Test Bank Biology Concepts and Applications 10th Edition Cecie Starr Christine
Evers Lisa Starr Updated 2025/2026 with Solution questions and answers 60 +
A researcher is studying membrane transport in red blood cells. When the cells
are placed in a solution with a higher solute concentration than the cytoplasm,
the cells begin to lose water and shrink. Which process best explains this
observation, and why does it occur?
A. Diffusion, because solutes move out of the cell
B. Osmosis, because water moves from low to high solute concentration
C. Active transport, because ATP is required
D. Endocytosis, because the membrane engulfs fluid
Answer: B
Rationale: Osmosis is the movement of water across a semipermeable membrane
from an area of lower solute concentration to higher solute concentration,
causing the cells to shrink in a hypertonic solution.
A mutation in a regulatory gene causes continuous production of an enzyme even
when its substrate is absent. What is the most likely effect on the cell?
A. Increased efficiency
1
,B. Waste of cellular energy and resources
C. Improved adaptation
D. Reduced transcription
Answer: B
Rationale: Producing unnecessary proteins consumes ATP and amino acids,
reducing cellular efficiency.
A scientist observes that a plant grown under red light grows taller than one
grown under blue light. Which biological explanation best accounts for this
observation?
A. Red light increases chlorophyll production only
B. Blue light inhibits photosynthesis
C. Light wavelength influences plant hormone activity
D. Red light prevents respiration
Answer: C
Rationale: Different wavelengths affect photoreceptors and hormones like auxins,
influencing plant growth patterns.
2
,A population of insects develops resistance to a pesticide over several
generations. Which statement best explains this process?
A. Individual insects adapt during their lifetime
B. Resistant insects survive and reproduce more
C. Pesticides cause all insects to mutate
D. Resistance occurs randomly without selection
Answer: B
Rationale: Natural selection favors individuals with resistance traits, increasing
their frequency over time.
A researcher disables ribosomes in a cell. Which immediate effect would be
observed?
A. DNA replication stops
B. Protein synthesis ceases
C. Lipid production increases
D. ATP production increases
3
, Answer: B
Rationale: Ribosomes are essential for translating mRNA into proteins.
A plant cell is placed in distilled water and begins to swell but does not burst.
Why?
A. The membrane is impermeable
B. The cell wall provides structural support
C. Water cannot enter the cell
D. Active transport removes water
Answer: B
Rationale: The rigid cell wall prevents excessive expansion and bursting.
A mutation causes a change in a single amino acid in a protein, altering its
function. What type of mutation is this?
A. Silent mutation
B. Missense mutation
4
Evers Lisa Starr Updated 2025/2026 with Solution questions and answers 60 +
A researcher is studying membrane transport in red blood cells. When the cells
are placed in a solution with a higher solute concentration than the cytoplasm,
the cells begin to lose water and shrink. Which process best explains this
observation, and why does it occur?
A. Diffusion, because solutes move out of the cell
B. Osmosis, because water moves from low to high solute concentration
C. Active transport, because ATP is required
D. Endocytosis, because the membrane engulfs fluid
Answer: B
Rationale: Osmosis is the movement of water across a semipermeable membrane
from an area of lower solute concentration to higher solute concentration,
causing the cells to shrink in a hypertonic solution.
A mutation in a regulatory gene causes continuous production of an enzyme even
when its substrate is absent. What is the most likely effect on the cell?
A. Increased efficiency
1
,B. Waste of cellular energy and resources
C. Improved adaptation
D. Reduced transcription
Answer: B
Rationale: Producing unnecessary proteins consumes ATP and amino acids,
reducing cellular efficiency.
A scientist observes that a plant grown under red light grows taller than one
grown under blue light. Which biological explanation best accounts for this
observation?
A. Red light increases chlorophyll production only
B. Blue light inhibits photosynthesis
C. Light wavelength influences plant hormone activity
D. Red light prevents respiration
Answer: C
Rationale: Different wavelengths affect photoreceptors and hormones like auxins,
influencing plant growth patterns.
2
,A population of insects develops resistance to a pesticide over several
generations. Which statement best explains this process?
A. Individual insects adapt during their lifetime
B. Resistant insects survive and reproduce more
C. Pesticides cause all insects to mutate
D. Resistance occurs randomly without selection
Answer: B
Rationale: Natural selection favors individuals with resistance traits, increasing
their frequency over time.
A researcher disables ribosomes in a cell. Which immediate effect would be
observed?
A. DNA replication stops
B. Protein synthesis ceases
C. Lipid production increases
D. ATP production increases
3
, Answer: B
Rationale: Ribosomes are essential for translating mRNA into proteins.
A plant cell is placed in distilled water and begins to swell but does not burst.
Why?
A. The membrane is impermeable
B. The cell wall provides structural support
C. Water cannot enter the cell
D. Active transport removes water
Answer: B
Rationale: The rigid cell wall prevents excessive expansion and bursting.
A mutation causes a change in a single amino acid in a protein, altering its
function. What type of mutation is this?
A. Silent mutation
B. Missense mutation
4
