Protein helps your body repair cellsand make new ones.

All nine essential amino acids are required for human survival. Protein is necessary for the formation of bones and other body structures, such as muscles, but it also serves other functions. Protein is involved in nearly every cellular process. Protein is involved in metabolic reactions, immunological responses, supplies energy, aids in cellular repair, helps create blood cells, and more.

I compare protein to tape because as you can see at the photo above, it fixed the broken phone stand and just like protein also it repairs your cells

Carbohydrates, or carbs, are sugar molecules. Along with proteins and fats, carbohydrates are one of three main nutrients found in foods and drinks. Your body breaks down carbohydrates into glucose. Glucose, or blood sugar, is the main source of energy for your body's cells, tissues, and organs. Carbohydrates provide the body with glucose, which is converted to energy used to support bodily functions and physical activity. 

Like carbohydrates, motor cycle’s engine provides power to motorcycle and enable it to move.

Proteins are important that play many critical roles in the body. It is required to heal muscle and helps the body to gain weight, grow and repair organs. These proteins provide structure and support for cells

. As you can see in the image above balloon represent a muscle and the band-aid as a protein that helps the muscle to heal and repair. 

Lipids are organic compounds that are used by cells as building blocks for the synthesis of

long-term energy stores. They are hydrophobic and insoluble in water because they have hydrocarbon chains that are nonpolar and repellent to water. It is important because it store energy and plays an important role in living organisms. It is also use for protection and lubrication. 

From the image above refrigerator, cabinet and gas tank are things that is similar to lipids because they can be used as a storage just like lipids. 

Of all biological molecules, the most fundamental constituents of living cells are nucleic acids. Their primary function is to store and transmit genetic information in every cell of living organisms. Much of an organism’s physical and functional development throughout life is programmed in these molecules.

I used AC adaptor and application like Gmail because they likely similar to nucleic acid, to store information, transmit and provide power for your laptop.