BIO 251 EXAM 1 COMPREHENSIVE TEST PREP | UPDATED FOR
2025–2026
Which of the following accurately represents the levels of organization for the human body,
from least to most complex? - correct answer -Cells, tissues, organs, organ systems
Which of the following is NOT a primary tissue in the body? - correct answer -Digestive
Which of the following is incorrect? - correct answer -Lipids are synthesized in the nucleus
Actin is found in what type of cytoskeletal filament? - correct answer -Microfilament
Direct communication between cells is carried out by _________, which allow ions and small
molecules to diffuse directly from one cell to the other. - correct answer -Gap Junctions
What are the two major extracellular fluid (ECF) compartments of the body? - correct answer -
Interstitial fluid and plasma
The body fluid compartment with a high sodium (Na+) concentration is - correct answer -
Extracellular fluid (ECF)
Which of the following statements about homeostasis is FALSE? - correct answer -The primary
mechanism to maintain homeostasis is positive feedback
Which of the following components of the plasma membrane forms ion channels? - correct
answer -Integral membrane proteins
, Which of the following most accurate describes the plasma membrane? - correct answer -The
polar regions of the phospholipids are in direct contact with water in both intracellular fluid and
extracellular fluid compartments
Which of the following transport systems does NOT require energy? - correct answer -Both A
and B
A. Diffusion through ion channels
B. Facilitated diffusion
A molecule that is similar in structure to a chemical messenger and binds with that messenger's
receptor to stimulate a response from the target cell is called a(an) _____. - correct answer -
Agonist
Which of the following compartments contains most of the water found in humans? - correct
answer -Intracellular fluid (cytosol)
Which type of chemical messenger is released from one cell and communicates with nearby
neighboring cells? - correct answer -Paracrine
Communications between cells can occur through the binding of a chemical messenger released
from one cell to a specific ___________ located on the target cell. - correct answer -Receptor
Which of the following will affect the magnitude of a cell's response to a specific messenger
molecule? - correct answer -All of the above
When a molecule is referred to as polar, it means that ___________. - correct answer -Both B
and C
B. The molecule is unlikely to pass directly through the lipid bilayer of the cell membrane.
C. The molecule is likely to react with water
2025–2026
Which of the following accurately represents the levels of organization for the human body,
from least to most complex? - correct answer -Cells, tissues, organs, organ systems
Which of the following is NOT a primary tissue in the body? - correct answer -Digestive
Which of the following is incorrect? - correct answer -Lipids are synthesized in the nucleus
Actin is found in what type of cytoskeletal filament? - correct answer -Microfilament
Direct communication between cells is carried out by _________, which allow ions and small
molecules to diffuse directly from one cell to the other. - correct answer -Gap Junctions
What are the two major extracellular fluid (ECF) compartments of the body? - correct answer -
Interstitial fluid and plasma
The body fluid compartment with a high sodium (Na+) concentration is - correct answer -
Extracellular fluid (ECF)
Which of the following statements about homeostasis is FALSE? - correct answer -The primary
mechanism to maintain homeostasis is positive feedback
Which of the following components of the plasma membrane forms ion channels? - correct
answer -Integral membrane proteins
, Which of the following most accurate describes the plasma membrane? - correct answer -The
polar regions of the phospholipids are in direct contact with water in both intracellular fluid and
extracellular fluid compartments
Which of the following transport systems does NOT require energy? - correct answer -Both A
and B
A. Diffusion through ion channels
B. Facilitated diffusion
A molecule that is similar in structure to a chemical messenger and binds with that messenger's
receptor to stimulate a response from the target cell is called a(an) _____. - correct answer -
Agonist
Which of the following compartments contains most of the water found in humans? - correct
answer -Intracellular fluid (cytosol)
Which type of chemical messenger is released from one cell and communicates with nearby
neighboring cells? - correct answer -Paracrine
Communications between cells can occur through the binding of a chemical messenger released
from one cell to a specific ___________ located on the target cell. - correct answer -Receptor
Which of the following will affect the magnitude of a cell's response to a specific messenger
molecule? - correct answer -All of the above
When a molecule is referred to as polar, it means that ___________. - correct answer -Both B
and C
B. The molecule is unlikely to pass directly through the lipid bilayer of the cell membrane.
C. The molecule is likely to react with water
