Chemistry of Life Test

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An enzyme is

a biological catalyst

Which statement correctly relates to DNA and RNA?

RNA reads and translates the DNA code

Phospholipids

help the cell membrane to conserve internal fluids

Ionic bonds usually hold ______ compounds together

inorganic

What is necessary for reactants to combine chemically?

input of energy

A decomposition reaction occurs when

ionic or covalent bonds are broken and elements, ions, or simpler molecules are formed

cholesterol

lipid

DNA contains _____ sugar

deoxyribose

Genetic codes contain

complex information; detailed instructions

Starch is made up of

units of C6H12O6

When salts are dissolved in water

the components separate into ions

T/F A molecule may consist of 2 similar elements chemically bonded

True

T/F Carbon is ideally suited to form covalent bonds

True

T/F Organic compounds form polymers

True

T/F Organic compounds usually contain many atoms

True

When fats decompose in an organism, energy is released

True

In the process of ionic bonding

outer energy level electrons are gained and lost

RNA contains ____ sugar

ribose

Electrons of a neutral atom always equal

the number of protons

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

the release of energy

An atom that has 12 protons in its nucleus has an atomic number of

12

T/F A hydrogen bond is completed by the transfer of its sole electron to another element

False

T/F All the subatomic particles participate in chemical reactions

False

T/F Carbohydrates always contain protein

False

T/F Starch is a monosaccharide

False

T/F The 4 organic molecules found in organisms are carbohydrates, proteins, nucleic acids and amino acids

False

Decomposition reaction

Starch being broken down into sugar

electrons

The subatomic particles/units which govern chemical reactions among elements

T/F A compound consists of 2 or more distinct atoms

True

proteins

antibodies, certain hormones, hemoglobin

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

Decomposition example

breakdown of a polysaccharide into monosaccharides

sugar

carbohydrate

AB--A+B

decomposition reaction

Water found in animal and human cells is most often found in the _______ phase of matter

liquid

DNA

nucleic acid

In bonding of any type, the _____ level electrons are involved

outer

Oxygen is found in the ______ phase of matter

oxygen

hemoglobin

protein

Carbohydrates

quick source of energy; most are monosaccharides

Catalysts and enzymes are known to _____ a chemical reaction

speed up

Which processes are involved in metabolism?

synthesis, growth, repair, decomposition, energy release, reversible reactions, equilibrium, exchange reactions, control of PH


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