Biochemistry Pre-test

Multiple Choice

Which subatomic particle is not in the nucleus?

• proton

• neutron

• electron

Multiple Choice

Which is not a particle in an atom?

• electron

• megatron

• proton

• neutron

Multiple Choice

The amino acid tryptophan has a chemical formula of C₁₁H₁₂N₂O₂. Which element isn't present in this molecule?

• hydrogen

• calcium

• oxygen

• nitrogen

Multiple Choice

Which is a Carbohydrate's monomer?

• Sugar
• Amino acids
• Monosacharide
• Nucleotide

Multiple Choice

Which two bio molecules have only Carbon, Hydrogen, and Oxygen?

• Carbs/Nucleic Acids
• Lipids/Carbs
• Proteins/Nucleic Acids
• Carbs/Proteins

Multiple Choice

A type of biological molecule that includes fats, oils, hormones, waxes, and components of cellular membranes ...

• lipids
• proteins
• carbohydrates
• nucleic acids

Multiple Choice

Glucose is an example of a

• Carbohydrate
• Lipid
• Protein
• Nucleic Acid

Multiple Choice

What is the purpose of an enzyme?

• give permission for the reaction

• raise activation energy

• speed up reactions

• control how many reactions occur

Multiple Choice

What happens when enzymes are heated to a high temperature?

• The enzymes die.
• The shapes of the enzyme are altered or denatured
• The enzymes' amino acid sequence changes.
• The enzymes remain the same

Multiple Choice

Based on the graph, what temperature does this enzyme work best? 

• 15 C
• 40 C
• 30 C
• 47 C

Multiple Choice

Most enzymes are composed of .....

• Lipids

• Carbohydrates

• Proteins

• Nucleic Acids

Multiple Choice

Where do substrates bind on an enzyme?

• voltage-gated channels
• surface receptor
• calcium channels
• active site

Multiple Choice

What type of bond is formed when atoms share electrons?

• Covalent bond

• Ionic bond

• Hydrogen bond

• van der Waals force

Multiple Choice

Imagine you're a scientist working on a new experiment. What would you call the energy needed to kickstart your chemical reaction?

• Activation energy

• Enzyme

• Catalyst

• Substrate

Multiple Choice

What is the starting material in a chemical reaction called?

• Reactant

• Product

• Activation energy

• Catalyst

Multiple Choice

Imagine you are in a chemistry lab. You observe a reaction where electrons are transferred from one atom to another. What type of bond is being formed in this scenario?

• Ionic bond

• Covalent bond

• Hydrogen bond

• van der Waals force

Multiple Choice

Imagine you are a scientist studying substances. How would you define an element in your research?

• A substance that cannot be broken down into simpler substances by chemical means

• A substance composed of two or more different elements chemically combined

• Atoms of the same element that have different numbers of neutrons

• Substances formed as a result of a chemical reaction

Multiple Choice

What are substances that release hydrogen ions (H+) in water called?

• Acids

• Bases

• pH

• Buffers

Multiple Choice

You are making a cup of tea. You add sugar and stir until it completely dissolves. What would you call this type of homogeneous mixture where sugar (one substance) is dissolved in tea (another substance)?

• Solution

• Mixture

• Solute

• Solvent

Multiple Choice

Which statement best describes the graph shown?

• Reaction B occurs at a slower rate.
• The original reaction is catalyzed.
• Less energy is needed to start reaction B.
• More energy is released by the original reaction.

Multiple Choice

Acetylcholine is an important chemical signal in the nervous system. It is  broken down into other chemicals by cholinesterase.Cholinesterase is which of the following?

• enzyme
• hormone
• lipid
• organelle

Multiple Choice

The specific reactants that an enzyme acts on are called

• catalysts
• substrates
• proteins
• amino acids

Multiple Choice

Which phrase best describes an exothermic chemical reaction?

• releases more energy than it absorbs
• forms products with higher bond energy than reactants
• does not absorb any energy
• is in a state of equilibrium

Multiple Choice

DNA and RNA are two types of

• proteins
• lipids
• carbohydrates
• nucleic acids

Multiple Choice

An altered form of the protein collagen causes a condition where bones break easily. Which of the following are components of collagen?

