DNA Replication And Protein Synthesis Review
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Questions and Answers
- 1.
What is produced during transcription?
- A.
MRNA molecule
- B.
DNA molecule
- C.
RNA polymerase
- D.
Proteins
Correct Answer
A. MRNA moleculeExplanation
During transcription, the DNA molecule serves as a template to produce a complementary mRNA molecule. This process occurs in the nucleus of a cell and is catalyzed by an enzyme called RNA polymerase. The mRNA molecule carries the genetic information from the DNA to the ribosomes in the cytoplasm, where it serves as a template for protein synthesis. Therefore, the correct answer is mRNA molecule.Rate this question:
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- 2.
If a base is added to DNA (an addition mutation - frameshift) - what is the likely outcome?
- A.
The organism will be unable to reproduce.
- B.
The change will cause a genetic disease.
- C.
The DNA will be unable to replicate.
- D.
The DNA will change code for the incorrect protein
Correct Answer
D. The DNA will change code for the incorrect proteinExplanation
When a base is added to DNA, it causes a frameshift mutation, which shifts the reading frame of the DNA sequence. This means that the grouping of nucleotides into codons will be altered, leading to a change in the genetic code. As a result, the DNA will code for the incorrect protein, which can have significant effects on the organism's functioning. This can lead to the development of genetic diseases or other abnormalities.Rate this question:
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- 3.
By what process does a cell copy DNA before it divides?
- A.
Replication
- B.
Translation
- C.
Germination
- D.
Transcription
Correct Answer
A. ReplicationExplanation
Replication is the process by which a cell copies its DNA before dividing. During replication, the DNA molecule unwinds and each strand serves as a template for the synthesis of a new complementary strand. This results in two identical copies of the original DNA molecule. Replication is a crucial step in cell division as it ensures that each daughter cell receives an exact copy of the genetic material, allowing for the transmission of genetic information from one generation to the next.Rate this question:
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- 4.
During transcription, an mRNA molecule is formed:
- A.
That is complementary to both strands of DNA.
- B.
That is identical to part of a single strand of DNA.
- C.
That it is double-stranded
- D.
Inside the nucleus.
Correct Answer
D. Inside the nucleus.Explanation
The correct answer is "Inside the nucleus" because transcription is the process by which an mRNA molecule is synthesized using a DNA template. This process takes place in the nucleus of eukaryotic cells, where the DNA is located. The mRNA molecule is formed by complementary base pairing with one of the DNA strands, resulting in a single-stranded molecule that carries the genetic information from the nucleus to the cytoplasm for translation.Rate this question:
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- 5.
What kind of molecules carry the instructions for protein synthesis?
- A.
DNA and RNA
- B.
Amino acids
- C.
Liqids and carbohydrates
- D.
Enzymes
Correct Answer
A. DNA and RNAExplanation
DNA and RNA carry the instructions for protein synthesis. DNA is the genetic material that contains the instructions for the production of proteins, while RNA acts as a messenger molecule that carries these instructions from the DNA to the ribosomes, where protein synthesis occurs. Both DNA and RNA play crucial roles in the process of protein synthesis.Rate this question:
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- 6.
What process is being shown in the diagram?
- A.
Replication
- B.
Translation
- C.
Transcription
- D.
Mutation
Correct Answer
B. TranslationExplanation
The process being shown in the diagram is translation. Translation is the process in which the genetic information carried by mRNA is decoded to produce a specific sequence of amino acids, which then form a protein. This process occurs in the ribosomes and involves the reading of the mRNA codons by transfer RNA (tRNA) molecules, which bring the corresponding amino acids to be added to the growing protein chain.Rate this question:
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- 7.
What happens during the process of translation?
- A.
Messenger RNA is made from DNA.
- B.
TRNA uses information from mRNA to produce amino acid chains (proteins).
- C.
Transfer RNA is made from messenger RNA.
- D.
Copies of DNA molecule are made.
Correct Answer
B. TRNA uses information from mRNA to produce amino acid chains (proteins).Explanation
During the process of translation, tRNA uses the information from mRNA to produce amino acid chains, which ultimately form proteins. This process occurs in the ribosomes, where the tRNA molecules, carrying specific amino acids, bind to the complementary codons on the mRNA strand. As the ribosome moves along the mRNA, the tRNA molecules continue to bring in the corresponding amino acids, which are then linked together to form a polypeptide chain. This chain of amino acids folds and interacts to create a functional protein.Rate this question:
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- 8.
