Answer: (B) At the exterior surface
Explanation:
G protein-linked receptors (GPLR) are also called G protein-coupled receptors, 7-Transmembrane receptors or heptahelical receptors. They conform a large protein family of receptors.
They helps to detect molecules (ligands) outside the cells. (At the exterior surface).
The LIGANDS that binds and activate these receptors include light-sensitive compounds (Opsins), odorants (olfactory receptors), pheromones (vomeronasal receptors which are situated near the vomer bone between the nose and the mouth), hormones and neurotransmitters (serotonin, dopamine, glutamate etc).
Let's take a bird's eye view at it.
° When a Ligand binds with a G protein-linked receptors (which occurs at the exterior surface), it undergoes a conformational change.
° As conformational change occurs, GPLR become active and interact with the G-proteins Heterotrimeric Subunits ( G-alpha, G-beta, G-gamma) in the plasma membrane (at the cytosol surface).
This step typically explains the ambiguity. i.e GPLRs receptors interacts with signaling ligands via the exterior surface but communication between GPLRs and G-proteins Heterotrimeric Subunits occurs in the cytosol membrane.
Hence, this Conformational Change then triggers the interaction between the GPLRs and a nearby G proteins.
I hope that helps!.
primary consumers
secondary consumers
decomposers
Producers Because that's the answer.
Answer:
photosynthesis
Explanation:
Chlorophyll a absorbs the wavelengths of violet-blue and orange-red light and functions as a primary electron donor during the election transport chain in photosynthesis. It also functions in transporting energy to the reaction center where P680 and P700 are located.
B) global warming, resulting in warmer temperatures on Earth.
C) more people going to the area for recreation and vacations.
D) animals leaving the tundra for warmer regions with less snow cover.
Answer: B) global warming, resulting in warmer temperatures on Earth.
Explanation:
Tundra is the coldest biome of the world. It exhibit very low temperature range and treeless plain with snow precipitation. The global warming is the phenomena which is related with rise in global temperature due to abundance of greenhouse gases into the atmosphere. These gases are released into the atmosphere by burning of fossil fuels, industrial gaseous release and deforestation. These gases traps the heat energy from sunlight making the atmospheric temperature warm. As a result of global warming the ice caps and snow bearing areas of the tundra biome will deplete. The melting of the ice will provide proper unfrozen soil for the growth of plants. Hence, new plants will increase in numbers due to global warming.
A.
decreased appetite due to the production of hormones that indicate fullness
B.
paralysis due to lack of action potentials to signal muscle tissue
C.
increased heart rate due to increased nerve impulses to the heart muscles
D.
blindness due to proteins in the eyes denaturing and losing functionality
Paralysis due to lack of action potentials to signal muscle tissue- this symptom most likely would occur in an organism exposed to tetrodotoxin.
Tetrodotoxin is a potent neurotoxin found in pufferfish, porcupinefish and blue-ringed octopus.
Has tetrodotoxin (TTX) in blue-ringed octopuses venom which causes pain and neurotoxic effects(paralysis) by inhabiting signal transduction by nerve cells through sodium channel blockade.
A dose of venom can shut down muscles such as those that keep you breathing and cause death within 30 minutes.
The correct answer is option B.
Learn more about tetrodotoxin, refer:
#SPJ2
)B paralysis. Tetrodotoxin works by inhibiting the firing of action potentials in neurons by binding to the voltage-gated sodium channels in nerve cell membranes and blocking the passage of sodium ions into the neuron. This prevents the nervous system from carrying messages, eventually leading to paralysis
Answer:
Shape and size vary from cell to cell according to their functions and composition. For example, a nerve cell is long and branched, meant for the transmission of signals throughout our body while a muscle cell is small and spindle-shaped which helps in movement.
Explanation: