RIO BIO 156 EXAMS SCRIPT 2025/2026 QUESTIONS AND
ANSWERS GRADED A+
✔✔Diffusion does not require the cell to expend ATP. Therefore, diffusion is considered
a type of - ✔✔passive transport.
✔✔Contractile vacuoles - ✔✔prevent cells from bursting as a result of the influx of
excess water.
✔✔The act of a white blood cell engulfing a bacterium is - ✔✔phagocytosis.
✔✔Cells that lack a membrane-bound nucleus are __________ cells. - ✔✔prokaryotic
✔✔Which of the following statements is consistent with the Cell Theory? - ✔✔The cell is
the basic structural and functional unity of life.
✔✔Which of the following cell structures is not associated with the breakdown of
harmful substances or substances that are no longer needed by the cell? -
✔✔mitochondria
✔✔A cell that has neither a net gain nor a net lose of water when it is immersed in a
solution is - ✔✔isotonic to its environment.
✔✔The Golgi apparatus - ✔✔stores, modifies, and packages proteins.
✔✔Which one of the following is not a function of membrane proteins? Membrane
proteins - ✔✔All of the choices are membrane protein functions.
✔✔Active transport - ✔✔All of the choices are correct.
✔✔Small, nonpolar, hydrophobic molecules such as fatty acids - ✔✔easily pass through
a membrane's lipid bilayer.
✔✔If a biologist said that eukaryotic cells get their power from bacteria, they would be
referring to - ✔✔the mitochondria in our cells that may have originated as
endosymbiotic bacteria.
✔✔Long fibers of DNA and protein are called a - ✔✔chromatin.
✔✔Membrane phospholipids - ✔✔None of the choices are correct.
✔✔Osmosis can be defined as - ✔✔the diffusion of water across a membrane.
, ✔✔As cell size increases, the - ✔✔volume increases faster than the surface area.
✔✔Smooth endoplasmic reticulum - ✔✔stores calcium ions in muscle cells.
✔✔Cilia differ from flagella in that - ✔✔cilia are typically more numerous and shorter
than flagella.
✔✔ATP is considered a high-energy compound because under cellular conditions, 7.3
kcal per mole of energy is released when a bond is broken between ______. - ✔✔the
adenosine diphosphate and the third phosphate.
✔✔An enzyme is generally named by adding ______ to the end of the name of the
______. - ✔✔"-ase," substrate
✔✔When an enzyme catalyzes a reaction, - ✔✔it lowers the activation energy of the
reaction.
✔✔Which of the following is consistent with the laws of physics governing energy? -
✔✔Eventually sunlight that is absorbed on the earth returns to space as dispersed heat.
✔✔Which of the following organelles produces ATP? - ✔✔B. Mitochondria
✔✔Bacterial production of the enzymes needed for the synthesis of the amino acid
tryptophan declines with increasing levels of tryptophan and increases as tryptophan
levels decline. This is an example of - ✔✔feedback inhibition.
✔✔Which statement describes the currently accepted theory of how an enzyme and its
substrate fit together? - ✔✔As the substrate binds to the enzyme, the shape of the
active site changes to accommodate the reaction.
✔✔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
✔✔Life's primary source of energy is ____. - ✔✔ATP
✔✔Which one of the following is false? - ✔✔Enzymes are used up in chemical
reactions.
✔✔According to __________, energy cannot be created or destroyed. - ✔✔the first law
of thermodynamics
ANSWERS GRADED A+
✔✔Diffusion does not require the cell to expend ATP. Therefore, diffusion is considered
a type of - ✔✔passive transport.
✔✔Contractile vacuoles - ✔✔prevent cells from bursting as a result of the influx of
excess water.
✔✔The act of a white blood cell engulfing a bacterium is - ✔✔phagocytosis.
✔✔Cells that lack a membrane-bound nucleus are __________ cells. - ✔✔prokaryotic
✔✔Which of the following statements is consistent with the Cell Theory? - ✔✔The cell is
the basic structural and functional unity of life.
✔✔Which of the following cell structures is not associated with the breakdown of
harmful substances or substances that are no longer needed by the cell? -
✔✔mitochondria
✔✔A cell that has neither a net gain nor a net lose of water when it is immersed in a
solution is - ✔✔isotonic to its environment.
✔✔The Golgi apparatus - ✔✔stores, modifies, and packages proteins.
✔✔Which one of the following is not a function of membrane proteins? Membrane
proteins - ✔✔All of the choices are membrane protein functions.
✔✔Active transport - ✔✔All of the choices are correct.
✔✔Small, nonpolar, hydrophobic molecules such as fatty acids - ✔✔easily pass through
a membrane's lipid bilayer.
✔✔If a biologist said that eukaryotic cells get their power from bacteria, they would be
referring to - ✔✔the mitochondria in our cells that may have originated as
endosymbiotic bacteria.
✔✔Long fibers of DNA and protein are called a - ✔✔chromatin.
✔✔Membrane phospholipids - ✔✔None of the choices are correct.
✔✔Osmosis can be defined as - ✔✔the diffusion of water across a membrane.
, ✔✔As cell size increases, the - ✔✔volume increases faster than the surface area.
✔✔Smooth endoplasmic reticulum - ✔✔stores calcium ions in muscle cells.
✔✔Cilia differ from flagella in that - ✔✔cilia are typically more numerous and shorter
than flagella.
✔✔ATP is considered a high-energy compound because under cellular conditions, 7.3
kcal per mole of energy is released when a bond is broken between ______. - ✔✔the
adenosine diphosphate and the third phosphate.
✔✔An enzyme is generally named by adding ______ to the end of the name of the
______. - ✔✔"-ase," substrate
✔✔When an enzyme catalyzes a reaction, - ✔✔it lowers the activation energy of the
reaction.
✔✔Which of the following is consistent with the laws of physics governing energy? -
✔✔Eventually sunlight that is absorbed on the earth returns to space as dispersed heat.
✔✔Which of the following organelles produces ATP? - ✔✔B. Mitochondria
✔✔Bacterial production of the enzymes needed for the synthesis of the amino acid
tryptophan declines with increasing levels of tryptophan and increases as tryptophan
levels decline. This is an example of - ✔✔feedback inhibition.
✔✔Which statement describes the currently accepted theory of how an enzyme and its
substrate fit together? - ✔✔As the substrate binds to the enzyme, the shape of the
active site changes to accommodate the reaction.
✔✔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
✔✔Life's primary source of energy is ____. - ✔✔ATP
✔✔Which one of the following is false? - ✔✔Enzymes are used up in chemical
reactions.
✔✔According to __________, energy cannot be created or destroyed. - ✔✔the first law
of thermodynamics
