1. Gated ion channels: (multiple choice)
A) Opens only when there is a 104 difference in ion concentration across a membrane.
B) Requires an input of energy to transport an ion across a membrane.
C) Generates an ion gradient.
D) Can transport any type of positive ion through the same channel.
E) All of the above are false.
True of False
2. Archaebacteria, many of which live in extreme environments such as deep sea vents, are more closely related to Eukaryote cells than are Eubacteria such as E. coli, which live in the human gut.
explain both of these please
1. Gated ion channels: (multiple choice)
A) Opens only when there is a 104 difference in ion concentration across a membrane.
B) Requires an input of energy to transport an ion across a membrane.
C) Generates an ion gradient.
D) Can transport any type of positive ion through the same channel.
E) All of the above are false.
True of False
2. Archaebacteria, many of which live in extreme environments such as deep sea vents, are more closely related to Eukaryote cells than are Eubacteria such as E. coli, which live in the human gut.
explain both of these please
Related textbook solutions
Related questions
Cellular biology answer check. please check if my answers arecorrect or not.
1) The concentration of ions inside a cell is the same as theirconcentration outside of the cell. True or false? (i chose falsesince having equilibrium inside a cell is bad)
2) Membrane transport proteins...
| a)...transport membrane potentials between cells |
| b) | ...transport membranes from the ER to the Golgi |
| c) | ...are made up of phospholipids |
| d) | ...transport molecules across membranes |
i chose d
3)The electrochemical gradienttakes into account:
| a) | The concentration of solutes on either side of themembrane. |
| b) | The overall charge on either side of the membrane. |
| c) | Both of these. |
i chose C. (although i am sure that overall charge matters, Iwasn't sure if concentration of solutes are taken account.)
4) If no energywere expended by an animal cell:
| a) | Both gradients would be depleted |
| b)The K+ gradient would maintain itself. |
| c) | None of these |
| d) | The Na+ gradient would maintain itself. |
I chose d) mainly because I think Na+ gradient exist in animalcell and not K+ gradient.
5) Which of the following is a true statement aboutactin?
| a) | Once actin has polymerized, it never depolymerizes. |
| b) | Actin is a transmembrane protein. |
| c) | Actin can form branched networks. |
| d) | Actin filaments are organized into hollow tubes. |
I chose c. can't explain why.
6)Ion channels:
| a) | Form a hydrophobic channel through the membrane |
| b) | Have filters that let sugars through |
| c) | Are selective for particular ions (only the |
