Question

the elements of life: building blocks of living organisms
all living things are made up of complex molecules that are essential for growth, repair, and reproduction.
these molecules are mostly built from carbon, hydrogen, oxygen, and nitrogen, with carbon being the key
clement because it can form four bonds and create many different structures. the main types of molecules
of life are carbohydrates, lipids, proteins, and nucleic acids. these molecules are assembled from smaller
building blocks called monomers, which combine to make large polymers. carbohydrates provide energy and
structure; lipids store energy and make up cell membranes, proteins perform countless functions in the body,
and nucleic acids like dna and rna store genetic information. hydrocarbons are chains of carbon and
hydrogen, and adding different functional groups like hydroxyl or carboxyl can change their properties and
make them more reactive. the way these molecules are built and interact is the foundation for all life on earth.
fill in the blank: fill in the blank with the correct words.
word bank: dna monomers oxygen hydrocarbons carbon

1. the key element in all biological molecules, which can form four bonds, is ________.
2. the small building blocks of large biological molecules are called ________.
3. carbohydrates are made up of carbon, hydrogen, and ________.
4. chains of carbon and hydrogen atoms are called ________.
5. the genetic information of all living things is stored in the molecule called ________.

multiple choice questions: choose the correct answer from the choices for each question.

1. which element is considered the main building block of life?

a) oxygen
b) carbon
c) nitrogen
d) hydrogen

1. what is a polymer?

a) a simple sugar
b) an amino acid
c) a type of lipid
d) a chain of repeated monomers

1. which of the following is not a main class of biological molecule?

a) carbohydrates
b) lipids
c) proteins
d) metals

Explanation:

1. Carbon is the key element in biological molecules as it can form four bonds.
2. Monomers are the small building blocks of large biological molecules.
3. Carbohydrates have carbon, hydrogen, and oxygen.
4. Hydrocarbons are chains of carbon and hydrogen.
5. DNA stores genetic information.

For multiple - choice:

1. Carbon is the main building block of life.
2. A polymer is a chain of repeated monomers.
3. Metals are not a main class of biological molecule.

Answer:

Fill in the Blank:

1. carbon
2. monomers
3. oxygen
4. hydrocarbons
5. DNA

Multiple Choice:

1. b) Carbon
2. d) A chain of repeated monomers
3. d) Metals