Cell Biology Questions
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Which plant(s) are adapted to hot, dry desert environments?
A car uses the energy stored in the organic molecules of gasoline to propel the vehicle forward. However, not all the energy contained in the fuel molecules is used for propulsion; instead, some is lost as heat. In this scenario, entropy is ____, illustrating the ____ law of thermodynamics.
When ATP loses a phosphate group and releases that energy, ____ is formed.
Glucose enters a cell via a glucose transporter. What prevents glucose molecules from moving back through the transporter and leaving the cell?
Which condition(s) increase the rate of diffusion through a semipermeable membrane?I.steep concentration gradientsII.high temperaturesIII.large molecules
What is occurring when a transport protein uses energy to pump a solute across a cell membrane against its concentration gradient?
The accompanying figure illustrates the ____ biological systems.
Enzymes increase the rate of a given reaction by lowering ____ energy.
The process by which an enzyme allows a reaction to run much faster than it would on its own is known as ____.
A car uses the energy stored in the organic molecules of gasoline to propel the vehicle forward. In this scenario, the ____ energy in the gasoline is converted to ____ energy of motion.
The red blood cells shown in the top micrograph of the accompanying figure are immersed in a(n) ____ solution.
Some enzymes require inorganic or organic molecules for proper function. These molecules are known as ____.
A single-celled freshwater organism, such as a protistan, is transferred to salt water. What is likely to happen?
Which biological molecule(s) may show enzymatic activity?
During endergonic reactions, reactants with ____ free energy are converted to molecules with ____ free energy; therefore, they require a net input of energy in order to proceed.
The red blood cells shown in the middle micrograph of the accompanying figure are immersed in a(n) ____ solution.
Methane (CH4) is a natural gas that is often used as a fuel. When it burns in the presence of oxygen, carbon dioxide and water are produced. Replace the "X" in the following reaction of methane combustion to balance the equation. CH4 + 2O2 → CO2 + XH2O
During enzyme-catalyzed reactions, the substrate is also known as the ____.
A glucose transporter changes shape when it binds to a molecule of glucose. The shape change moves glucose down its concentration gradient to the opposite side of the membrane, where it detaches from the transport protein. What does this illustrate?
Movement of a molecule against its concentration gradient always requires ____.