What type of receptor is described in the following paragraph? An electrical signal may be triggered by the diffusion of ions. This signal moves down the receiving cell. The neurotransmitter molecules that are released between two nerve cells bind to which of the following channels?

Intracellular receptor
Receptor tyrosine kinase
G protein-coupled receptor
Ligand-gated ion channel

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

What are the doorways into and out of cells, attached to the membrane, and built in the rough er.

Scenario #2 in 2001, a population of 2,500 poison dart frogs lived in the amazon rain forest. due to increased deforestation, the population dwindled to 25 frogs in 2019. new government regulations were enacted in 2022, successfully putting an end to the deforestation of the amazon rain forest. once deforestation was stopped, the poison dart frog population was able to recover. by 2050, the population reached 8,000 frogs, of that population, 20 are homozygous recessive for being spotted (ss genotype). q2- ? q- p- p2- 2pq-