Super Fun Biochemistry Exam!

Reviewed by Editorial Team
The ProProfs editorial team is comprised of experienced subject matter experts. They've collectively created over 10,000 quizzes and lessons, serving over 100 million users. Our team includes in-house content moderators and subject matter experts, as well as a global network of rigorously trained contributors. All adhere to our comprehensive editorial guidelines, ensuring the delivery of high-quality content.
Learn about Our Editorial Process
| By Kris_french
K
Kris_french
Community Contributor
Quizzes Created: 1 | Total Attempts: 1,858
| Attempts: 1,870
Quiz Flashcard
SettingsSettings
Please wait...
  • 1/20 Questions

    Which of the following could cause denaturation of an enzyme?

    • Substrate concentration
    • A competitive inhibitor
    • High temperature
    • Low salt concentration
Please wait...
About This Quiz


Are you a biochemistry student who is struggling to understand the subject? Why not give this super fun biochemistry exam a try? You can strengthen your fundamentals of biochemistry by playing this quiz. Interestingly, it can also be crucial in your examination preparations. All the questions asked are designed to test your knowledge and make you think outside the box! Now, that's interesting, isn't it? Please make sure to read all the questions carefully before attempting. We wish you all the very best!

Super Fun Biochemistry Exam! - Quiz

Quiz Preview

  • 2. 
    Which molecule represents ribose? - ProProfs

    Which molecule represents ribose?

    • A

    • B

    • C

    • D

    Correct Answer
    A. D
    Explanation
    Ribose is a type of sugar molecule that is found in RNA (ribonucleic acid). It is a pentose sugar, meaning it has five carbon atoms. Among the given options, molecule D represents ribose as it has five carbon atoms and the correct chemical structure for ribose.

    Rate this question:

  • 3. 

    Which of the following reactions occurs when a dipeptide is formed from amino acids?

    • Hydrolysis

    • Denaturation

    • Condensation

    • Oxidation

    Correct Answer
    A. Condensation
    Explanation
    When a dipeptide is formed from amino acids, the reaction that occurs is condensation. Condensation is a chemical reaction in which two molecules combine to form a larger molecule, with the simultaneous release of a small molecule such as water. In the case of dipeptide formation, two amino acids combine, and a water molecule is released as a byproduct. This reaction is also known as dehydration synthesis. Hydrolysis, denaturation, and oxidation are not the correct answers because they do not describe the specific reaction involved in dipeptide formation.

    Rate this question:

  • 4. 
    Which structure represents an amino acid? - ProProfs

    Which structure represents an amino acid?

    • A

    • B

    • C

    • D

    Correct Answer
    A. D
    Explanation
    Structure D represents an amino acid because it consists of an amino group (NH2), a carboxyl group (COOH), and a side chain (R group) attached to a central carbon atom. This structure is characteristic of amino acids, which are the building blocks of proteins. Structures A, B, and C do not have the necessary components to represent an amino acid.

    Rate this question:

  • 5. 

    What is the composition of the backbone of DNA?

    • Alternating sugar and phosphate molecules

    • Complementary base pairs

    • Alternating sugar and base molecules

    • A polysaccharide

    Correct Answer
    A. Alternating sugar and phosphate molecules
    Explanation
    The backbone of DNA is composed of alternating sugar and phosphate molecules. These molecules are connected by covalent bonds, forming a stable and strong structure. The sugar molecules in the backbone are deoxyribose, and the phosphate molecules are attached to the 5' carbon of one sugar and the 3' carbon of the adjacent sugar. This alternating sugar-phosphate backbone provides stability to the DNA molecule and serves as a platform for the attachment of nucleotide bases, which form the complementary base pairs.

    Rate this question:

  • 6. 

    What is the function of helicase?

    • It forms bonds between DNA nucleotides.

    • It adds new nucleotides to the DNA helix.

    • It forms the DNA helix.

    • It separates DNA strands.

    Correct Answer
    A. It separates DNA strands.
    Explanation
    Helicase is an enzyme responsible for separating the DNA strands during DNA replication. It does this by breaking the hydrogen bonds between the complementary base pairs, allowing the two strands to unwind and separate. This process is essential for DNA replication and other DNA-related processes like transcription and repair. Therefore, the function of helicase is to separate DNA strands.

    Rate this question:

  • 7. 

    Water molecules are described as being dipolar. This means that

    • It has one oxygen atom and two hydrogen atoms

    • It has one hydrogen atom and two oxygen atoms

    • It has negative and positive "ends"

    • It has two negative "ends"

    Correct Answer
    A. It has negative and positive "ends"
    Explanation
    Water molecules are described as being dipolar because they have a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms. This is due to the unequal sharing of electrons between the oxygen and hydrogen atoms in the molecule. The oxygen atom attracts the shared electrons more strongly, creating a negative charge near the oxygen atom and a positive charge near the hydrogen atoms. This polarity allows water molecules to form hydrogen bonds with each other and other polar molecules, giving water its unique properties such as high boiling point and surface tension.

