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WorksheetsChapter 9 Test
Total questions: 39
Worksheet time: 20mins
What is the primary source of energy for most plants and animals?
Water
The sun
Oxygen
Carbon dioxide
What is the equation for photosynthesis?
C6H12O6 + 6O2 → 6H2O + 6CO2 + Energy
6H2O + 6CO2 + Energy → C6H12O6 + 6O2
6O2 + Energy → C6H12O6 + 6H2O
6CO2 + Energy + 6O2 → C6H12O6
Which molecules help cells function efficiently?
Enzymes and vitamins
Proteins and carbohydrates
Oxygen and carbon dioxide
Fats and water
Which vitamin must be replaced daily because it dissolves in water?
Vitamin A
Vitamin D
Vitamin C
Vitamin K
During cellular respiration, glucose reacts with:
Carbon dioxide
Oxygen
Water
Light energy
What is a polymer?
A small molecule that links to form large structures
A large molecule made of repeating units
A type of natural fiber
A single atom
What type of bond links monomers together in a polymer?
Ionic
Metallic
Covalent
Hydrogen
Which of the following is a synthetic polymer?
Starch
Nylon
Cellulose
Protein
What are the building blocks of proteins?
Monosaccharides
Nucleotides
Amino acids
Fatty acids
What natural polymer is found in plant cell walls and provides structural support?
Starch
Cellulose
Protein
Nylon
What is the primary function of nucleic acids?
Providing structural support
Storing genetic information
Acting as enzymes
Providing energy
Which of the following synthetic polymers was created as an alternative to silk?
Rubber
Polyethylene
Nylon
Starch
The structure of DNA is best described as a:
Single strand
Helix
Double helix
Flat sheet
What is the name of the process where ethene (ethylene) molecules link together to form polyethylene?
Hydrogenation
Polymerization
Oxidation
Hydrolysis
Which of the following natural polymers is classified as a carbohydrate?
DNA
Starch
Protein
Nylon
A hydrocarbon contains only:
Carbon and hydrogen
Carbon and nitrogen
Carbon and oxygen
Carbon and sulfur
A saturated hydrocarbon contains the maximum possible number of:
Carbon atoms
Hydrogen atoms
Oxygen atoms
Nitrogen atoms
Compounds with the same molecular formula but different structures are called:
Isotopes
Isomers
Ions
Polymers
The three types of unsaturated hydrocarbons are alkenes, alkynes, and:
Ketones
Aromatic hydrocarbons
Aldehydes
Alcohols
The three main fossil fuels are coal, natural gas, and:
Water
Petroleum
Methane
Ethanol
The primary products of complete combustion of fossil fuels are carbon dioxide and:
Methane
Water
Oxygen
Hydrogen
Incomplete combustion produces:
Carbon monoxide
Carbon dioxide
Water
Oxygen
Sulfur dioxide and nitrogen oxides contribute to:
Global warming
Acid rain
Greenhouse effect
Ozone depletion
Which is the hardest form of carbon?
Graphite
Diamond
Fullerenes
Charcoal
Carbon atoms in graphite form strong bonds in:
Chains
Sheets
Rings
Cubes
The simplest hydrocarbon is:
Ethane
Methane
Propane
Butane
Alkanes are also called:
Unsaturated hydrocarbons
Saturated hydrocarbons
Aromatic hydrocarbons
Alcohols
The molecular formula for ethene is:
C2H4
C2H6
C2H2
C3H8
The triple bond in ethyne is characteristic of:
Alkenes
Alkynes
Alkanes
Aromatic hydrocarbons
Aromatic hydrocarbons are known for their:
Sweet taste
Strong aroma
High boiling points
Colorful appearance
Explain the importance of carbon in organic molecules.
Carbon is not present in organic molecules.
Carbon provides energy to organic molecules.
Carbon forms the backbone of organic molecules.
Carbon is only found in inorganic molecules.
What is the difference between DNA and RNA?
DNA is double-stranded, while RNA is single-stranded.
DNA contains uracil, while RNA contains thymine.
DNA is found only in the cytoplasm, while RNA is in the nucleus.
DNA is a protein, while RNA is a carbohydrate.
How does photosynthesis contribute to the carbon cycle?
It releases carbon dioxide into the atmosphere.
It converts carbon dioxide into oxygen.
It converts carbon dioxide into glucose.
It removes oxygen from the atmosphere.
What is the main function of carbohydrates in living organisms?
To store genetic information.
To provide structural support.
To store and provide energy.
To catalyze chemical reactions.
How do proteins contribute to cell structure and function?
They store energy.
They provide genetic information.
They act as enzymes and structural components.
They transport oxygen in the blood.
Why are lipids important for energy storage?
They are easily broken down for quick energy.
They provide long-term energy storage.
They are the primary source of genetic material.
They are not important for energy storage.
What is an isomer? Provide an example.
Molecules with the same formula but different structures.
Molecules with different formulas and structures.
Molecules that are identical in every way.
Molecules that do not exist in nature.
How do fossil fuels impact the environment?
They have no impact on the environment.
They reduce carbon emissions.
They contribute to air pollution and climate change.
They are a renewable energy source.
Describe the process of polymerization and provide an example.
The breakdown of polymers into monomers.
The formation of polymers from monomers.
The conversion of polymers into energy.
The destruction of polymers in the environment.
