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Biol 1201 Exam 2 Questions And Answers 2026 Verified.

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BIOL 1201 EXAM 2 QUESTIONS AND ANSWERS 2026 VERIFIED.

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BIOL 1201 EXAM 2 QUESTIONS AND
ANSWERS 2026 VERIFIED.

What is the hydrophilic head of a phospholipid? - ANS Polar, interacts with water

What are the hydrophobic tails of a phospholipid? - ANS Nonpolar, avoid water

What do phospholipids form in water? - ANS Bilayer with heads outward, tails inward

What do integral proteins do? - ANS Span the membrane

What are peripheral proteins? - ANS Attached to the membrane surface

What are the functions of membrane proteins? - ANS Transport, enzymatic activity, signal
transduction, cell-cell recognition, intercellular joining, attachment

What role do membrane carbohydrates play? - ANS Involved in cell-cell recognition

What is the fluid mosaic model? - ANS Membrane is flexible with proteins embedded

How do hydrophobic molecules cross the membrane? - ANS Easily

@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 12

, What do hydrophilic molecules/ions need to cross the membrane? - ANS Transport proteins

Why can't ions/polar molecules cross the membrane efficiently? - ANS Due to charge

What is the order of crossing rates for molecules? - ANS Small nonpolar > small polar > large
polar > ions

What do channel proteins provide? - ANS Hydrophilic tunnel

What do carrier proteins do? - ANS Change shape to move molecules

What is diffusion? - ANS Movement from high to low concentration

What is osmosis? - ANS Diffusion of water

What is facilitated diffusion? - ANS Passive transport using proteins

What is a concentration gradient? - ANS Difference in concentration (stores potential energy)

What happens in a hypertonic solution? - ANS Cell loses water

What happens in a hypotonic solution? - ANS Cell gains water

What is an isotonic solution? - ANS No net movement

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