• fatty acids
• amino acids
• nucleic acids
• monosaccharides

Multiple Choice

Fats, oils, and cholesterol are all types of

• fatty acids
• lipids
• hormones
• cell membranes

Multiple Choice

Which category of carbon-based molecules includes sugars and starches?

• proteins
• carbohydrates
• unsaturated fatty acids
• phospholipids

Multiple Choice

Carbon is unique due to the carbon atom’s

• hydrogen bonding strength
• ionic compounds
• six outer unpaired electrons
• bonding properties

Multiple Choice

In the lock-and-key model of enzyme function shown in the figure, what is happening in step 2?

• The active sites are restructuring the enzyme
• The substrates are beginning to bind to the enzyme
• The catalyzed reaction is releasing a product.
• The enzyme is causing new bonds to form between the substrates.

Multiple Choice

Which aspect of a chemical reaction is affected by enzymes?

• rate
• direction
• pH
• equilibrium

Multiple Choice

The activation energy needed for a chemical reaction is decreased by a

• reactant
• product
• catalyst
• substrate

Multiple Choice

Chemical reactions that absorb more energy than they release are called

• exothermic
• catalyzed
• endothermic
• activated

Multiple Choice

Identify the products in this reaction: 6H₂O + 6CO₂ →  C₆H₁₂O₆+ 6O₂.

• 6H₂O and 6CO₂
• 6CO₂ and C₆H₁₂O₆
• 6H₂O, C₆H₁₂O₆, and 6O₂
• C₆H₁₂O₆ and 6O₂

Multiple Choice

Substances are changed into different substances when bonds break and form during

• ion formation
• chemical equilibrium.
• chemical reactions
• hydrogen bonding

Multiple Choice

What elements are common to all 4 biomolecules?

• Carbon, hydrogen, nitrogen
• Carbon, Nitrogen, Phosphorus
• Carbon, Hydrogen, Oxygen
• Carbon, Hydrogen, Phosphorus

Multiple Choice

Which biomolecule is this a picture of?

• Protein
• Nucleic Acid
• Lipid
• Carbohydrate

Multiple Choice

Which biomolecule is this a picture of?

• Protein
• Nucleic Acid
• Lipid
• Carbohydrate

Multiple Choice

Which biomolecule is this a picture of?

• Protein
• Nucleic Acid
• Lipid
• Carbohydrate

Multiple Choice

Carbon, Hydrogen, Oxygen and Nitrogen are elements in what biomolecule?

• Carbohydrate
• Lipid
• Protein
• Nucleic acid

Multiple Choice

What is the monomer of a Lipid?

• Amino Acid
• Nucleotide
• Glycerol and Fatty Acids
• Monosaccharide

Multiple Choice

What is the monomer of a protein?

• Amino acid
• Nucleotide
• Monosaccharide
• Fatty acid

Multiple Choice

What is the monomer of a nucleic acid?

• Nucleotide
• Amino Acid
• Polysaccharide
• Lipid

Multiple Choice

What is the monomer of a carbohydrate?

• Amino Acid
• Nucleotide
• Monosaccharide
• Fatty Acid

Multiple Choice

What elements are in a nucleic acid?

• CHO

• CHOP

• CHONP

• CHON

Multiple Choice

What elements are in a protein?

• CHO

• CHOP

• CHON

• CHONP

Multiple Choice

What elements are in a Lipid

• Carbon, Hydrogen, Oxygen, Nitrogen
• Carbon, Hydrogen, Oxygen
• Carbon, Hydrogen, Oxygen, Phosphorus
• Carbon, Hydrogen, Oxygen, Sulfur

Multiple Choice

What elements are in a carbohydrate

• CHO

• CHON

• CHOP

• CHONP

Multiple Choice

Bases release which ions ?

• hydroxide ions

• no ions

• hydrogen ions

• hydroxide and hydrogen ions

Multiple Choice

Attractions between water molecules are called

• Covalent bonds
• Ionic bonds
• Polar bonds
• Hydrogen bonds

Multiple Choice

The process of removing water in order to form a bond between monomers is called....

• Dehydration Synthesis
• Hydrolysis