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