Question

Describe how proteins are used in active and passive transport. How do they differ?

Why does water need a protein channel to move across the cell membrane?

What is needed to fuel active transport? Where is this made in the cell?

Describe the prokaryotic and eukaryotic cells. What are the main similarities and differences?

Answer 1

That must be one big reply o.o

Answer 2

Proteins are used as channels. Because membranes are only semi-permeable, often a lot of molecules are to large to fit through the little gaps in the membrane. By having membranes wedged in the membrane, it gives a passage for certain molecules to get through. Any sort of passive transport will not require energy, so molecules will be able to pass through a channel without using energy. An example is during the Electron Transport Chain (ETC) in cellular respiration, when Hydrogen Ions move through ATP Synthase from a high concentration to a low concentration. Whereas in active transport, for example during the ETC in cellular respiration when the cell needs to get Hydrogen ions from the outside of the cell to the inside, proteins require energy to move these Hydrogen Ions across the membrane and against the concentration gradient.

At the current moment, I could not tell you why water requires protein, off the top of my head. My best guess would be so that the cell can move water from high concentration to low concentration?

The substance needed for cell energy is ATP, which is short form of Adenosine Triphosphate. This is created in the mitochondria, the energy center for the cell. It is created through the process of Cellular Respiration.

Prokaryotic Cells are often times said to be the cells that developed into Eukaryotic Cells. Prokaryotic cells are the single celled, 'simpler' organisms. An example would be an amoeba. Eukaryotic cells are cells that make up animal and plant cells. These are considered more 'advanced' than prokaryotic. Some of the main differences include:
Prokaryotics:
- Generally smaller in size
- DNA is kept in a region called the 'nucleoid'
- Contain no membrane bound organelles

Eukaryotes:
- Larger in size
- DNA is kept in the membrane bound 'nucleus'
- Contains many, large, membrane bound organelles

Both types have DNA.
Both have Ribosomes, there are differences, but they are still there.

These are the main similarities and differences!

Cheers!

Answer 3

https://www.google.com/url?url=http://www.youtube.com/watch%3Fv%3DVoW9czgQBqE&rct=j&sa=X&ei=cSR2UNyGE9Sk2gWzsYDYBg&ved=0CDkQuAIwAA&q=patrick+star+I+love+you&usg=AFQjCNEtxOfGh-cXIA9HxmeAPG1zs5WIJA

Answer 4

you. there. NOW.