    Rate this question:

  • 8. 

    A certain gene codes for a polypeptide that is 120 amino acids long. Approximately how many nucleotides long is the mRNA that codes for this polypeptide likely to be?

    • 30

    • 40

    • 360

    • 480

    Correct Answer
    A. 360
    Explanation
    The mRNA that codes for a polypeptide is typically longer than the polypeptide itself because each amino acid is coded by a sequence of three nucleotides called a codon. Since the polypeptide is 120 amino acids long, the mRNA is likely to be 120 x 3 = 360 nucleotides long.

    Rate this question:

  • 9. 

    Where do transcription and translation occur in eukaryotic cells?

    • Both in the cytoplasm

    • Transcription in the cytoplasm, translation in the nucleus

    • Transcription in the nucleus, translation in the cytoplasm

    • Both in the nucleus

    Correct Answer
    A. Transcription in the nucleus, translation in the cytoplasm
    Explanation
    Transcription is the process of synthesizing mRNA from DNA, and it occurs in the nucleus of eukaryotic cells. Translation is the process of protein synthesis, where the mRNA is used as a template to assemble amino acids into a protein. Translation occurs in the cytoplasm, specifically on ribosomes. Therefore, the correct answer is that transcription occurs in the nucleus, while translation occurs in the cytoplasm.

    Rate this question:

  • 10. 

    The sugar lactose is composed of?

    • Two glucose molecules

    • One glucose and one sucrose molecule

    • One glucose and one galactose molecule

    • One galactose and one sucrose molecule

    Correct Answer
    A. One glucose and one galactose molecule
    Explanation
    Lactose is a disaccharide sugar composed of one glucose molecule and one galactose molecule. This means that lactose is formed by the condensation reaction between a glucose molecule and a galactose molecule, resulting in the formation of a glycosidic bond.

    Rate this question:

  • 11. 

    Which is not a primary function of protein molecules?

    • Hormones

    • Energy store

    • Transport

    • Structure

    Correct Answer
    A. Energy store
    Explanation
    Protein molecules have various functions in the body, including acting as enzymes, hormones, and transporters, as well as providing structural support. However, storing energy is not a primary function of protein molecules. Carbohydrates and fats are the main sources of energy storage in the body, while proteins are primarily involved in building and repairing tissues, regulating metabolism, and supporting various physiological processes.

    Rate this question:

  • 12. 
    The diagram below shows a channel protein in a membrane. Which parts of the surface of the protein would be composed of polar amino acids. - ProProfs

    The diagram below shows a channel protein in a membrane. Which parts of the surface of the protein would be composed of polar amino acids.

    • I and II only

    • II and III only

    • III and IV only

    • I and IV only

    Correct Answer
    A. I and II only
    Explanation
    The diagram shows a channel protein in a membrane. Polar amino acids are hydrophilic and are attracted to water. In the diagram, regions I and II are exposed to the aqueous environment on either side of the membrane. These regions are likely to be composed of polar amino acids to interact with the water molecules. Regions III and IV, on the other hand, are embedded within the hydrophobic lipid bilayer of the membrane and are less likely to contain polar amino acids. Therefore, the correct answer is I and II only.

    Rate this question:

  • 13. 

    Pigments are extracted from the leaves of a green plant. White light is then passed through the solution of pigments. What effect do the leaf pigments have on the white light?

    • Green wavelengths are absorbed and red and blue wavelengths are transmitted.

    • Red and blue wavelengths are absorbed and green wavelengths are transmitted.

    • Blue wavelengths are absorbed and green and red wavelengths are transmitted.

    • Green and red wavelengths are absorbed and blue wavelengths are transmitted.

    Correct Answer
    A. Red and blue wavelengths are absorbed and green wavelengths are transmitted.
    Explanation
    The correct answer is "Red and blue wavelengths are absorbed and green wavelengths are transmitted." This is because pigments in the leaves of a green plant absorb certain wavelengths of light while allowing others to be transmitted. In this case, the pigments in the leaves absorb red and blue wavelengths of light, while green wavelengths are transmitted. This is why we perceive the leaves as green.

    Rate this question:

  • 14. 

    Of the following products, which is produced by both anaerobic respiration and aerobic respiration in humans? I - Pyruvate II - ATP III - Lactate

    • I only

    • I and II only

    • I, II and III

    • II and III only

    Correct Answer
    A. I and II only
    Explanation
    Both pyruvate and ATP are produced by both anaerobic respiration and aerobic respiration in humans. Pyruvate is a product of glycolysis, which occurs during both anaerobic and aerobic respiration. ATP is the main energy currency of the cell and is produced through the electron transport chain in aerobic respiration and through substrate-level phosphorylation in anaerobic respiration. Lactate, on the other hand, is produced only during anaerobic respiration as a byproduct of the conversion of pyruvate.

