find DNA/genetic information.
No. You’re looking for the nucleus.
Site of protein synthesis
Excellent. The rough ER is the site of protein synthesis.
No. You’re looking for the rough E.R. This is E.R. with ribosomes.
site of lipid synthesis
Good! The smooth E.R. is the site of lipid synthesis
No. You’re looking for the smooth E.R. This is E.R. without ribosomes.
Vesicle from E.R. to Golgi
Awesome. That vesicle is moving from the E.R. to the Golgi.
No. Find a vesicle that’s in between the E.R. and the Golgi.
Packaging and processing of proteins for export
Terrific. The Golgi is where protein packaging and processing occurs.
No. You’re looking for the Golgi apparatus.
Outbound vesicles leaving the Golgi
Good work. That’s a vesicle leaving the Golgi.
No. First find the Golgi. Then find a vesicle that seems to be leaving the Golgi, heading away from the nucleus.
The most likely candidate for a lysosome.
Nice! If anything on this diagram is going to be a lysosome, it’s # 7.
No. Find a large, membrane-bound organelle that’s not a vesicle, or ER, or Golgi .
Awesome! That’s exocytosis.
No. Find where a vesicle is fusing with the membrane and dumping its contents outside of the cell.
Nice. The hydrophilic head is at 1.
No. Look for the part of the molecule that has a phosphate group.
Nice. Glycerol is at number 2.
No. Look for a 3 carbon molecule that’s holding connecting the fatty acid tails to the phosphate bearing head.
Way to go. The hydrophobic tails are at “3.”
No. You’re looking for two long hydrocarbon chains.
Saturated fatty acid
Nice. It’s the straight hydrocarbon chain
No. You’re looking for the straight hydrocarbon chain (no double bonds)
Unsaturated fatty acid
Nice. An unsaturated fatty acid would have at least one double bond.
No. You’re looking for a fatty acid chain with at least one double bond.
Nice. The phosphate groups has a phosphorus atom surrounded by oxygens.
No. Look for a phosphorus atom surrounded by oxygens (with a negative charge)
[q] In this diagram, click on the NUMBERS.
Maintains membrane fluidity
Excellent! Cholesterol maintains fluidity
No. You’re looking for cholesterol. it’s a steroid, made of fused carbon rings.
Nice job. Number 6 represents a membrane channel.
No. Look for something that spans the width of the membrane, and looks like a tunnel.
Involved in cell recognition
Nice. “8” is a membrane carbohydrate, involved in cell recognition.
No. Look for the number of what looks like a polysaccharide jutting out of the membrane.
A phospholipid head
Nice! “9” represents the head of a phospholipid.
No. A phospholipid is represented by a red sphere and two tails. Figure out which part must be the “head.”
Excellent. Both of the proteins at “1” are trans-membrane proteins
No. Look for proteins that span the entire phospholipid bilayer.
Nice! “2” represents the phospholipid bilayer.
No. Look for a double layer of phospholipids, arranged “heads out, tails in”
Awesome. “3” is a peripheral protein.
No. You’re looking for a protein that’s attached to the phospholipid heads.
[q] Click on the number or the process.
Way to go. In simple diffusion, molecules diffuse right across the bilayer.
No. In simple diffusion, molecules diffuse right across the bilayer.
Good work. “2” represents facilitated diffusion.
No. In facilitated diffusion, molecules diffuse by means of a protein channel.
Terrific. “3” represents active transport.
No. Which scenario shows molecules moving up their concentration gradient? That’s active transport.
[q] Click to indicate what kind of ENVIRONMENT the cell is in.
Excellent. The cell shriveled up because its water flowed into its hypertonic environment.
No. Remember that water flows from hypotonic to hypertonic. A cell in a hypertonic environment will lose water.
Good work. When a cell is in an isotonic environment, water moves in and out at the same rate.
No. When a cell is in an isotonic environment, water moves in and out at the same rate.
Nice job! When an animal cell is in a hypotonic environment, water will flow into the cell, causing it to swell and burst.
No. When an animal cell is in a hypotonic environment, water will flow into the cell.
How did you do? Click restart and start your stopwatch to improve your performance.