Question

a covalent bond is a bond in which
o electrons are attracted to each other by electromagnetic forces
a proton is shared between two atoms
o one atom donates an electron to the other
electrons from the outer shells of two atoms are equally shared
nudeic acids such as dna and rna are composed of three main molecules _, _, and _.
o phosphate, fatty acids, nitrogenous base
a sugar, phosphate, nitrogen
o amino group, carboxyl group, a sugar
a sugar, phosphate, nitrogenous base
the main difference between a saturated and unsaturated fatty acid is that saturated fatty acids
havewer hydrogen atoms bound to carbon than unsaturated fatty acids.
have more carboxylic acid groups than unsaturated fatty acids.
have all their carbon atoms bonded to the maximum number of hydrogens.
have more carbons in the hydrocarbon chains.

Explanation:

First question

A covalent bond is formed when electrons from the outer shells of two atoms are shared. Electrons are not attracted to each other by electromagnetic forces in the context of covalent bond formation (they are attracted to nuclei). Protons are not shared in bonds. One - atom donating an electron to another is an ionic bond.

Nucleic acids (DNA and RNA) are composed of a sugar (deoxyribose in DNA, ribose in RNA), a phosphate group, and a nitrogenous base. Fatty acids are part of lipids, not nucleic acids. Nitrogen is not a molecule component in the way described for nucleic acids. Amino and carboxyl groups are part of amino acids (proteins).

Saturated fatty acids have all their carbon atoms bonded to the maximum number of hydrogens (single bonds between carbon atoms). Unsaturated fatty acids have double bonds between some carbon atoms, which means they have fewer hydrogen atoms bonded to carbon compared to saturated fatty acids. Both saturated and unsaturated fatty acids have one carboxyl group. The number of carbons in the hydrocarbon chain is not the main difference between saturated and unsaturated fatty acids.

Answer:

electrons from the outer shells of two atoms are equally shared

Second question