bio plasma membrane
Which of the following statements regarding thermodynamics is false?
An automobile engine is a closed system because it does not exchange energy and matter with its surroundings.
Which of the following statements regarding membrane protein function is false?
Membrane proteins transfer genetic information to the cytoplasm.
The eukaryotic cell has multiple membrane-enclosed compartments. This evolutionary innovation provides what advantage to the cell?
The different membrane-enclosed spaces allow different parts of the cell to perform specific functions.
The lipids in a cell membrane are arranged _____.
The lipids in a cell membrane are arranged _____.
Which of the following statements regarding membrane function is false?
The plasma membrane is the control center of the cell
Relaying a message from a membrane receptor to a molecule that performs a specific function within a cell occurs when
a signaling molecule binds to a protein that extends to the outside of the cell.
Membrane phospholipids
are able to drift about in the plasma membrane.
Glucose molecules provide energy to power the swimming motion of sperm. In this example, the sperm are changing
chemical energy into kinetic energy.
Fluidity of an animal cell plasma membrane is enhanced by __________.
cholesterol molecules
Living systems
decrease their entropy while increasing the entropy of the universe.
The fluid mosaic model describes the plasma membrane as consisting of
diverse proteins embedded in a phospholipid bilayer.
When considering the formation of membranes, they __________.
form spontaneously in aqueous environments
Which of the following direct energy transfers is impossible in living systems?
heat to light energy
The cholesterol associated with animal cell membranes
helps to keep phospholipids from being too close to one another.
Kinetic energy differs from chemical energy in that
kinetic energy is the energy of a moving object, whereas chemical energy is the potential energy of molecules.
The plasma membrane is selectively permeable. Which of the following can pass freely through the membrane with no assistance?
oxygen and carbon dioxide
Most of the functions of a cell membrane, including transport and enzymatic function, are performed by
proteins
Overall, membranes seem to have a great deal in common, but on closer inspection it is revealed that membranes of different cells have unique properties. What is the primary component of membranes that gives membranes cell-specific properties?
proteins
Which characteristic promoted the utilization of lipids as the first cell membrane?
self-assembly into a simple membrane
All cells are enclosed by a plasma membrane that is similar in ________ and ________.
structure; function
Plasma membranes are selectively permeable. This means that
the plasma membrane allows some substances to enter or leave a cell more easily than others.
In the reaction A → B + C + heat,
the potential energy of the products is less than that of the reactant.
A steer must eat at least 100 pounds of grain to gain less than 10 pounds of muscle tissue. This illustrates
the second law of thermodynamics.
In the figure below, working from the inside out, what would be the order of components observed?
water, hydrophilic head, hydrophobic tail, hydrophobic tail, hydrophilic head, water
Frequently, transplanted organs are rejected by the recipient's body. How is this reaction related to plasma membranes?
Each person has a unique set of carbohydrate chains attached to his or her plasma membranes.
According to ________, energy cannot be created or destroyed.
the first law of thermodynamics
In an oil-based, nonpolar environment, phospholipids would arrange themselves so that they __________.
would stay together but in a reverse orientation, with their tails projecting outward