3. In an aqueous environment, the phospholipids of a membrane ____. a) are arran

ID: 56619 • Letter: 3

Question

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 layer located at the surface

c) are arranged in a bilayer with the fatty acid tails located at the surface

d) are arranged in a bilayer but the phospholipids have no specific orientation

e) dissolve

4. which of the following molecules demonstrate dual solubility characteristics

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 the membrane ____.

a) proteins

b) phospholipids

c) cholesterol

d) functions

e) layers

9. Transport of a molecule across a cell membrane by facilitated diffusion ____.

a) does not exhibit specificity for a particular type of molecule

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 a membrane

13. A transport system in which transport of an ion in one direction provides the energy for active transport in the opposite direction 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 familial hypercholestremia?

a) HDL enters cells using a specific receptor on the cell surface

b) LDL enters cells using a specific receptor on the cell surface

c) HDL exits cells using a specific receptor on the cell surface

d) LDL exits cells using a specific receptor on the cell surface

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 membrane proteins 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

Explanation / Answer