UNIT 2: 20 QUESTIONS REVIEWER

Chemical level of organization

At which level of organization in the human body do atoms and molecules form basic structural and functional units such as proteins and DNA?

A mole is a unit of mass equal to the atomic weight of the element.

What is the relationship between a mole (mol) and the atomic weight of an element?

Compound

 It is believed to have two or more atoms of different elements joined by strong or weak bonds.

Colloid

It is a solution containing the dispersed proteins or other large molecules.

Electrolytes and body fluids

These are inorganic ions that conduct electricity in solution. It is also mentioned that it seriously imbalance disturbs vital body functions.

Atomic weight

It is an average of the different atomic masses and proportions of different isotopes

Amino acids

Two or more atoms joined by strong bonds.

All of the above

Which molecules are considered the building blocks of life and form the chemical level of organization in the body?

1. Proteins

2. Carbohydrates

3. Lipids

4. All of the above

Amino acids

What is the basic structural unit of proteins?

Proteins

Which of the following is a key component at the chemical level of organization in the human body?

Breaking down glucose into ATP

Which of the following is an example of a catabolic reaction?

Enzymes

These are the protein catalyst that lower the activation energy of reactions.

Isotopes

Versions of elements based on mass number

Nucleic acids

Which of the following macromolecules is primarily responsible for storing genetic information in cells?

Carbohydrates

Which of the following substances serves as the primary source of energy for cellular processes?

Nonpolar covalent bonds involve equal sharing of electrons between atoms.

Which of the following statements accurately describes nonpolar covalent bonds?

• Nonpolar covalent bonds involve unequal sharing of electrons between atoms.

• Nonpolar covalent bonds involve equal sharing of electrons between atoms.

• Nonpolar covalent bonds occur when one atom has a disproportionately strong pull on the electrons.

• Nonpolar covalent bonds do not exist in nature.

Element

A _________  is a pure substance composed of atoms of one kind.

Chemicals

Which of the following represents the simplest level of organization in the human body, consisting of atoms and molecules?

Molecular Weight

The _________ of a molecule or compound is the sum of the atomic weights of its atoms.

Atoms

An element is composed of __________.