Trivia On Organic Chemistry: MCQ Quiz!
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Questions and Answers
- 1.
All organic compounds contain:
- A.
Nitrogen
- B.
Sulfur
- C.
Phosphorus
- D.
Carbon
Correct Answer
D. CarbonExplanation
Carbon is found in all organic compounds. Organic compounds are defined as compounds that contain carbon atoms bonded to hydrogen atoms, and may also contain other elements such as oxygen, nitrogen, sulfur, or phosphorus. However, the presence of carbon is a fundamental characteristic of organic compounds, distinguishing them from inorganic compounds which do not contain carbon. Therefore, it can be concluded that all organic compounds contain carbon.Rate this question:
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- 2.
Which of the following are the most abundant elements found in organisms?
- A.
C,P,N,S
- B.
C,O,P,S
- C.
C,O,H,N
- D.
H,N,S,P
Correct Answer
C. C,O,H,NExplanation
The most abundant elements found in organisms are carbon (C), oxygen (O), hydrogen (H), and nitrogen (N). These elements are essential for the structure and functioning of biological molecules such as carbohydrates, lipids, proteins, and nucleic acids. Carbon is the backbone of organic compounds, while oxygen and hydrogen are important for energy production and water molecules. Nitrogen is crucial for building proteins and nucleic acids, which are involved in various cellular processes. Therefore, C, O, H, and N are the most abundant elements in organisms.Rate this question:
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- 3.
Which of the following is not true about carbon?
- A.
It forms 4 bonds
- B.
It has 6 vanelce electrons
- C.
It forms single, double, and triple bonds
- D.
It has 4 valence electrons
Correct Answer
B. It has 6 vanelce electrons -
- 4.
A macromolecule is also known as a?
- A.
Monosaccharide
- B.
Polymer
- C.
Monomer
- D.
Fatty acid
Correct Answer
B. PolymerExplanation
A macromolecule refers to a large molecule made up of smaller units called monomers. These monomers join together through chemical bonds to form a polymer. Therefore, a macromolecule is commonly known as a polymer. Monosaccharides are simple sugars and do not fit the definition of a macromolecule. Similarly, a monomer is a single unit that can join together to form a polymer, so it is not the same as a macromolecule. Fatty acids are a type of molecule but not specifically classified as macromolecules.Rate this question:
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- 5.
The following is ranked in order from smallest to largest:
- A.
Water molecule, carbon atom, monomer, polymer
- B.
Monomer, polymer, water molecule, carbon atom
- C.
Carbon atom, water molecule, monomer, polymer
- D.
Polymer, carbon atom, water molecule, monomer
Correct Answer
C. Carbon atom, water molecule, monomer, polymerExplanation
The correct answer is carbon atom, water molecule, monomer, polymer. This is because a carbon atom is the smallest unit among the options given, followed by a water molecule which consists of two hydrogen atoms and one oxygen atom. A monomer is a single unit that can combine with other monomers to form a polymer, which is a larger molecule made up of repeating subunits. Therefore, the order from smallest to largest is carbon atom, water molecule, monomer, and polymer.Rate this question:
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- 6.
Which of the following is not the main type of organic compound found in organisms?
- A.
Lipid
- B.
Carbohydrates
- C.
Salt
- D.
Protein
Correct Answer
C. SaltExplanation
Salt is not considered a main type of organic compound found in organisms. Organic compounds are composed primarily of carbon atoms bonded to hydrogen atoms, while salt (such as sodium chloride) is an inorganic compound composed of ions. Organic compounds found in organisms include lipids, carbohydrates, and proteins, which play essential roles in various biological processes.Rate this question:
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- 7.
Which group of organic compounds contains sugars and starches?
- A.
Carbohydrate
- B.
Salts
- C.
Nucleic acids
- D.
Lipid
Correct Answer
A. CarbohydrateExplanation
Carbohydrates are the group of organic compounds that contain sugars and starches. They are the main source of energy for the body and play a crucial role in various biological processes. Carbohydrates are composed of carbon, hydrogen, and oxygen atoms, and they can be classified into simple sugars (monosaccharides), complex sugars (disaccharides and polysaccharides), and starches. They are found in various foods such as fruits, vegetables, grains, and dairy products.Rate this question:
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- 8.
Which of the following elements is not found in carbohydrates?
- A.
Oxygen
- B.
Hydrogen
- C.
Carbon
- D.
Sulfur
Correct Answer
D. SulfurExplanation
Carbohydrates are organic compounds made up of carbon, hydrogen, and oxygen atoms. Sulfur is not typically found in carbohydrates. It is more commonly found in amino acids, proteins, and some vitamins. Therefore, sulfur is the element that is not found in carbohydrates.Rate this question:
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- 9.
Which of the following is not a monosaccharide?
- A.
Galactose
- B.
Glucose
- C.
