Pe 220 Notes Exam 2
PE 220 EXAM 2 NOTE Cards
Term
Which of the following is an amphipathic molecule?
Definition
integral membrane protein
Term
If the direction of the net flux of an ion is against its electrochemical gradient, then that transport is passive.
Definition
False
Term
Of the gradients listed below, which is the most accurate description of the force that ultimately determines the movement of ions across the membrane?
Definition
Electrochemical gradient
Term
Which of the following pairs of characteristics is more likely to make a substance diffuse through the cell membrane?
Definition
small, non-polar molecule
Term
In facilitated diffusion, ________.
Definition
a molecule is moved with its concentration gradient with the assistance of a protein carrier molecule, and no energy is required
Term
What organelle synthesizes most of the ATP used by cells?
Definition
mitochondria
Term
Where is the genetic code stored?
Definition
nucleus
Term
When molecules are passively transported across a membrane, the direction of their movement is dictated by the molecule's tendency to move ________.
Definition
from higher to lower energy
Term
Which of the following is an example of an endogenous fat from an exogenous source?
Definition
triglycerides
Term
Which of the following organelles is specialized for lipid and steroid synthesis?
Definition
smooth endoplasmic reticulum
Term
What organelle packages proteins into secretory vesicles?
Definition
Golgi apparatus
Term
Molecules with a relatively high lipid solubility are capable of crossing the membrane ________.
Definition directly across the lipid bilayer
Term
Anabolism describes the breakdown of large molecules to smaller molecules.
Definition
False
Term
In facilitated diffusion, the carrier protein has equal affinity for the molecule being transported on both sides of the membrane.
Definition
True
Term
When proteins are synthesized by ribosomes on the rough endoplasmic
Term
Which of the following is an amphipathic molecule?
Definition
integral membrane protein
Term
If the direction of the net flux of an ion is against its electrochemical gradient, then that transport is passive.
Definition
False
Term
Of the gradients listed below, which is the most accurate description of the force that ultimately determines the movement of ions across the membrane?
Definition
Electrochemical gradient
Term
Which of the following pairs of characteristics is more likely to make a substance diffuse through the cell membrane?
Definition
small, non-polar molecule
Term
In facilitated diffusion, ________.
Definition
a molecule is moved with its concentration gradient with the assistance of a protein carrier molecule, and no energy is required
Term
What organelle synthesizes most of the ATP used by cells?
Definition
mitochondria
Term
Where is the genetic code stored?
Definition
nucleus
Term
When molecules are passively transported across a membrane, the direction of their movement is dictated by the molecule's tendency to move ________.
Definition
from higher to lower energy
Term
Which of the following is an example of an endogenous fat from an exogenous source?
Definition
triglycerides
Term
Which of the following organelles is specialized for lipid and steroid synthesis?
Definition
smooth endoplasmic reticulum
Term
What organelle packages proteins into secretory vesicles?
Definition
Golgi apparatus
Term
Molecules with a relatively high lipid solubility are capable of crossing the membrane ________.
Definition directly across the lipid bilayer
Term
Anabolism describes the breakdown of large molecules to smaller molecules.
Definition
False
Term
In facilitated diffusion, the carrier protein has equal affinity for the molecule being transported on both sides of the membrane.
Definition
True
Term
When proteins are synthesized by ribosomes on the rough endoplasmic