term 2- lec 2

Are the building blocks of the nuclear lamina

. They are mutated the premature aging disease Hutchinson-Gilford progeria syndrome

Localise exclusively in the nucleus

Regulate the electrical potential across the membrane (correct)

Hold transmembrane adhesion proteins that anchor the cell to the extracellular matrix

Membranes are the compartmentalization unit for cells and organelles.

. Undergo steps of exocytosis and endocytosis and different fusion events around the cell and are involved in cell-cell fusion and viral entry

They have receptors on other cells, they transmit forces to the cytoskeleton and holds Adenosine triphosphate (ATP)-driven enzymes or all of the above (correct)

Can form the plasma membrane but only in eukaryotes.

It is behind the plasma membrane and it is amphipathic

Is the main constituent of the plasma membrane with a key characteristic of being amphiphilic. (correct)

It is hydrophobic unless an electron gradient provides energy

<p>Have hydrophobic transmembrane domains</p> Signup and view all the answers

<p>Pumps are enzymes that use energy from adenosine triphosphate (ATP), light, or (rarely) other sources to move ions (generally, cations) and other solutes across membranes at relatively modest rates</p> Signup and view all the answers

<p>Carriers are ion-specific pores that typically open and close transiently in a regulated manner. b. Translocation of an ion down its concentration gradient can drive another ion or solute up a concentration gradient c. Carriers are also called secondary transporters d. An example of a carrier is the glucose transporter</p> Signup and view all the answers