conclusion and analysis:
1. it is important that you understand the steps in the extraction procedure and why each step was necessary. each step in the procedure aided in isolating the dna from other cellular materials. match the procedure with its function:
procedure
a. filter strawberry slurry through coffee filter
b. mush strawberry with extraction buffer
c. initial smashing and grinding of strawberry
d. addition of ethanol to filtered extract
function
to precipitate dna from the solution
separate components of the cell
break open the cells
break up proteins and dissolve cell membranes
2. what did the dna look like?
3. explain what happened when the alcohol came in contact with the strawberry extract?
4. a person cannot see a single cotton thread 100 feet away, but if you wound thousands of threads all together with a rope, it would be visible much farther away. is this statement analogous to our dna extraction? explain.
5. in order to study human genes, scientists must first extract the dna from human tissues. would you expect the method of dna extraction for human dna to be the same as the method you used to extract dna from strawberries? why or why not?
6. list of materials used in lab.

Question

conclusion and analysis:
1. it is important that you understand the steps in the extraction procedure and why each step was necessary. each step in the procedure aided in isolating the dna from other cellular materials. match the procedure with its function:
procedure
a. filter strawberry slurry through coffee filter
b. mush strawberry with extraction buffer
c. initial smashing and grinding of strawberry
d. addition of ethanol to filtered extract
function
 to precipitate dna from the solution
 separate components of the cell
 break open the cells
 break up proteins and dissolve cell membranes
2. what did the dna look like?
3. explain what happened when the alcohol came in contact with the strawberry extract?
4. a person cannot see a single cotton thread 100 feet away, but if you wound thousands of threads all together with a rope, it would be visible much farther away. is this statement analogous to our dna extraction? explain.
5. in order to study human genes, scientists must first extract the dna from human tissues. would you expect the method of dna extraction for human dna to be the same as the method you used to extract dna from strawberries? why or why not?
6. list of materials used in lab.

Accepted Answer

### Question 1: Matching Procedure with Function
#### Brief Explanations:
- **A. Filter strawberry slurry through coffee filter**: Filters separate solid and liquid components (e.g., cell debris from liquid extract) → *separate components of the cell*.
- **B. Mush strawberry with extraction buffer**: The buffer and mashing break cell membranes/proteins and rupture cells → *break up proteins and dissolve cell membranes* (buffer helps, mashing breaks cells).
- **C. Initial smashing and grinding of strawberry**: Physical grinding breaks cell walls open → *break open the cells*.
- **D. Addition of ethanol to filtered extract**: Ethanol is used to precipitate DNA (DNA is insoluble in alcohol) → *to precipitate DNA from the solution*.

#### Answer:
- A: separate components of the cell
- B: break up proteins and dissolve cell membranes
- C: break open the cells
- D: to precipitate DNA from the solution

### Question 2: What did the DNA look like?
#### Brief Explanations:
In strawberry DNA extraction, DNA appears as a **cloudy, stringy, slimy (or “snot-like”) white/clear substance** (matching the handwritten note “clear slimy snot”). It clumps together due to precipitation.

#### Answer:
The DNA looked like clear, slimy (or “snot-like”), stringy material (often clumped or web-like).

### Question 3: Explain what happened when the alcohol came in contact with the strawberry extract?
#### Brief Explanations:
DNA is soluble in water (strawberry extract is aqueous) but **insoluble in alcohol** (ethanol). When ethanol is added, it causes DNA to *precipitate* (clump together) out of the solution. This appears as stringy, white/slimy strands forming in the alcohol layer (or at the interface).

#### Answer:
When alcohol (ethanol) contacted the strawberry extract, DNA precipitated out of the solution (since DNA is insoluble in alcohol). It formed stringy, slimy clumps (or a web-like substance) as the alcohol caused the dissolved DNA to aggregate and become visible.

### Question 4: Analogy to DNA Extraction
#### Brief Explanations:
- A single cotton thread (like a single DNA molecule) is too small to see from far.
- Winding thousands of threads into a rope (like DNA clumping/precipitating into visible strands during extraction) makes it large enough to see.
- In DNA extraction, individual DNA molecules are invisible, but when precipitated (clumped) by alcohol, they form visible strands—similar to the thread rope becoming visible.

#### Answer:
Yes, the statement is analogous. A single DNA molecule is too small to see, but during extraction, many DNA molecules clump (precipitate) together (like thousands of threads forming a rope). This clumped DNA becomes visible, just as the rope of threads is visible from far, while a single thread is not.

### Question 5: DNA Extraction Method for Humans vs. Strawberries
#### Brief Explanations:
- **Similarities**: Both human and strawberry cells have DNA in nuclei. The *basic principles* (cell lysis, protein breakdown, DNA precipitation) are the same (e.g., using buffers, lysis, alcohol precipitation).
- **Differences**: Human tissues (e.g., cheek cells, blood) may require different lysis methods (e.g., enzymes for blood cells) or buffers, but the core steps (lysis, precipitation) are analogous.
- **Conclusion**: The *method would be similar* because all cells (human or strawberry) store DNA in nuclei, and the chemical properties of DNA (solubility in water, insolubility in alcohol) are universal. Minor adjustments (e.g., tissue type, lysis enzymes) might be needed, but the overall process (lyse cells, remove proteins, precipitate DNA) is comparable.

#### Answer:
The method of DNA extraction for human DNA would be **similar** to the strawberry method. Both human and strawberry cells contain DNA in nuclei, and DNA has the same chemical properties (soluble in water, insoluble in alcohol). Core steps (cell lysis, protein breakdown, DNA precipitation with alcohol) rely on universal DNA behavior. Minor changes (e.g., lysis for human tissue type) might occur, but the overall process (lyse cells, isolate DNA, precipitate with alcohol) is analogous.

### Question 6: List of materials used in lab (Strawberry DNA Extraction)
#### Brief Explanations:
Typical materials for strawberry DNA extraction include:
- Strawberries
- Extraction buffer (e.g., soap, salt, water)
- Coffee filter (or filter paper)
- Beaker/container
- Ethanol (rubbing alcohol, chilled)
- Mortar and pestle (or spoon for mashing)
- Test tube (or cup)
- Pipette/dropper

#### Answer:
Example materials:
- Strawberries
- Extraction buffer (soap, salt, water mixture)
- Coffee filter
- Beaker/container
- Ethanol (chilled)
- Mortar and pestle (or spoon)
- Test tube/cup
- Pipette/dropper
- Graduated cylinder (for measuring)
- Funnel (optional, for filtering)

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QUESTION IMAGE

Question

Explanation:

Question 1: Matching Procedure with Function

Answer:

Question 2: What did the DNA look like?