Biology help

Watch this thread
JustSomeoneAlone
Badges: 16
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#1
Report Thread starter 4 years ago
#1
Can someone explain what these are:

-Active transport
-Osmosis
-Diffusion

For the Edexcel higher paper please and in bullet points.
1
reply
Eleanorroseb
Badges: 10
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#2
Report 4 years ago
#2
all are substances going across a membrane

active transport:
- against concentration gradient (low -> high)

osmosis
- water going with the concentration gradient (high -> low)

diffusion
- same as osmosis but with non-water substances
- with concentration gradient (high -> low)

im doing Edexcel higher too so you also got to know
Channel proteins:
-Facilitated diffusion (high -> low, molecules need a little more help to cross a membrane)

Carrier proteins:
-Active transport (low -> high, requires energy) AND facilitated diffusion (same as channel)
0
reply
Hey_itsJerome
Badges: 15
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#3
Report 4 years ago
#3
Active Transport- consists of the movement of charged molecles and ions eg glucose and na+ etc it requires energy so needs atp therefore a mitchondria will be present somewhere. It also uses carrier proteins and use of channel proteins.
Osmosis is the movement of water through a partially permeable membrane
Water diffuses by Osmosis from a region ofhigh Water Potential to a region oflow Water Potential through the Water Potential Gradient. Osmosis can therefore be defined as the diffusion of water from a region of high Water Potential to a region of low Water Potential through a Partially Permeable Membrane.

Diffusion- is the net passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration.
0
reply
JustSomeoneAlone
Badges: 16
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#4
Report Thread starter 4 years ago
#4
(Original post by Hey_itsJerome)
Active Transport- consists of the movement of charged molecles and ions eg glucose and na+ etc it requires energy so needs atp therefore a mitchondria will be present somewhere. It also uses carrier proteins and use of channel proteins.
Osmosis is the movement of water through a partially permeable membrane
Water diffuses by Osmosis from a region ofhigh Water Potential to a region oflow Water Potential through the Water Potential Gradient. Osmosis can therefore be defined as the diffusion of water from a region of high Water Potential to a region of low Water Potential through a Partially Permeable Membrane.

Diffusion- is the net passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration.
thanks for the help
0
reply
JustSomeoneAlone
Badges: 16
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#5
Report Thread starter 4 years ago
#5
(Original post by Eleanorroseb)
all are substances going across a membrane

active transport:
- against concentration gradient (low -> high)

osmosis
- water going with the concentration gradient (high -> low)

diffusion
- same as osmosis but with non-water substances
- with concentration gradient (high -> low)

im doing Edexcel higher too so you also got to know
Channel proteins:
-Facilitated diffusion (high -> low, molecules need a little more help to cross a membrane)

Carrier proteins:
-Active transport (low -> high, requires energy) AND facilitated diffusion (same as channel)
ok thanks and good luck
0
reply
Eleanorroseb
Badges: 10
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#6
Report 4 years ago
#6
(Original post by JustSomeRandomer)
ok thanks and good luck
you too!!!
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest

How did The Student Room help you with your university application?

Talking to current university students (10)
19.61%
Talking to peers going through the same thing (16)
31.37%
Speaking to student ambassadors from the universities (3)
5.88%
Speaking to staff members from universities (0)
0%
Using the personal statement builder, library or helper service (6)
11.76%
Reading articles about what steps to take (12)
23.53%
Learning about/speaking to Student Finance England (2)
3.92%
Something else (tell us in the thread) (2)
3.92%

Watched Threads

View All