Week Two Flashcards
(8 cards)
How is H+ transported across the membrane
a) facilitated transport (carrier)
b) bulk transport (endocytosis)
c) active transport
d) facilitated transport (channel)
e) osmosis
c) active transport
the molecule used to pump the hydrogen across the membrane is composed of:
a) amino acids
b) carbon and hydrogen
c) nucleotides
d) fatty acids
e) ionic bonds
a) amino acids
Why don’t hydrogen ions “leak” back into the cells
a) they are nonpolar which means they don’t cross membranes
b) as charged particles, they are unable to cross the membrane without channel proteins
c) osmosis requires water
d) active transport only occurs in one direction
e) A & C
b) as charged particles, they are unable to to cross the membrane without channel proteins
a membrane that is permeable to iodine (I) but not starch (S) is placed between solutions of iodine and starch. Net diffusion will continue until:
a) all of the starch is on the right side.
b) diffusion can only occur if the membrane is permeable to both solutes
c) all of the iodine is on the left side
d) equal concentrations of iodine are found on both sides
e) concentrations of both solutes are equal on both sides of the membrane
d) equal concentrations of iodine are found on both sides
Which of the following is not a property of all living cells?
a) metabolism
b) they require oxygen
c) homeostasis/regulation
d) reproduction
e) growth and development
b) they require oxygen
Liver cells remove toxins such as alcohol from the blood. Which organelle would you expect to find a lot of in those cells?
a) ribosomes
b) vesicles
c) mitochondria
d) Golgi apparatus
e) smooth endoplasmic reticulum
e) smooth endoplasmic reticulum
Which of the following sequences best illustrates the idea of increasing levels of complexity
a) molecule, cell, tissue, organ, organism
b) cell, tissue, molecule, organ, organism
c) molecule, tissue, cell, organism, organ
d) organism, organ, tissue, cell, molecule
e) tissue, molecule, cell, organ, organism
a) molecule, cell, tissue, organ, organism
Describe facilitated diffusion?
what conditions are necessary (membrane structures, energy, concentration gradient)
