Proteins are composed of amino acids linked together by peptide bonds. Nucleic acids are linked by phosphodiester bonds and polysaccharides are held together by glycosidic linkages. Lipid polymers are linked by simple covalent bonds.

In DNA, guanine will always pair with cytosine (C-G) and adenine will always pair with thymine (A-T). In RNA, thymine is replaced with the pyrimidine uracil, meaning that adenine will pair with uracil in RNA (A-U). Guanine and uracil will never be paired together.

DNA is composed of three key components. The backbone of the molecule is made of deoxyribose sugars and phosphate groups. The coding region of DNA is composed of the nitrogenous bases: adenine, thymine, cytosine, and guanine.

A single subunit of DNA is composed of one deoxyribose, one phosphate, and one nitrogenous base. This subunit is called a nucleotide.

A nucleoside is a nucleotide without a phosphate group: only a deoxyribose sugar and a nitrogenous base.

Amino acids are the subunit for proteins, and are not found in DNA.

Proteins are made up of a string of amino acids. Ribosomes are responsible for facilitating the formation of covalent peptide bonds between amino acids to build the polypeptide chain. Proteins called chaperones then help fold the protein into the proper shape.

Nucleotides are found in DNA and ribonucleotides are found in RNA. Nucleosomes are small regions of DNA that are tightly wound around histone proteins. Phosphates are functional groups made of one phosphorus atom and four oxygen atoms. Phosphates are found in numerous molecules, including DNA, RNA, and phospholipids in the cell membrane, but are not generally found in proteins.

The question states that the pump transports ions against their concentration gradient. This means that this pump must use active transport. Recall that active transport requires energy in the form of ATP. ATP, or adenine triphosphate, is a type of nucleotide because it contains a nitrogenous base, a pentose sugar, and phosphate groups.

Lipids and carbohydrates (such as glucose) are the energy source for the body; however, these macromolecules themselves do not provide energy for cellular processes. They undergo metabolism and generate ATP, the molecule used by cellular processes that require energy.

Primary protein structure is the sequence of the amino acids, linked by peptide bonds. Secondary protein structure involves  helices and  pleated sheets formed by hydrogen bonds between backbone amino and carboxyl groups. Tertiary protein structure involves electrostatic interactions between the R groups of the amino acids in the polypeptide. The tertiary structure of a protein may be globular or filamentous, and may include disulfide bonds and/or salt bridges. Quaternary protein structure involves interactions between two or more polypeptide chains.

Enzymes are polypeptides. Polypeptides are created from proteins/amino acids. They contain a nitrogen, and have a nitrogen-carbon-carbon  backbone.  

Carbohydrates are referred to as polysaccharides when they form large molecules. They function as energy storage, and are responsible for the structure of plant cell walls. They are made of carbon, hydrogen, and oxygen.

Lipids in large molecules make up fats, oils, waxes, and phospholipids. They provide membrane structure, energy storage, and insulation. They are also made of carbon, hydrogen, and oxygen, and contain numerous carbon-hydrogen bonds. 

Nucleic acids (DNA and RNA) are made of chains of nucleotides, bound together by phosphodiester bonds.

All amino acids have a carboxyl end, and an amino end, both of which contain the same respective atoms. The main differences in amino acids come from the different side chains contained by each amino acid.

The N terminus is the end of the protein with the amino group——exposed, and the C terminus is the end of the protein with the carboxyl group——exposed. 

Proteins have six main functions: 1) movement (e.g. actin and myosin), 2) structure (e.g. keratin), 3) transport (e.g. hemoglobin), 4) protection (e.g. antibodies), 5) communication (e.g. hormones), 6) and catalyzation of chemical reactions (e.g. enzymes).