Which vesicular transport process occurs primarily in some white blood cells and macrophages that attack pathogens?

A. All the isotopes of the same element react differently: Isotopes generally exhibit the same chemical behavior because they have the same number of protons and electrons, which determine chemical reactivity.

B. Isotopes occur only in the heavier elements: Isotopes are found in both light and heavy elements; they are variations of an element with differing numbers of neutrons, not limited to heavy elements.

C. All the isotopes of an element have the same number of neutrons but differing numbers of electrons: Isotopes have the same number of protons (and electrons if neutral) but differ in neutron number.

D. Isotopes of the same element have the same atomic number but differ in their atomic mass (weight) number: Isotopes share the same number of protons (atomic number) but have different numbers of neutrons, which changes their mass number.

A. Ionic: Ionic bonds involve the complete transfer of electrons from one atom to another, creating oppositely charged ions that attract each other. In water, oxygen and hydrogen share electrons rather than transfer them.

B. Peptide: Peptide bonds form between amino acids during protein synthesis, linking the carboxyl group of one amino acid to the amino group of another. Since water is a simple molecule, not a protein, peptide bonds are not involved in its formation.

C. Polar covalent: Polar covalent bonds occur when atoms share electrons unequally due to differences in electronegativity. In water, oxygen pulls the shared electrons closer to itself, creating a partial negative charge on oxygen and partial positive charges on the hydrogens.

D. Nonpolar covalent: Nonpolar covalent bonds involve equal sharing of electrons between atoms with similar electronegativity. Because oxygen is more electronegative than hydrogen, the sharing in water is unequal.