Biology 1406- Exam 2 questions and
answers rated A+
What is the fluid mosaic model? - correct answer ✔✔ Membrane proteins consist of protein
molecules embedded in a fluid bilayer of phospholipids.
What are the 6 membrane proteins? List them and describe their function - correct answer ✔✔
1-transport: transport molecules across a membrane, can be selective (ex: aquaporins transport
water)
2-Enzymatic activity: Helps to carry out metabolic pathways throughout the body
3-Signal transduction: Protein receptors; signaling molecules; can cause protein to change
shape; helps relay messages through the cell
4-Cell to cell recognition: Allows cells to recognize each other through identification tags (ex-
glycoproteins)
5-Intercellular joining- allows cells to hook together through various junctions (tight, and gap)
6-Attachment to cytoskeleton: helps maintain cell shape
Lysed - correct answer ✔✔ term for animal cell that has burst. (hypotonic solution)
Turgid - correct answer ✔✔ term for plant cell suggesting healthiness and firmness (hypotonic
solution)
Flaccid - correct answer ✔✔ term for plant cell being isotonic
Plasmolysis - correct answer ✔✔ water direction is exiting the plant cell (hypertonic solution)
Shriveled - correct answer ✔✔ water direction is exiting animal cell (hypertonic solution)
, Osmoregulation - correct answer ✔✔ the regulation of osmotic pressure in an organism. This is
maintained by keeping water and salt concentrations in check.
Isotonic - correct answer ✔✔ Solute concentration is the same as inside the cell; no net water
movement across the plasma membrane
Hypertonic - correct answer ✔✔ Solute concentration is greater than that inside the cell; cell
loses water
Hypotonic - correct answer ✔✔ Solute concentration is less than that inside the cell; cell gains
water
Passive transport - correct answer ✔✔ movement of molecules across the plasma membrane
without using energy
Active transport - correct answer ✔✔ energy (ATP) is required to move particles
Aquaporin - correct answer ✔✔ channel proteins for water
Simple diffusion - correct answer ✔✔ passive movement of particles down its concentration
gradient without any membrane transport proteins
Facilitated diffusion - correct answer ✔✔ passive transport using transport proteins
Exocytosis - correct answer ✔✔ transport vesicles migrate to the membrane, fuse with it, and
release their contents
answers rated A+
What is the fluid mosaic model? - correct answer ✔✔ Membrane proteins consist of protein
molecules embedded in a fluid bilayer of phospholipids.
What are the 6 membrane proteins? List them and describe their function - correct answer ✔✔
1-transport: transport molecules across a membrane, can be selective (ex: aquaporins transport
water)
2-Enzymatic activity: Helps to carry out metabolic pathways throughout the body
3-Signal transduction: Protein receptors; signaling molecules; can cause protein to change
shape; helps relay messages through the cell
4-Cell to cell recognition: Allows cells to recognize each other through identification tags (ex-
glycoproteins)
5-Intercellular joining- allows cells to hook together through various junctions (tight, and gap)
6-Attachment to cytoskeleton: helps maintain cell shape
Lysed - correct answer ✔✔ term for animal cell that has burst. (hypotonic solution)
Turgid - correct answer ✔✔ term for plant cell suggesting healthiness and firmness (hypotonic
solution)
Flaccid - correct answer ✔✔ term for plant cell being isotonic
Plasmolysis - correct answer ✔✔ water direction is exiting the plant cell (hypertonic solution)
Shriveled - correct answer ✔✔ water direction is exiting animal cell (hypertonic solution)
, Osmoregulation - correct answer ✔✔ the regulation of osmotic pressure in an organism. This is
maintained by keeping water and salt concentrations in check.
Isotonic - correct answer ✔✔ Solute concentration is the same as inside the cell; no net water
movement across the plasma membrane
Hypertonic - correct answer ✔✔ Solute concentration is greater than that inside the cell; cell
loses water
Hypotonic - correct answer ✔✔ Solute concentration is less than that inside the cell; cell gains
water
Passive transport - correct answer ✔✔ movement of molecules across the plasma membrane
without using energy
Active transport - correct answer ✔✔ energy (ATP) is required to move particles
Aquaporin - correct answer ✔✔ channel proteins for water
Simple diffusion - correct answer ✔✔ passive movement of particles down its concentration
gradient without any membrane transport proteins
Facilitated diffusion - correct answer ✔✔ passive transport using transport proteins
Exocytosis - correct answer ✔✔ transport vesicles migrate to the membrane, fuse with it, and
release their contents
