L6 Cell Anatomy: Membrane bound organelles

Mer Scott
Quiz by Mer Scott, updated more than 1 year ago
Mer Scott
Created by Mer Scott almost 4 years ago
12
3

Description

Objectives: Outline the importance of organelles and sub-cellular compartments • Describe the structure of the plasma membrane and outline its importance to cell function • Outline mechanisms by which substances traverse the plasma membrane

Resource summary

Question 1

Question
Which is NOT a function of membranes?
Answer
  • Separation of incompatible processes
  • Creation of concentration gradients
  • Packaging for transport
  • Digestion of debris

Question 2

Question
Which statements about the plasma membrane are CORRECT?
Answer
  • It is a fluid phospholipid bilayer with proteins and other lipids incorporated into it.
  • It is permeable to hydrophobic molecules like steroid hormones.
  • It restricts entry of hydrophilic and ionic (charged) molecules/
  • It is always saturated.

Question 3

Question
Cholesterol acts as a fluidity buffer for the plasma membrane as it makes the phospholipid layer more viscous, but also lowers its solidifying point,
Answer
  • True
  • False

Question 4

Question
Proteins are unspecific to cell type.
Answer
  • True
  • False

Question 5

Question
There are two types of transport in regards to energy transfer: passive and active. Passive is from [blank_start]high to low[blank_end] concentration, "[blank_start]down[blank_end]" a gradient. Active is from [blank_start]low to high[blank_end] concentration, "[blank_start]up[blank_end]" a gradient.
Answer
  • high to low
  • down
  • low to high
  • up

Question 6

Question
Facilitated diffusion is a form of [blank_start]passive[blank_end] transport where molecules are too large to diffuse through a membrane on their own. Facilitated diffusion involves [blank_start]channels, or carrier proteins[blank_end]. Channels can be "leak" channels where molecules can [blank_start]freely[blank_end] move, or they can be gated. Voltage-gated channels respond to changes in [blank_start]charge[blank_end] whereas ligand-gated channels respond to [blank_start]chemical signals[blank_end].
Answer
  • passive
  • channels or carrier proteins
  • freely
  • charge
  • chemical signals

Question 7

Question
Active transport utilises [blank_start]proteins[blank_end] that act as pumps which use [blank_start]ATP[blank_end] to move molecules [blank_start]up[blank_end] a concentration gradient. This is important for maintaining [blank_start]concentration[blank_end] of ions, and can be direct or indirect. A classic example is the [blank_start]sodium-potassium[blank_end] pump.
Answer
  • ATP
  • up
  • concentration
  • sodium-potassium
  • proteins

Question 8

Question
Which of the following is not a function of proteins?
Answer
  • Signal transduction
  • Cell recognition
  • Linking of membranes to the cytoskeleton or ECM
  • Linking of cells
  • Linking of organelles
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