Exam (elaborations)
BIOLOGY 123 EXAM 1 2024//BIOLOGY 123 EXAM 1 WITH COMPLETE SOLUTION
- Course
- Institution
BIOLOGY 123 EXAM 1 WITH COMPLETE SOLUTION
[Show more]
Content preview
BIOLOGY 123 EXAM 1 WITHCOMPLETE SOLUTION
[Document subtitle]
[DATE]
[COMPANY NAME]
[Company address]
,Light Microscopes (LM)
The first microscopes visible as light passes through. Can magnify up to 1000X.
Electron Microscope
Uses a beam of electrons. Can magnify up to 100,000X.
Scanning electron Microscope (SEM)
Studies the detailed architecture of cell surfaces. Specimen must be coated in gold. Occurs in a vacuum.
Transmission Electron Microscope (TEM)
Study the details of internal cell structure. Specimen must be coated in gold. Occurs in a vacuum.
Cell size must
be large enough to house DEA, proteins and structures needed to survive and reproduce. However, must
remain small enough to allow for a surface to volume ratio that will allow adequate exchange with the
environment.
Plasma Membrane
forms a boundary between inside and outside a cell.
Phospholipids form a two-layer sheet called a phospholipid bilayer, what are they?
Hydrophilic - heads face outward (surrounded by water)
, Hydrophobic - tails point inward (towards each other)
Where are membrane proteins embedded
In the lipid bilayer.
What other functions do membrane proteins have?
Some form channels that shield ions and other hydrophilic molecules as they pass through the
hydrophobic center of the membrane.
Others serve as a pump to transport molecules into or out of the cell.
Prokaryotic cells are
Smaller and simpler in structure. Does not have a membrane that surrounds the DNA. DNA is coiled into
the nucleoid.
Eukaryotic cells
are distinguished by having a membrane enclosed organelles.
Cytosol
Interior filling of a cell which is a thick, jellylike fluid
What does a Eukaryotic cell contain?
a membrane enclosed nucleus, various other organelles (little organs) performing specific functions.
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 CERTIFIEDNURSE. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $20.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
73314 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now