Exam (elaborations)
BLG 101 Chapter 3 EXAM QUESTIONS AND ANSWES
- Course
- Institution
BLG 101 Chapter 3 EXAM
[Show more]
Seller
Follow
DESTINYGRACE
Content preview
BLG 101 Chapter 3plasma membrane - answerA selectively-permeable phospholipid bilayer forming the
boundary of the cells
-barrier between separating intracellular fluid from extracellular fluid
membrane transport proteins - answerproteins in the plasma membrane allow the
transport of substances into and out of cells
receptor proteins - answera membrane protein that binds to signals outside the cell
-when bound the chemical messenger may cause a change in shape in the protein that
initiates a chain if chemical reactions
Enzymatic activity proteins - answerProtein's active site is exposed.
Once an enzyme activates, it a certain function is performed.
catalysizes reactions
cell-cell recognition - answersome glycoproteins serve as identification tags that are
specifically recognized by other cells
-says that that the cell is apart of the body so the body won't attack it
Attachment to the cytoskeleton and extracellular matrix - answer-elements of the
cytoskeleton and extracellular matrix
-helps maintain cell shapes, fixes the location of certain membrane proteins and plays a
role in cell movement
-anchors its self to its environment
Cell-Cell joining - answer-membrane in proteins of adjacent cells may be hooked
together in various kinds of intercellular joints
-some membrane protein of this group provide temporary binding sites that guide cell
migration and other cell to cell interactions
Cell Junctions - answertight junctions, desmosomes, gap junctions
tight junctions - answerMembranes of neighboring cells are pressed together,
preventing leakage of extracellular fluid
, - continuous seal
Desmosomes - answer-absorb shock
-allows a bit of give
-keeps cells from tearing apart
gap junctions - answerAllow molecules to pass directly from cell to cell.
passive transport - answerno energy required
active transport - answerenergy (atp) is required
types of passive transport - answersimple diffusion
facilitated diffusion
osmosis
- natural movement of molecules from high concentration to area off low concentration
Speed of diffusion is influenced by - answer-concentration
-molecules
-temperature
simple diffusion - answermovement of a solute from an area of high concentration to an
area of low concentration
Osmosis - answerDiffusion of water through a selectively permeable membrane
Osmolarity - answermeasure of total concentration of solute particles
Tonicity - answerthe ability of a solution to change shape or tone of cell by altering the
cell internal water volume
isotonic solution - answerhas same osmolarity as inside the cell, so volume remains
unchanged
hypertonic solution - answerhas higher osmolarity than inside cell, so water flows out of
cell, resulting in cell shrinking
hypotonic solution - answerA solution in which the concentration of solutes is less than
that of the cell that resides in the solution
two types of active membrane transport - answeractive transport and vesicular transport
both need ATP
antiporters - answertransport one substance into cell while transporting a different
substance out of cell
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 EFT, 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 this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller DESTINYGRACE. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R278,23. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
83637 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now