Sucrose
- D.
Frutose
Correct Answer
C. SucroseExplanation
Sucrose is not a monosaccharide because it is a disaccharide composed of glucose and fructose molecules. Monosaccharides are the simplest form of carbohydrates and cannot be broken down into smaller sugar units. Galactose, glucose, and fructose are all monosaccharides because they consist of a single sugar unit.Rate this question:
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- 10.
Monosaccharide means
- A.
Very fat
- B.
Single sugar
- C.
Many sugars
- D.
Very caloric
Correct Answer
B. Single sugarExplanation
Monosaccharide refers to a single sugar molecule. It is the simplest form of carbohydrate and cannot be broken down further into smaller sugars. Monosaccharides are the building blocks of more complex carbohydrates like disaccharides and polysaccharides. Examples of monosaccharides include glucose, fructose, and galactose.Rate this question:
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- 11.
When 2 momnosaccharides join through dehydration synthesis, what happens?
- A.
Energy is lost
- B.
It is stored as fat
- C.
A disaccharide forms and water forms
- D.
A disaccharide forms but water is needed for it to happen
Correct Answer
C. A disaccharide forms and water formsExplanation
When two monosaccharides join through dehydration synthesis, a disaccharide forms and water is also formed. Dehydration synthesis is a chemical reaction where water is removed, resulting in the formation of a larger molecule. In this case, the two monosaccharides combine to form a disaccharide, such as sucrose or lactose, and a molecule of water is released as a byproduct of the reaction. This process is important for the formation of complex carbohydrates in living organisms.Rate this question:
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- 12.
All of the following are polysaccharides except?
- A.
Maltose
- B.
Starch
- C.
Cellulose
- D.
Glycogen
Correct Answer
A. MaltoseExplanation
Maltose is a disaccharide, not a polysaccharide. Polysaccharides are complex carbohydrates composed of multiple sugar units, while maltose is made up of only two glucose molecules. Starch, cellulose, and glycogen are examples of polysaccharides as they consist of long chains of glucose molecules.Rate this question:
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- 13.
Which of the following is not a role of lipids?
- A.
Used as chemical messengers
- B.
Transmit genetic information
- C.
Form barriers
- D.
Store energy
Correct Answer
B. Transmit genetic informationExplanation
Lipids are not involved in transmitting genetic information. Genetic information is typically transmitted through nucleic acids such as DNA and RNA. Lipids, on the other hand, have various roles such as serving as a source of energy, forming cell membranes and barriers, and acting as chemical messengers in signaling pathways.Rate this question:
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- 14.
Waxes, fats, oils, and steroids are all:
- A.
Nucleic acids
- B.
Inorganic
- C.
Lipids
- D.
Carbohydrates
Correct Answer
C. LipidsExplanation
Waxes, fats, oils, and steroids are all lipids. Lipids are a class of organic compounds that are insoluble in water but soluble in organic solvents. They are characterized by their hydrophobic nature and are important for various biological functions. Waxes, fats, oils, and steroids are all examples of lipids, each with their own unique structure and function in living organisms.Rate this question:
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- 15.
Which of the following is true about saturated fats?
- A.
They contain the maximum number of hydrogens
- B.
They are commonly found in plants
- C.
They are considered to be "good" fat for your diet
- D.
They conatain several double bonds between carbons
Correct Answer
A. They contain the maximum number of hydrogensExplanation
Saturated fats contain the maximum number of hydrogens. This means that each carbon atom in the fatty acid chain is bonded to as many hydrogen atoms as possible. This results in a straight and rigid structure, making saturated fats solid at room temperature. Examples of foods high in saturated fats include butter, lard, and fatty cuts of meat. Consuming excessive amounts of saturated fats is linked to an increased risk of heart disease and high cholesterol levels.Rate this question:
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- 16.
The monomers that make up a lipid are?
- A.
Amino acids
- B.
Nucleotides
- C.
Monosaccharides
- D.
3 fatty acids and a glycerold
Correct Answer
D. 3 fatty acids and a glyceroldExplanation
Lipids are a diverse group of biomolecules that include fats, oils, and waxes. They are composed of two main components: fatty acids and a glycerol molecule. Fatty acids are long hydrocarbon chains with a carboxyl group at one end, while glycerol is a three-carbon alcohol. The combination of three fatty acids and a glycerol molecule forms a triglyceride, the most common type of lipid. This arrangement allows lipids to store energy efficiently and serve as structural components of cell membranes. Lipids do not contain amino acids, nucleotides, or monosaccharides, which are the building blocks of proteins, nucleic acids, and carbohydrates, respectively.Rate this question:
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- 17.
Which of the following is different between lipids and carbohydrates?
- A.
Lipids usually have 2 H atoms for every C atom
- B.
Carbohydrates store more energy than lipids and have a higher H to C ratio
- C.
