RIO BIO 156 EXAM 1 || MOST RECENT EXAM 2026-
2027 ACTUAL COMPLETE REAL EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+ | GUARANTEED SUCCESS!!
NEWEST EXAM | JUST RELEASED!!
List several surface structures of cells and explain how they
help cells survive. -
ANSWER-Cell Wall: Protects, structurally
supports cell
Plasma membrane: selectively permeable and controls
exchanges between the
cell and its
environment.
Describe the major kinds of microscopes and explain
their main use. -
ANSWER-Light microscope uses light to pass through
the image onto
magnifying
lenses.
Scanning electron microscope scans the outside of
cell surfaces.
Transmission electron microscope can magnify the internal
cellular structures.
,Describe how the relationship between the surface area of a cell
and its volume
changes as the cell increases in size. - ANSWER-A cell's
surface area
increases with the square of its diameter, while its volume
increases with the
cube. This surface- to-volume ratio limits cell size and
influences cell shape.
Explain two reasons why smaller cells are biologically more
efficient than larger cells. - ANSWER-The rate of exchange
across a plasma membrane depends on its surface area: The
bigger it is, the more substances can cross it during a given
interval.
Describe the eukaryotic nucleus - ANSWER-Keeps DNA
separated from
cytoplasm; makes ribosome subunits; controls
access to DNA
Describe the structure and function of cell walls. -
ANSWER-Protects,
structurally
supports cell
Describe the structure and function of cell junctions. -
ANSWER-structures that
, connect a cell directly to other cells or to its environment.
Cells send and
receive substances and signals through
some junctions.
Describe the essential structure and function of the cell
membrane. – ANSWER-All cell membranes, including the
plasma membrane and organelle membranes, consist mainly of
phospholipids organized as a lipid bilayer. organized as a lipid
bilayer with many proteins embedded in it and attached to its
surfaces.
Describe the function of the cell membrane. - ANSWER-
proteins embedded in
or attached to a lipid bilayer add specific functions to each
cell membrane.
Define the term diffusion. Explain what causes diffusion and
why it is a spontaneous event. - ANSWER-Diffusion is the
spontaneous spreading of molecules or ions, and it is an
essential way in which substances move into, through, and out
of cells.
Distinguish between passive transport and active transport. -
ANSWER-passive transport: Membrane-crossing mechanism
that requires no energy input. active transport: Energy-
requiring mechanism in which a transport protein pumps a
solute across a cell membrane against the solute's
concentration gradient.
2027 ACTUAL COMPLETE REAL EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+ | GUARANTEED SUCCESS!!
NEWEST EXAM | JUST RELEASED!!
List several surface structures of cells and explain how they
help cells survive. -
ANSWER-Cell Wall: Protects, structurally
supports cell
Plasma membrane: selectively permeable and controls
exchanges between the
cell and its
environment.
Describe the major kinds of microscopes and explain
their main use. -
ANSWER-Light microscope uses light to pass through
the image onto
magnifying
lenses.
Scanning electron microscope scans the outside of
cell surfaces.
Transmission electron microscope can magnify the internal
cellular structures.
,Describe how the relationship between the surface area of a cell
and its volume
changes as the cell increases in size. - ANSWER-A cell's
surface area
increases with the square of its diameter, while its volume
increases with the
cube. This surface- to-volume ratio limits cell size and
influences cell shape.
Explain two reasons why smaller cells are biologically more
efficient than larger cells. - ANSWER-The rate of exchange
across a plasma membrane depends on its surface area: The
bigger it is, the more substances can cross it during a given
interval.
Describe the eukaryotic nucleus - ANSWER-Keeps DNA
separated from
cytoplasm; makes ribosome subunits; controls
access to DNA
Describe the structure and function of cell walls. -
ANSWER-Protects,
structurally
supports cell
Describe the structure and function of cell junctions. -
ANSWER-structures that
, connect a cell directly to other cells or to its environment.
Cells send and
receive substances and signals through
some junctions.
Describe the essential structure and function of the cell
membrane. – ANSWER-All cell membranes, including the
plasma membrane and organelle membranes, consist mainly of
phospholipids organized as a lipid bilayer. organized as a lipid
bilayer with many proteins embedded in it and attached to its
surfaces.
Describe the function of the cell membrane. - ANSWER-
proteins embedded in
or attached to a lipid bilayer add specific functions to each
cell membrane.
Define the term diffusion. Explain what causes diffusion and
why it is a spontaneous event. - ANSWER-Diffusion is the
spontaneous spreading of molecules or ions, and it is an
essential way in which substances move into, through, and out
of cells.
Distinguish between passive transport and active transport. -
ANSWER-passive transport: Membrane-crossing mechanism
that requires no energy input. active transport: Energy-
requiring mechanism in which a transport protein pumps a
solute across a cell membrane against the solute's
concentration gradient.
