TEST: CHEMISTRY OF LIFE
An enzyme is: a biological catalyst a biological reactant a biological product a biological co-factor
a biological catalyst
DNA is different from RNA in its function and also in its structure. DNA contains _________________ sugar and RNA contains ________________________ sugar.
deoxyribose ribose
Carbohydrates always contain protein. True False
False
Starch is a monosaccharide. True False
False
The four organic molecules found in organisms are carbohydrates, proteins, nucleic acids, and amino acids. True False
False
Ionic bonds usually hold _____________________ compounds together.
inorganic
What is necessary for reactants to combine chemically? input of energy release of energy must satisfy a reversible reaction equilibrium
input of energy
Identify the substance. cholesterol carbohydrate lipid nucleic acid protein
lipid
Catalysts and enzymes are known to __________________ a chemical reaction, but not be consumed in the reaction.
speed up
Complete the energy maximum electron capacity for each energy level. Energy Level 1 maximum electron capacity is 821832. Energy Level 2 maximum electron capacity is 218832. Energy Level 3 maximum electron capacity is 321882. Energy Level 4 maximum electron capacity is 321828. SUBMIT ANSWER
2 8 18 32
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 may consist of two similar elements chemically bonded
The decomposition reaction is: A + B AB none of the above AB + CD AD + BC AB A + B
AB ------>A + B
A hydrogen bond is completed by the transfer of its sole electron to another element. True False
False
All the subatomic particles participate in chemical reactions. True False
False
When a substance dissociates into OH- ions, they are classified as ___________.
bases
Identify the substance. sugar protein lipid carbohydrate nucleic acid
carbohydrate
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
Identify the substance. hemoglobin nucleic acid lipid carbohydrate protein
protein
Antibodies, certain hormones, and hemoglobin are all: fats proteins polysaccharides sucrose
proteins
Starch is made up of: polymer for nucleic acids simple proteins units of C 6H 12O 6 amino acid polymers
units of C 6H 12O 6
When salts are dissolved in water: the components separate into ions they precipitate as compounds they separate into component atoms they form acids and/ or bases
the components separate into ions
A chemical reaction in your body in which bonds are broken is associated with: the storing of energy forming a giant molecule synthesis reaction the release of energy
the release of energy
An atom that has twelve protons in its nucleus has an atomic number of: 24 13 12 none of the above
12
_____ help the cell membrane to conserve internal fluids. Phospholipids Nucleic acids Fats Proteins
Phospholipids
Which statement correctly relates to DNA and RNA? RNA reads and translates the DNA code DNA synthesizes proteins DNA reads and translates the RNA code RNA contains the genetic code
RNA reads and translates the DNA code
Carbon is ideally suited to form covalent bonds. True False
True
Organic compounds form polymers. True False
True
Organic compounds usually contain many atoms. True False
True
When fats decompose in an organism, energy is released. True 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
Why can carbon bond to many elements simultaneously? because its +4 valence forms ionic bonds because it has a natural ionic charge of "+4" because it is capable of forming multiple covalent bonds
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
Starch being broken down into sugar in the body is a(n)_____________ reaction. decomposition reversible synthesis exchange
decomposition
The breakdown of a polysaccharide into monosaccharides is an example of _____. exchange reversible decomposition synthesis
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
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 lipid protein carbohydrate nucleic acid
nucleic acid
In bonding of any type, the _____________ level electrons are involved.
outer
In the process of ionic bonding: the resulting molecule is always charged the resulting ions repel each other outer energy level electrons are shared outer energy level electrons are gained and lost
outer energy level electrons are gained and lost
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