Lipids store more energy than carbohydrates and have a higher H to C ratio
- D.
One contains nitrogen and the other does not
Correct Answer
C. Lipids store more energy than carbohydrates and have a higher H to C ratioExplanation
Lipids and carbohydrates have different properties. Lipids store more energy than carbohydrates, making them a more efficient energy source. Additionally, lipids have a higher hydrogen to carbon (H:C) ratio compared to carbohydrates. This means that there are more hydrogen atoms relative to carbon atoms in lipids. This difference in energy storage and H:C ratio distinguishes lipids from carbohydrates.Rate this question:
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- 18.
Proteins contain which element that is not found in lipids or carbohydrates?
- A.
Oxygen
- B.
Nitrogen
- C.
Carbon
- D.
Hydrogen
Correct Answer
B. NitrogenExplanation
Proteins contain nitrogen, which is not found in lipids or carbohydrates. Nitrogen is an essential element for the structure and function of proteins, as it is present in the amino acids that make up proteins. Lipids and carbohydrates primarily consist of carbon, hydrogen, and oxygen, but do not contain nitrogen.Rate this question:
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- 19.
The main components of an amino acid are?
- A.
A sugar, an R group and an amino group
- B.
A nucleotide, 5-carbon sugar and an amino group
- C.
An amino group, an R group, and a carboxyl group
- D.
A 5-carbon sugar, and R group and hydrocarbon chain
Correct Answer
C. An amino group, an R group, and a carboxyl groupExplanation
The main components of an amino acid are an amino group, an R group, and a carboxyl group. The amino group consists of a nitrogen atom bonded to two hydrogen atoms, the R group is a variable side chain that gives each amino acid its unique properties, and the carboxyl group is a carbon atom double bonded to an oxygen atom and single bonded to a hydroxyl group. These components are essential for the structure and function of amino acids, which are the building blocks of proteins.Rate this question:
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- 20.
How many amino acids are found in nature?
- A.
1000
- B.
20
- C.
10
- D.
Millions
Correct Answer
B. 20Explanation
There are 20 amino acids found in nature. Amino acids are the building blocks of proteins and are essential for various biological processes. These 20 amino acids differ in their chemical structures and properties, allowing them to contribute to the diverse functions of proteins. While there are other amino acids that can be synthesized or modified in the laboratory, the 20 amino acids commonly found in nature are the ones that are naturally occurring and are involved in the synthesis of proteins in living organisms.Rate this question:
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- 21.
Which type of proteins helps speed up chemical reactions?
- A.
Triglycerides
- B.
Enzymes
- C.
Glucose
- D.
Muscles
Correct Answer
B. EnzymesExplanation
Enzymes are proteins that act as catalysts in chemical reactions, speeding up the rate of the reaction without being consumed in the process. They lower the activation energy required for the reaction to occur, allowing it to happen more quickly. Triglycerides are a type of fat molecule, glucose is a type of sugar, and muscles are made up of proteins, but none of these directly facilitate or speed up chemical reactions like enzymes do.Rate this question:
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- 22.
What type of bond holds two amino acids together?
- A.
Ionic
- B.
Hydrogen
- C.
Peptide
- D.
Cohesion
Correct Answer
A. IonicExplanation
Ionic bonds are formed between two atoms when one atom gives away an electron to another atom. In the case of amino acids, the bond that holds two amino acids together is a peptide bond. A peptide bond is a type of covalent bond that forms between the carboxyl group of one amino acid and the amino group of another amino acid. This bond is formed through a condensation reaction, resulting in the formation of a peptide chain. Therefore, the correct answer is peptide, not ionic.Rate this question:
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- 23.
What is another name for a protein made of many amino acids?
- A.
Monopeptide
- B.
Tripeptide
- C.
Dipeptide
- D.
Polypeptide
Correct Answer
D. PolypeptideExplanation
A polypeptide is another name for a protein made of many amino acids. Proteins are formed by the bonding of amino acids through peptide bonds. A polypeptide chain consists of multiple amino acids joined together, forming a long chain. This chain then folds into a specific shape to create a functional protein. Therefore, the correct answer is polypeptide.Rate this question:
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- 24.
Which element is found in nucleic acids but not proteins or lipids?
- A.
Hydrogen
- B.
Phosphorus
- C.
Nitrogen
- D.
Carbon
Correct Answer
B. PhosphorusExplanation
Phosphorus is found in nucleic acids (DNA and RNA) as a key component of the phosphate groups in the backbone of the nucleic acid molecules. Proteins and lipids do not contain phosphorus in their structure. Hydrogen, nitrogen, and carbon are found in all three biomolecules - nucleic acids, proteins, and lipids.Rate this question:
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- 25.
What are the two examples of nucleic acids?
- A.
Cholesterol and phospholipids
- B.
Lactase and sucrase
- C.
