(t or f) small, hydrophilic molecules cannot just flow into the cell, they need to pass through the plasma membrane

True. The plasma membrane is made up of a phospholipid bilayer and a hydrophobic core. Hydrophilic molecules are thus unable to pass through the hydrophobic core and often need the help of transporter proteins or carrier proteins to pass through, or if it is a signalling molecule, it will utilise receptors to pass the signal into the cell.

Bookpagechapter letter sentence word1

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass