what is the formula for resistors in series vs in parallel
in series: add R= R1 +R2..
in parallel: 1/R= 1/R1+ 1/R2...
What is Ohm's law equation?
V=IR
Previous
Play
Next
Rewind 10 seconds
Move forward 10 seconds
Unmute
0:02
/
0:15
Full screen
Brainpower
Read More
what...
what is the formula for resistors in series vs in parallel - ANSWER- in series: add
R= R1 +R2..
in parallel: 1/R= 1/R1+ 1/R2...
What is Ohm's law equation? - ANSWER- V=IR
what is the formula for capacitors in series vs in parallel - ANSWER- in series: 1/C
= 1/C1 + 1/C2..
in parallel= C= C1 +C2..
what kind of molecules can pass the cell membrane lipid bilayer most easily?
Which have the hardest time diffusing through? - ANSWER- small hydrophobic
molecules > small uncharged polar molecules > large uncharged polar molecules
> charged molecules (ions)
where does capacitance come from in the cell? - ANSWER- the lipid bilayer:
proteins, ion transporters
does adding more membrane layers increase or decrease capacitance? -
ANSWER- decrease
what components of the membrane are responsible for resistance? - ANSWER-
the ion channels
What is the hydrophobic effect? - ANSWER- The exclusion of non polar
substances from an aqueous solution. Nonpolar molecules aggregate to avoid
contact with hydrophilic molecules, particularly water.
, -polar molecules are more attracted to the dipoles of each other than non polar
and thus exclude the non polar molecules (makes them arrange in a specific
manner)
what is the physical basis for the hydrophobic effect? - ANSWER- the second law
of thermodynamics: ENTROPY of a system wants to increase (occurs when water
molecules interact with each other and exclude the non polar molecules)
order the following molecules with respect to their ability to cross a membrane:
glucose, water, NO, Na+, ETOH, RNA - ANSWER- NO, ETOH, water, glucose, Na+,
RNA
what are the 2 factors that determine whether a molecule can cross a membrane?
which one is more important? - ANSWER- 1) charge (polarity)
2) size
what are the 3 basic membrane transport protein types? which are faster
compared to the other? - ANSWER- 1) ATP powered pumps
2) Ion channels (either open or closed and allow ions to flow down their M
gradients)
3) Transporters
-generally 1 and 2 are faster than 3
what are the 3 types of membrane transporters - ANSWER- 1) uniporter: only 1
molecule in 1 direction
2) symporter: 2 molecules in the same direction
3) antiporter: 2 molecules in opposite directions
for symporters/antiporters, what kind of transport are they/ what supplies the
energy - ANSWER- in both, 1 molecule moves down its M gradient, which
supplies the energy needed to transport the other molecule against its gradient
-both passive and active
think about the graph plotting initial rate of uptake and concentration? which is
fastest/ slowest? - ANSWER- fastest= diffusion
ion channels
transporters
slowest= ion pumps
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 tuition. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
