Question

a covalent bond is formed by the sharing of _____, whereas an ionic bond is formed by the _____. * 1 point
neutrons; sharing of electrons
electrons; electric attraction between two neutral atoms
protons; electric attraction between two neutral atoms
protons; sharing of electrons
electrons; transfer of electrons from one atom to another

the molecule shown is a(n) 1 point
polysaccharide
saturated fatty acid
unsaturated fatty acid
polypeptide
amino acid

which is a true statement about phospholipids is true? * 1 point
it contains two hydrocarbon chains bound to glycerol by ester bonds.
it is composed of hydrocarbon chain and a carboxyl group.
it is a carbohydrate linked to a hydrocarbon chain.
it contains glycerol and a carboxyl group.
they become saturated at low ph.

the amino acids leucine and valine have hydrocarbon side chains made up of c - h and c - c bonds; therefore, * 1 point

Explanation:

1. A covalent bond involves sharing of electrons between atoms, while an ionic bond is formed by the transfer of electrons from one atom to another.
2. The molecule shown has a long - chain with a double bond and a carboxyl group at one end, which is characteristic of an unsaturated fatty acid. Saturated fatty acids have no double bonds, polysaccharides are made of sugar monomers, polypeptides are chains of amino acids, and amino acids have an amino and a carboxyl group and a side - chain attached to a central carbon.
3. Phospholipids contain two hydrocarbon chains bound to glycerol by ester bonds. The other options do not correctly describe the structure of phospholipids.
4. Amino acids with hydrocarbon side - chains like leucine and valine are non - polar because C - H and C - C bonds are non - polar.

Answer:

1. electrons; transfer of electrons from one atom to another
2. unsaturated fatty acid
3. It contains two hydrocarbon chains bound to glycerol by ester bonds.
4. non - polar (missing option in the original question text but this is the correct property based on the description)