DNA and RNA
- D.
Lactose and sucrose
Correct Answer
C. DNA and RNAExplanation
DNA and RNA are examples of nucleic acids. Nucleic acids are macromolecules that are involved in the storage, transmission, and expression of genetic information. DNA (deoxyribonucleic acid) is the genetic material that carries the instructions for the development and functioning of all living organisms. It is responsible for the inheritance of traits from one generation to another. RNA (ribonucleic acid) is involved in the synthesis of proteins based on the instructions provided by DNA. It plays a crucial role in gene expression and protein synthesis. Therefore, DNA and RNA are the correct examples of nucleic acids.Rate this question:
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- 26.
What are the monomers that make up nucleic acids?
- A.
Fatty acids
- B.
Nucleotides
- C.
Amino acids
- D.
Monosaccharides
Correct Answer
B. NucleotidesExplanation
Nucleic acids are composed of monomers called nucleotides. Nucleotides consist of three components: a sugar molecule (either ribose or deoxyribose), a phosphate group, and a nitrogenous base (adenine, guanine, cytosine, thymine, or uracil). These nucleotides join together through phosphodiester bonds to form the backbone of DNA or RNA molecules. Therefore, nucleotides are the correct answer as they are the building blocks of nucleic acids.Rate this question:
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- 27.
Which of the following can store energy or provide structural support in organisms?
- A.
Carbohydrates
- B.
Proteins
- C.
Nucleic acids
- D.
Lipids
Correct Answer
A. CarbohydratesExplanation
Carbohydrates can store energy in the form of glucose, which is used by cells to produce ATP, the main energy currency of the cell. Additionally, carbohydrates can provide structural support in organisms by forming complex structures such as cellulose in plant cell walls and chitin in the exoskeleton of insects. Proteins also play a role in providing structural support, but they are primarily involved in enzymatic reactions, cell signaling, and transportation of molecules. Nucleic acids are responsible for storing and transmitting genetic information. Lipids, on the other hand, are mainly involved in energy storage and insulation rather than providing structural support.Rate this question:
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- 28.
What are two compounds that contain carbon, but are considered to be inorganic?
- A.
Water and carbon dioxide
- B.
Water and carbon monixide
- C.
Methane and water
- D.
Carbon monoxide and carbon dioxide
Correct Answer
D. Carbon monoxide and carbon dioxideExplanation
Carbon monoxide and carbon dioxide are considered to be inorganic compounds because they do not contain hydrogen atoms bonded to carbon. Inorganic compounds are typically defined as compounds that do not contain carbon-hydrogen (C-H) bonds. Both carbon monoxide (CO) and carbon dioxide (CO2) consist only of carbon and oxygen atoms, without any C-H bonds. On the other hand, methane (CH4) is an organic compound because it contains carbon atoms bonded to hydrogen atoms. Water (H2O) is also considered to be inorganic, as it does not contain carbon atoms at all.Rate this question:
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- 29.
A triglyceride is___________ at room temperature:
- A.
Sugar
- B.
Solid
- C.
Unstable
- D.
Liquid
Correct Answer
B. SolidExplanation
Triglycerides are a type of fat molecule composed of three fatty acids attached to a glycerol backbone. At room temperature, most triglycerides are solid due to their high melting points. This is because they contain saturated fatty acids, which have straight chains and can pack tightly together. Solid triglycerides are typically found in foods like butter, lard, and coconut oil.Rate this question:
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- 30.
An oil is_____________ at room temperature:
- A.
Liquid
- B.
Solid
- C.
Unstable
- D.
Sugar
Correct Answer
A. LiquidExplanation
Oil is typically in a liquid state at room temperature. It does not solidify like some fats or become unstable. Additionally, sugar is not related to the state of oil at room temperature.Rate this question:
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- 31.
What element characterizes amino acids?
- A.
Hydrogen
- B.
Oxygen
- C.
Nitrogen
- D.
Carbon
Correct Answer
C. NitrogenExplanation
Amino acids are characterized by the presence of nitrogen. Nitrogen is an essential component of amino acids, which are the building blocks of proteins. It is the nitrogen atom that distinguishes amino acids from other organic molecules, as it is responsible for the unique properties and functions of proteins in living organisms.Rate this question:
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- 32.
A peptide bond is?
- A.
Van der waals forces
- B.
Covalent
- C.
Hydrogen bonding
- D.
Ionic
Correct Answer
B. CovalentExplanation
A peptide bond is a covalent bond that forms between the carboxyl group of one amino acid and the amino group of another amino acid in a protein. Covalent bonds involve the sharing of electrons between atoms, which results in a strong and stable bond. In the case of a peptide bond, the carbon and nitrogen atoms involved share electrons, creating a strong bond that holds the amino acids together in a protein chain. Therefore, the correct answer is covalent.Rate this question:
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