Cell membrane and Transport Practice quiz
The diagram shows the movement of ions against a concentration gradient to an area of higher concentration. Which molecule provides the energy needed for this movement to occur in a cell?
ATP
A protein moves molecules across the membrane from an area of low concentration to an area of high concentration
Active Transport
Which means of particle transport requires the input of energy from the cell?
Active transport
Which statement best describes how channel and carrier proteins in the plasma membrane are similar?
Both allow for the flow of molecules into and out of a cell.
A protein facilitates molecules moving across the membrane from an area of high concentration to an area of low concentration
Facilitated Diffusion
Animal cells prefer to be in solutions of which tonicity?
Isotonic
A researcher noticed that a similar CH2 molecular structure was also located in the plasma membrane of an animal cell. This CH2 molecular structure contained a negatively charged phosphate group. Which statement best describes the primary function of the CH2 and phosphate molecular structure located in the plasma membrane?
It allows a cell to regulate the movement of materials into and out of a cell.
The indicated protein is part of a cell membrane. What is the most likely purpose of this protein?
It allows passage of particles into and out of the cell.
When the concentration of molecules on both sides of a membrane is the same, the molecules will ______.
Move across the membrane in both directions
how active transport differs from passive transport?
Only active transport requires ATP.
Whats another name for Water movement and the cell membrane?
Osmosis Across the membrane
Whats is a function of the cell membrane?
Regulates which materials enter and leave the cell
An animal cell that is surrounded by fresh water will burst because the osmotic pressure causes ______.
Water to move into the cell
The cell membrane is sometimes referred to as the phospholipid ____ because it is composed of two layers of phospholipids
bilayer
Small molecules moving across the membrane from an area of high concentration to an area of low concentration
diffusion
Which transport mechanisms require the formation of a vesicle to transport material into or out of a cell?
exocytosis and endocytosis
Phospholipids are composed of ___ heads that attract water and ____ tails that repel water.
hydrophollic hydrophobic
Which component of this membrane contains a hydrophobic region and acts as the primary barrier to most foreign substances?
phospholipid bilayer
Which of the following is most involved in providing structure for a plasma membrane?
the arrangement of the hydrophobic and hydrophilic ends of the phospholipids
