BIOL 2457 EXAM: 1 (CH-3) QUESTIONS WITH
CORRECT ANSWERS 2025/2026
3 Major Parts of a cell CORRECT ANSWER
-1. plasma membrane
2. cytoplasm
3. nucleus
largest organelle CORRECT ANSWER nucleus
body fluids CORRECT ANSWER Interstitial fluid, blood plasma, CSF. Act as an transport and
dissolving media
cell secretion CORRECT ANSWER gastric juices, saliva, mucus, etc. Aid in lubrication and
digestion.
fluid mosaic model CORRECT ANSWER phospholipid bilayer with embedded proteins
Phospholipids CORRECT ANSWER polar phosphate head, non-polar fatty acid tails (75%)
Cholesterol CORRECT ANSWER Stabilizes the membrane, phospholipid mobility, and
membrane fluidity. (20%)
Glycolipids CORRECT ANSWER -Polar sugar groups, non-polar fatty acids
-outer membrane only (5%).
, integral membrane proteins CORRECT ANSWER firmly embedded in the transmembrane
protein.
Peripheral Proteins CORRECT ANSWER -Loosely attached to integral proteins
-Include cytoskeleton and extracellular matrix proteins, and motor proteins.
Glycoproteins CORRECT ANSWER -abundant proteins w/ sugar groups.
-cell-cell interactions and recognition.
-part of glycocalyx
3 factors that bind cells together CORRECT ANSWER 1. Glycocalyx
2. wavy shape of cell membranes
3. cell junctions
tight junctions CORRECT ANSWER -Impermeable
-prevent leakage of extracellular fluid across a layer of epithelial cells.
-occludins in membranes of adjacent cells
Desmosomes CORRECT ANSWER -Anchoring junctions that prevent cells from being pulled
apart
- intermediate (Keratin Filaments), Linker (Cadherin) proteins.
gap junctions CORRECT ANSWER (communicating junctions) provide cytoplasmic channels
between adjacent cells by connexons.
plasma membrane CORRECT ANSWER A selectively-permeable phospholipid bilayer
forming the boundary of the cells.
CORRECT ANSWERS 2025/2026
3 Major Parts of a cell CORRECT ANSWER
-1. plasma membrane
2. cytoplasm
3. nucleus
largest organelle CORRECT ANSWER nucleus
body fluids CORRECT ANSWER Interstitial fluid, blood plasma, CSF. Act as an transport and
dissolving media
cell secretion CORRECT ANSWER gastric juices, saliva, mucus, etc. Aid in lubrication and
digestion.
fluid mosaic model CORRECT ANSWER phospholipid bilayer with embedded proteins
Phospholipids CORRECT ANSWER polar phosphate head, non-polar fatty acid tails (75%)
Cholesterol CORRECT ANSWER Stabilizes the membrane, phospholipid mobility, and
membrane fluidity. (20%)
Glycolipids CORRECT ANSWER -Polar sugar groups, non-polar fatty acids
-outer membrane only (5%).
, integral membrane proteins CORRECT ANSWER firmly embedded in the transmembrane
protein.
Peripheral Proteins CORRECT ANSWER -Loosely attached to integral proteins
-Include cytoskeleton and extracellular matrix proteins, and motor proteins.
Glycoproteins CORRECT ANSWER -abundant proteins w/ sugar groups.
-cell-cell interactions and recognition.
-part of glycocalyx
3 factors that bind cells together CORRECT ANSWER 1. Glycocalyx
2. wavy shape of cell membranes
3. cell junctions
tight junctions CORRECT ANSWER -Impermeable
-prevent leakage of extracellular fluid across a layer of epithelial cells.
-occludins in membranes of adjacent cells
Desmosomes CORRECT ANSWER -Anchoring junctions that prevent cells from being pulled
apart
- intermediate (Keratin Filaments), Linker (Cadherin) proteins.
gap junctions CORRECT ANSWER (communicating junctions) provide cytoplasmic channels
between adjacent cells by connexons.
plasma membrane CORRECT ANSWER A selectively-permeable phospholipid bilayer
forming the boundary of the cells.
