Unit 2 - Chemistry of Life - Test: Chemistry of Life

An enzyme is:

a biological catalyst

Starch being broken down into sugar in the body is a(n)_____________ reaction.

decomposition

The breakdown of a polysaccharide into monosaccharides is an example of _____.

decomposition

DNA is different from RNA in its function and also in its structure. DNA contains ______ and RNA contains _______ sugar.

deoxyribose, ribose

The decomposition reaction is:

AB ---> A + B

A hydrogen bond is completed by the transfer of its sole electron to another element. True or False

False

All the subatomic particles participate in chemical reactions. True or False

False

Carbohydrates always contain protein. True or False

False

Starch is a monosaccharide. True or False

False

The four organic molecules found in organisms are carbohydrates, proteins, nucleic acids, and amino acids. True or False

False

When fats decompose in an organism, energy is released. True or False

True

Identify the substance. sugar

carbohydrate

Check the correct statements regarding a compound and a molecule: - A compound consists of two or more distinct atoms - a molecule is only found as the subunit of a compound - a molecule may consist of two similar elements chemically bonded - a compound consists of any two or more atoms chemically bonded

A compound consists of two or more distinct atoms a molecule is only found as the subunit of a compound

Identify the substance. cholesterol

lipid

Catalysts and enzymes are known to _____ a chemical reaction, but not be consumed in the reaction.

speed up

Starch is made up of:

units of C6H12O4

When salts are dissolved in water:

the components separate into ions

A chemical reaction in your body in which bonds are broken is associated with:

the release of energy

An atom that has twelve protons in its nucleus has an atomic number of:

12

Complete the energy maximum electron capacity for each energy level. Energy Level 1 maximum electron capacity is _____ . Energy Level 2 maximum electron capacity is ______ . Energy Level 3 maximum electron capacity is ______ . Energy Level 4 maximum electron capacity is ______.

2, 8, 18, 32

_____ help the cell membrane to conserve internal fluids.

Phospholipids

Which statement correctly relates to DNA and RNA?

RNA reads and translates the DNA code

Carbon is ideally suited to form covalent bonds. True or False

True

Organic compounds form polymers. True or False

True

Organic compounds usually contain many atoms. True or False

True

Which processes are involved in metabolism? synthesis, growth, repair decomposition, energy release reversible reactions, equilibrium synthesis and decomposition exchange reactions, control of pH all of the above

all of the above

When a substance dissociates into OH- ions, they are classified as ______.

bases

Why can carbon bond to many elements simultaneously?

because it is capable of forming multiple covalent bonds

A(n) _______ reaction occurs when ionic or covalent bonds are broken and elements, ions, or simpler molecules are formed.

decomposition

Genetic codes contain: random data detailed instructions accidental complexity non functional chance information complex information

detailed instructions complex information

The subatomic particles/ units which govern potential chemical reactions among elements are:

electrons

Ionic bonds usually hold ______ compounds together.

inorganic

What is necessary for reactants to combine chemically?

input of energy

Water found in animal and human cells is most often found in the ______ phase of matter, and oxygen is found in the ______ phase of matter.

liquid, gas

Identify the substance. DNA

nucleic acid

In bonding of any type, the ______ level electrons are involved.

outer

In the process of ionic bonding:

outer energy level electrons are gained and lost

Identify the substance. hemoglobin

protein

Antibodies, certain hormones, and hemoglobin are all:

proteins

Which statements are correct relative to carbohydrates? quick source of energy only source of fuel polymers formed by hydrolysis most are monosaccharides consists of carbon, hydrogen and nitrogen

quick source of energy most are monosaccharides

Which statement is correct? - atomic weight is identical to atomic mass - neutrons always equal the number of electrons - electrons of a neutral atom always equal the number of protons - neutrons always equal the number of protons

- electrons of a neutral atom always equal the number of protons