Exam (elaborations)
Straighterline-BIO 201L-Lab 4 Diffusion and Osmosis 2022
- Course
- Institution
Straighterline-BIO 201L-Lab 4 Diffusion and Osmosis
[Show more]
Seller
Follow
CHRISJAYfiles
Reviews received
Content preview
Lab 4 Diffusion and Osmosis BIO201LGlucose
Test n/a n/a Greenish No change
Strip
Table 4: Diffusion of Starch and Glucose Over Time
Indicator Dialysis Bag After 1 Hour Beaker Water After 1 Hour
IKI Solution changed to blue/black in color iodine passed- changed to yellow
Glucose Test Strip pale brownish brown
Post-Lab Questions
”1. Why is it necessary to have positive and negative controls in this experiment? ”
It is important to show that the indicator reagent and the starch and glucose used are
not faulty.
”2. Which substance(s) crossed the dialysis membrane? Support your response with
data-based evidence. ”
Dialysis tubing is a absorptive membrane, the water can pass through it, but not salt.
”3. Which molecules remained inside of the dialysis bag?
Blood cells and larger molecule proteins.
”4. Did all of the molecules diffuse out of the bag into the beaker? Why or why not? ”
Starch didn’t diffuse out . Starch molecules are to big to fit through the absorptive
membrane. Most of glucose dispersed out of the bag.
Experiment 3: Osmosis - Direction and Concentration Gradients
”Hypothesis: If we have two solutions with one being a higher concentration of
solvent that the other, the osmosis would go from the higher solvent to the lower
solvent.
Table 6: Sucrose Concentration vs. Tubing Permeability
Band Initial Volume Net Displacement
Sucrose % Final Volume (mL)
Color (mL) (mL)
Yello
30 10 16 6
w
Red 15 10 13 3
This study source was downloaded by 100000836551366 from CourseHero.com on 03-03-2022 07:03:10 GMT -06:00
https://www.coursehero.com/file/38660268/Lab4-dragged-2pdf/
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller CHRISJAYfiles. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $0.00. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
83100 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now