Membranes, cell signaling, signal transduction, metabolism, Ion channels/pumps Flashcards
A type of bulk transport used by cells to take in only very specific molecules is referred to
as_______
active transport pinocytosis receptor mediated endocytosis facilitated diffusion phagocytosis
receptor mediated endocytosis
Which of the following factors would tend to increase membrane fluidity?
Phospholipids with saturated fatty acids
Transmembrane proteins
Peripheral membrane proteins
All options are correct
Phospholipids with unsaturated fatty acids
Phospholipids with unsaturated fatty acids
Normal physiological state for a plant cell occurs when placed in\_\_\_\_\_\_\_\_ All options are correct hypotonic solution hypertonic solution isotonic solution
hypotonic solution
In a neuron, during membrane depolarization which of the following happens?
Some gated Na+ channels open, Na+ flows inside cells
Water leaves the cell
K+ channels open, K+ flows inside cells
Na+ channels close, Na+ stays inside cells
Some gated Na+ channels open, Na+ flows inside cells
Ions can be transported across membranes down their concentration gradient. This type of movement is called\_\_\_\_\_\_\_ active transport osmosis facilitated diffusion simple diffusion All options are correct
facilitated diffusion
If a plant cell with solute concentration of 1 M is placed in a beaker with a solute concentration of 5 M, then the plant cell is ________ to the solution and the solution is ________ to the plant cell.
hypertonic, hypotonic hypertonic, isotonic isotonic, hypotonic isotonic, isotonic hypotonic, hypertonic
hypotonic, hypertonic
Which one of the following membrane structures is responsible for facilitated diffusion of molecules across membranes?
phospholipids cholesterol carbohydrates fats channel proteins
channel proteins `
Transport across membranes requires energy from ATP in all except which of the following?
facilitated diffusion
K+ ions moving into a cell using Na+/K+ pump
active transport
H+ pump
Na+ ions moving out of the cell through Na+/K+ pump
facilitated diffusion
Which one of the following is not true about signal transduction pathways?
ATP is used in signal transduction pathways
Signal transduction is used to amplify the original signal
There is only one type of signal transduction pathway in each cell
Phosphorylation cascades are one type of signal transduction pathway
There is only one type of signal transduction pathway in each cell
Sucrose is taken up by plant cells against its concentration gradient using the Sucrose-H+ cotransporter. What is the source of energy for this transport?
Its own concentration gradient ATP The Na+/K+ pump The H+ gradient GTP
The H+ gradient
When a neuron responds to a particular neurotransmitter by opening gated ion channels, the neurotransmitter is serving as which part of the signaling pathway?
signal second messenger ion channel receptor response transduction protein
signal
An organism that has adapted to survive in extremely cold environments will be expected to have which of the following adaptations in its membrane?
only transport proteins
only proteins with enzymatic functions
phospholipids with predominantly saturated fatty acid tails
many integral membrane proteins
phospholipids with predominantly unsaturated fatty acid tails
phospholipids with predominantly unsaturated fatty acid tails
When epinephrine (a hydrophilic signal molecule) binds to a G-protein coupled receptor, which of the following is the correct order of events that follow?
- Activation of the G-protein coupled receptor
- GTP is substituted for GDP on the G-protein
- Activation of protein kinase A
- Activation of Adenylyl cyclase
1, 2, 3, 4 4, 3, 2, 1 4, 1, 3, 2 1, 2, 4, 3 1, 3, 2, 4
1, 2, 4, 3
Complete the following sentence:
A steroid hormone, Aldosterone, functions inside a cell by _________.
intitiating a phosphorylation cascade that increases glycogen metabolism
acting as a steroid signal receptor that activates channel proteins
blocking the function of phosphodiesterase
binding with a receptor protein that enters the nucleus and activates gene expression
becoming a second messenger that inhibits adenylyl cyclase
binding with a receptor protein that enters the nucleus and activates gene expression
Sugars move across membranes down their concentration gradient. This is an example of what mode of transport?
Facilitated diffusion
