3. In an aqueous environment, the phospholipids of a membrane____.
a) are arranged in a single layer
b) are arranged in a bilayer with the polar heads of each layerlocated at the surface
c) are arranged in a bilayer with the fatty acid tails locatedat the surface
d) are arranged in a bilayer but the phospholipids have nospecific orientation
e) dissolve
4. which of the following molecules demonstrate dual solubilitycharacteristics
a) sterols only
b) proteins only
c) phospholipids only
d) sterols and phospholipids
e) sterols, phospholipids, and proteins
5. The "mosaic" part of the fluid mosaic model refers to themembrane ____.
a) proteins
b) phospholipids
c) cholesterol
d) functions
e) layers
9. Transport of a molecule across a cell membrane by facilitateddiffusion ____.
a) does not exhibit specificity for a particular type ofmolecule
b) requires the input of energy
c) depends on a concentration gradient
d) goes against the concentration gradient
e) allows non-polar uncharged molecules to diffuse across amembrane
13. A transport system in which transport of an ion in onedirection provides the energy for active transport in the oppositedirection is known as ____.
a) primary active transport
b) active diffusion
c) secondary active transport
d) cotransport
e) osmosis
14. Cells undergo exocytosis ____.
a) to pump protons down a concentration gradient
b) when replicating
c) to secrete protein and wastes from the cell
d) to ingest nutrients
e) as a means of cellular protection
15. What is the molecular basis of familialhypercholestremia?
a) HDL enters cells using a specific receptor on the cellsurface
b) LDL enters cells using a specific receptor on the cellsurface
c) HDL exits cells using a specific receptor on the cellsurface
d) LDL exits cells using a specific receptor on the cellsurface
e) receptor-mediated exocytosis
16. Carrier molecules are utilized for ____.
a) active transport only
b) passive transport only
c) both active and passive transport
d) osmosis
e) transport of all types of molecules
17. All of the following are functions of integral membraneproteins EXCEPT ____.
a) transport of polar molecules
b) reception of chemical signals form other cells
c) cell division
d) recognition of other cells as being "like"
e) cell-cell binding
3. In an aqueous environment, the phospholipids of a membrane____.
a) are arranged in a single layer
b) are arranged in a bilayer with the polar heads of each layerlocated at the surface
c) are arranged in a bilayer with the fatty acid tails locatedat the surface
d) are arranged in a bilayer but the phospholipids have nospecific orientation
e) dissolve
4. which of the following molecules demonstrate dual solubilitycharacteristics
a) sterols only
b) proteins only
c) phospholipids only
d) sterols and phospholipids
e) sterols, phospholipids, and proteins
5. The "mosaic" part of the fluid mosaic model refers to themembrane ____.
a) proteins
b) phospholipids
c) cholesterol
d) functions
e) layers
9. Transport of a molecule across a cell membrane by facilitateddiffusion ____.
a) does not exhibit specificity for a particular type ofmolecule
b) requires the input of energy
c) depends on a concentration gradient
d) goes against the concentration gradient
e) allows non-polar uncharged molecules to diffuse across amembrane
13. A transport system in which transport of an ion in onedirection provides the energy for active transport in the oppositedirection is known as ____.
a) primary active transport
b) active diffusion
c) secondary active transport
d) cotransport
e) osmosis
14. Cells undergo exocytosis ____.
a) to pump protons down a concentration gradient
b) when replicating
c) to secrete protein and wastes from the cell
d) to ingest nutrients
e) as a means of cellular protection
15. What is the molecular basis of familialhypercholestremia?
a) HDL enters cells using a specific receptor on the cellsurface
b) LDL enters cells using a specific receptor on the cellsurface
c) HDL exits cells using a specific receptor on the cellsurface
d) LDL exits cells using a specific receptor on the cellsurface
e) receptor-mediated exocytosis
16. Carrier molecules are utilized for ____.
a) active transport only
b) passive transport only
c) both active and passive transport
d) osmosis
e) transport of all types of molecules
17. All of the following are functions of integral membraneproteins EXCEPT ____.
a) transport of polar molecules
b) reception of chemical signals form other cells
c) cell division
d) recognition of other cells as being "like"
e) cell-cell binding
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 |
