[Answer] 2. A group of organic molecules that we encounter regularly in our food is carbohydrates. Which of these elements is NOT found in a carbohydrate molecule?

Step 1 : Introduction to the question "2. A group of organic molecules that we encounter regularly in our food is carbohydrates. Which of these elements is NOT found in a carbohydrate molecule?"

...1. Carbon 2. Oxygen 3. Hydrogen 4. Nitrogen Carbohydrates contain carbon, hydrogen and oxygen. They usually have twice as many hydrogen atoms as carbon atoms, the same ratio as is found in water, which is the source of the -hydrate part of their name. For a chemist, carbohydrates include not only the large molecules that dieticians usually mean when they use the term, but also small molecules such as the monosaccharide glucose (blood sugar) and the disaccharide sucrose (table sugar).

[Answer] What is the life process called in which ingested food is broken down into simple molecules which are then able to be absorbed and used by the body?

Step 1 : Introduction to the question "What is the life process called in which ingested food is broken down into simple molecules which are then able to be absorbed and used by the body?"

...You take a bite out of your apple. As you continue masticating it, chemicals in your saliva begin the digestion process. The bit of apple is broken down into smaller and smaller pieces until it reaches the state of its most basic chemical make up. As it makes its way through the stomach, more enzymes and liquids are added to the mix so that all vitamins, minerals and life-giving components are set free to be absorbed in the intestinal lining. Undigestible matter such as fiber and other waste material are eliminated at the other end. The sum of all these various processes is known as digestion.

[Answer] mammalian steroid hormones are signaling molecules that function in which of the following types of cell signaling?

Step 1 : Introduction to the question "mammalian steroid hormones are signaling molecules that function in which of the following types of cell signaling?"

...Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct. The major glands of the endocrine system include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus and adrenal glands.