What property prevents the ligands of cell-surface receptors from entering the cell?
the molecules bind to the extracellular domain.
the molecules are hydrophilic and cannot penetrate the hydrophobic interior of the plasma membrane.
the molecules are attached to transport proteins that deliver them through the bloodstream to target cells.
the ligands are able to penetrate the membrane and directly influence gene expression upon receptor binding.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.

idk what happened..you tell

not always but somethings can be reproduced in a laboratory.