Cell Membrane Structure and Function Quiz

<p>Cooler temperatures can cause the membrane to solidify. (B)</p> Signup and view all the answers

<p>They increase fluidity by preventing tight packing. (D)</p> Signup and view all the answers

<p>It decreases fluidity by restraining phospholipid movement. (B)</p> Signup and view all the answers

<p>Adaptation to different environmental conditions. (C)</p> Signup and view all the answers

<p>To facilitate movement of substances across the membrane. (D)</p> Signup and view all the answers

<p>To pump out excess water. (A)</p> Signup and view all the answers

<p>The cell loses water and may shrink. (C)</p> Signup and view all the answers

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

<p>Channel proteins, specifically aquaporins (D)</p> Signup and view all the answers

<p>It can move substances against their concentration gradient. (A)</p> Signup and view all the answers

<p>There is no net movement of water. (C)</p> Signup and view all the answers

<p>Channel proteins provide a corridor for movement, while carrier proteins bind to the solute and change shape. (B)</p> Signup and view all the answers

<p>It requires additional energy. (B)</p> Signup and view all the answers

<p>To penetrate the hydrophobic core of the membrane and carry out specific functions. (C)</p> Signup and view all the answers

<p>By binding to CD4 and the CCR5 co-receptor on the cell surface. (C)</p> Signup and view all the answers

<p>Hydrophobic (nonpolar) molecules. (D)</p> Signup and view all the answers

<p>Lipids and proteins. (C)</p> Signup and view all the answers

<p>When the number of molecules crossing the membrane in one direction is equal to the number crossing in the opposite direction. (C)</p> Signup and view all the answers

<p>The hydrophobic core of the lipid bilayer blocks polar molecules but allows hydrophobic molecules to pass. (D)</p> Signup and view all the answers

<p>They play a role in determining the asymmetrical distribution of plasma membrane components as the membrane is being built. (B)</p> Signup and view all the answers

<p>The diffusion of water across a selectively permeable membrane. (A)</p> Signup and view all the answers

<p>To generate a voltage difference across a membrane. (D)</p> Signup and view all the answers

<p>The use of an existing ion gradient to transport another solute. (A)</p> Signup and view all the answers

<p>Active transport requires energy input, while facilitated diffusion doesn't. (D)</p> Signup and view all the answers

<p>It involves the movement of large molecules via vesicles. (C)</p> Signup and view all the answers

<p>It is a type of active transport. (C)</p> Signup and view all the answers

<p>Phagocytosis (A)</p> Signup and view all the answers

<p>The cell releases substances to the outside by vesicles fusing with the plasma membrane. (A)</p> Signup and view all the answers

<p>It creates a voltage that affects the movement of charged ions. (B)</p> Signup and view all the answers

The plasma membrane is a barrier that separates the inside of a cell from its environment.

The most abundant type of lipid in the cell membrane. They have a hydrophilic head and hydrophobic tails.

A model describing the structure of the cell membrane. It emphasizes that the membrane is fluid and contains a variety of proteins.

A type of transport that moves substances across the membrane without requiring energy. It follows the concentration gradient.

A type of transport that moves substances across the membrane against their concentration gradient. It requires energy.

A process where the cell expels substances out of the cell.

A process where the cell takes in substances from outside the cell.

Proteins that are embedded in the plasma membrane.

Proteins found on the surface of the cell membrane, loosely attached.

Proteins that span the entire cell membrane, with parts exposed on both sides.

A membrane's ability to allow some substances to pass through more easily than others.

The movement of molecules from an area of high concentration to an area of low concentration.

The diffusion of water across a selectively permeable membrane.

Specialized proteins that help move molecules across the cell membrane.

Proteins that form channels through the cell membrane, allowing specific molecules to pass.

The ability of a surrounding solution to cause cells to gain or lose water.

The solute concentration is the same as that inside the cell; no net water movement across the plasma membrane.

The solute concentration is greater than that inside the cell; cell loses water.

The solute concentration is less than that inside the cell; cell gains water.

The control of solute concentrations and water balance in organisms.

Transport proteins that allow hydrophilic substances to pass across the membrane, aiding the passive movement of molecules.

A type of active transport that generates voltage across a membrane. It uses energy to pump ions, creating an electrical potential difference.

A type of cotransport where the active transport of one solute indirectly drives the transport of another solute.

A type of cotransport where the movement of one solute down its concentration gradient provides energy for the movement of another solute against its concentration gradient.

A type of cotransport where the movement of one solute down its concentration gradient provides energy for the movement of another solute in the opposite direction.

A type of bulk transport where cells engulf large particles, forming vacuoles that fuse with lysosomes for digestion. Think of 'eating' large food particles!

A type of bulk transport where cells take in extracellular fluid in tiny vesicles, 'gulping' small amounts of fluid.