Exam (elaborations)
BIOLOGY 101 Week 3 Discussion 1
- Course
- Institution
BIOLOGY 101 Week 3 Discussion 1
[Show more]
Seller
Follow
solutions
Reviews received
Content preview
Cell membranes are critical to the survival and function of all cells; they keep cells isolated fromthe external environment and from other cells. The plasma membrane is said to be differentially
or selectively permeable.
1. What does it mean for a membrane to be selectively permeable?
A membrane that is selectively permeable only allows certain substances to pass through.
(Simon, E.J., J.L. Dickey and J.B. Reece. 2013, pg 84) A cell is a living thing and needs
just the right balance of nutrients and water, called homeostasis. The selective
m
er as
permeability of the membrane allows the cell to stay in homeostasis. The components
co
eH w
that make up the cell membrane allow it to be selectively permeable. The cell membrane
o.
rs e
is made of proteins and a special type of fat called phospholipids . The phospholipids
ou urc
form a bilayer, or double layer. A phospholipid has two parts: the head, which likes water
o
(hydrophilic) and the tail, which doesn't like water (hydrophobic). The phospholipid tails
aC s
vi y re
come together, protecting themselves from the water, leaving the heads on the outside.
2. Select two specific components of the cell membrane and explain how each affects the
ed d
ar stu
permeability of the cell membrane. Meaning, what specific materials are regulated by the
given component and how.
is
Th
Carbohydrates and the phospholipid bilayer are two specific components of the cell
membrane that affect the permeability of the cell membrane. Carbohydrates attach to
sh
proteins and lipids creating glycocalyx. Glycocalyx adds to the protective layer of the cell
membrane and also serves as a recognition mechanism. It acts as a glue to attach cells
together.
This study source was downloaded by 100000805705997 from CourseHero.com on 11-03-2021 21:16:27 GMT -05:00
https://www.coursehero.com/file/17581905/Biology-Week-3-Discussion-1/
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 solutions. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $2.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67163 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now