Cell Biology: Plasma Membrane Structure

False (B)

<p>Nucleic acids (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>The plasma membrane controls the movement of substances into and out of the cell.</p> Signup and view all the answers

<p>phospholipid</p> Signup and view all the answers

<p>Phospholipids = Provide rigidity and influence fluidity Cholesterol = Major structural components of the bilayer Glycolipids = Involved in cell recognition Proteins = Structural components of the membrane, but not involved in other functions.</p> Signup and view all the answers

<p>All of the above (D)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>The glycocalyx is a carbohydrate-rich layer on the cell's surface formed by glycolipids and glycoproteins. It plays a role in cell recognition, adhesion, and protection.</p> Signup and view all the answers

<p>Cholesterol maintains membrane fluidity in varying temperatures. (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Phagocytosis, pinocytosis, receptor-mediated endocytosis</p> Signup and view all the answers

<p>gap junction</p> Signup and view all the answers

<p>Simple diffusion = Movement of small, non-polar molecules Facilitated diffusion = Transport through protein channels or carriers Osmosis = Diffusion of water Active transport = Movement against a concentration gradient using energy</p> Signup and view all the answers

<p>Tight junctions (C)</p> Signup and view all the answers

<p>To maintain the electrochemical gradient by pumping 3 Na+ ions out and 2 K+ ions into the cell.</p> Signup and view all the answers

A selectively permeable barrier surrounding cells, controlling substance movement.

Movement of lipids and proteins side-to-side within their leaflet in the membrane.

Major lipids that form the bilayer, having a hydrophilic head and hydrophobic tails.

Rare movement of lipids from one leaflet to another, requiring energy and specific enzymes.

A lipid embedded in the membrane that influences fluidity and stability.

Fatty acids with no double bonds; they pack tightly, decreasing membrane fluidity.

Lipids with carbohydrate groups, important for cell recognition.

Proteins embedded in the bilayer, functioning as channels or receptors.

Fatty acids with double bonds that create kinks, increasing membrane fluidity.

Proteins attached loosely to the membrane, involved in signaling or structure.

Movement of substances across a membrane without energy, includes diffusion types.

An active transport mechanism that pumps Na+ out and K+ into the cell using ATP.

A carbohydrate-rich area on the cell surface for recognition and protection.

Structures connecting cells for communication and integrity, including tight junctions and desmosomes.

Lipids with both hydrophilic and hydrophobic regions, forming structures in water.