    Rate this question:

  • 15. 

    Which of the following are connected by a hydrogen bond?

    • The hydrogen and oxygen atoms of a water molecule

    • A base pair of a DNA molecule

    • Two amino acid molecules of a dipeptide

    • Two glucose molecules in a disaccharide

    Correct Answer
    A. A base pair of a DNA molecule
    Explanation
    A base pair of a DNA molecule is connected by a hydrogen bond. In DNA, the bases adenine (A) and thymine (T) are connected by two hydrogen bonds, while the bases guanine (G) and cytosine (C) are connected by three hydrogen bonds. These hydrogen bonds play a crucial role in maintaining the double helix structure of DNA and ensuring the accurate replication and transmission of genetic information.

    Rate this question:

  • 16. 

    One of the roles of nitrogen in living things is:

    • In the production of amino acids

    • In the production of carbohydrates

    • In the production of lipids

    • In all of the above

    Correct Answer
    A. In the production of amino acids
    Explanation
    Nitrogen plays a crucial role in the production of amino acids, which are the building blocks of proteins. Amino acids are essential for various biological processes, including the synthesis of enzymes, hormones, and antibodies. Nitrogen is a key component of the amino acid structure, as it is required to form the amine group (-NH2) present in all amino acids. Therefore, the correct answer is that nitrogen is involved in the production of amino acids.

    Rate this question:

  • 17. 
    The diagram below shows a short section of the DNA molecules before and after replication. If the nucleotides used to replicate the DNA were radioactive, which strands in the replicated molecules would be radioactive? - ProProfs

    The diagram below shows a short section of the DNA molecules before and after replication. If the nucleotides used to replicate the DNA were radioactive, which strands in the replicated molecules would be radioactive?

    • II and III only

    • I and III only

    • I and II only

    • I, II, III and IV

    Correct Answer
    A. II and III only
    Explanation
    During DNA replication, the two strands of the original DNA molecule separate and serve as templates for the synthesis of two new complementary strands. In the diagram, the original DNA molecule is represented by strand I and strand II. After replication, the new strands are formed: strand I' and strand II'. Since the nucleotides used for replication were radioactive, only the newly synthesized strands (strand I' and strand II') would be radioactive. Therefore, the correct answer is II and III only.

    Rate this question:

  • 18. 

    What is the advantage of using pectinase in fruit juice production?

    • The pectin content of the fruit is increased, making the nutritional value of the juice higher.

    • The pectin content of the fruit is reduced, making the energy content of the juice lower.

    • The pectin content of the fruit is reduced, making the juice easier to extract.

    • The pectin content of the fruit is increased, giving the juice a thicker texture.

    Correct Answer
    A. The pectin content of the fruit is reduced, making the juice easier to extract.
    Explanation
    Pectinase is an enzyme that breaks down pectin, a substance found in the cell walls of fruits. By using pectinase in fruit juice production, the pectin content of the fruit is reduced. This reduction in pectin makes the juice easier to extract because pectin can cause the juice to become thick and gel-like. Therefore, using pectinase helps to improve the efficiency of juice extraction, resulting in a smoother and more fluid juice product.

    Rate this question:

  • 19. 

     What is removed to form mature eukaryotic mRNA?

    • RNA primers

    • Exons

    • RNA polymerases

    • Introns

    Correct Answer
    A. Introns
    Explanation
    Introns are removed to form mature eukaryotic mRNA. Introns are non-coding regions of DNA that are transcribed into RNA but are not translated into proteins. They are initially present in the pre-mRNA molecule and need to be removed through a process called splicing. This process involves the removal of introns and joining together of the remaining coding regions called exons. The resulting mRNA molecule contains only the exons and is ready to be translated into a protein.

    Rate this question:

  • 20. 

    What is needed in photosynthesis to convert carbon dioxide into organic molecules?

    • Light and hydrogen from the splitting of water

    • Light and oxygen from the splitting of water

    • ATP and hydrogen from the splitting of water

    • ATP and oxygen from the splitting of water

    Correct Answer
    A. ATP and hydrogen from the splitting of water
    Explanation
    During photosynthesis, carbon dioxide is converted into organic molecules. This process requires ATP, which is a form of energy, and hydrogen from the splitting of water. Light is also needed in photosynthesis, but it is not directly involved in the conversion of carbon dioxide into organic molecules. Oxygen is produced as a byproduct of photosynthesis, but it is not required for the conversion of carbon dioxide.

    Rate this question:

Quiz Review Timeline (Updated): Aug 26, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Aug 26, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 03, 2010
    Quiz Created by
    Kris_french
Back to Top Back to top
Advertisement
×

Wait!
Here's an interesting quiz for you.

We have other quizzes matching your interest.