What type of molecule is shown here?
- A.
Carbohydrate
- B.
Nucleic acid
- C.
Protein
- D.
Liqid
Correct Answer
C. ProteinExplanation
The molecule shown here is a protein. Proteins are large, complex molecules that are essential for the structure and function of cells. They are made up of chains of amino acids that are folded into specific three-dimensional shapes. The image might be depicting the structure of a protein molecule, which could include various components such as alpha helices, beta sheets, and other structural motifs.Rate this question:
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- 9.
Which molecule is double-stranded, with each strand held to the other strand by hydrogen bonds?
- A.
DNA molecule.
- B.
Amino acid
- C.
RNA molecule
- D.
Protein
Correct Answer
A. DNA molecule.Explanation
The correct answer is DNA molecule. DNA is a double-stranded molecule, with each strand held to the other strand by hydrogen bonds. The two strands of DNA are complementary and form a double helix structure. This double-stranded nature of DNA allows for the accurate replication and transmission of genetic information. Amino acids are the building blocks of proteins, while RNA molecules are typically single-stranded. Proteins are composed of amino acids and do not have a double-stranded structure like DNA.Rate this question:
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- 10.
DNA is copied during a process called:
- A.
Replication
- B.
Translation
- C.
Transcription
- D.
Transformation
Correct Answer
A. ReplicationExplanation
DNA replication is the process by which a cell makes an identical copy of its DNA. During replication, the two strands of the DNA molecule separate and each strand serves as a template for the synthesis of a new complementary strand. This process ensures that each new cell receives a complete set of genetic information. Transcription, on the other hand, is the process of synthesizing RNA from a DNA template, while translation is the process of synthesizing proteins using the information encoded in mRNA. Transformation refers to the process by which foreign DNA is introduced into a cell.Rate this question:
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- 11.
What are the four nitrogen bases for DNA?
- A.
Uracil, Thymine, Adenine, and Guanine
- B.
Cytosine, Thymine, Adenine, Guanine
- C.
Thymine, Adenine, Lytosine, Guanine
- D.
Thymine, Adenise, Guanine, Cytosol
Correct Answer
B. Cytosine, Thymine, Adenine, GuanineExplanation
The correct answer is Cytosine, Thymine, Adenine, Guanine. These four nitrogen bases are the building blocks of DNA. Cytosine pairs with Guanine, and Thymine pairs with Adenine in the DNA double helix. Uracil is a nitrogen base found in RNA, not DNA. Lytosine and Adenise are not nitrogen bases. Cytosol is a liquid component found in cells, not a nitrogen base.Rate this question:
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- 12.
What is the yellow piece which breaks apart the hydrogen bonds between two strands of DNA?
- A.
An enyzme (helicase)
- B.
MRNA
- C.
TRNA
Correct Answer
A. An enyzme (helicase)Explanation
Helicase is an enzyme that plays a crucial role in DNA replication and transcription. It unwinds the double-stranded DNA molecule by breaking the hydrogen bonds between the base pairs, separating the two strands. This process allows other enzymes and proteins to access the DNA strands for replication or transcription to occur. Therefore, helicase is responsible for breaking apart the hydrogen bonds between two strands of DNA.Rate this question:
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- 13.
In DNA replication which strand grows continuously towards the replication fork?
- A.
Lagging strand
- B.
RNA strand
- C.
Leading strand
- D.
Replicating strand
Correct Answer
C. Leading strandExplanation
During DNA replication, the leading strand is the strand that grows continuously towards the replication fork. The leading strand is synthesized in the 5' to 3' direction, which is the same direction as the movement of the replication fork. This allows the DNA polymerase enzyme to add new nucleotides to the growing strand without interruption. In contrast, the lagging strand is synthesized in short fragments called Okazaki fragments, as it grows away from the replication fork. Therefore, the leading strand is the correct answer.Rate this question:
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- 14.
DNA polymerase III (an enzyme) builds new strands from scratch during DNA replication. True or False?
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
DNA polymerase III does not build new strands from scratch during DNA replication. It is responsible for adding nucleotides to the growing DNA strand, but it requires a primer to initiate the replication process. The primer provides the starting point for DNA polymerase III to add nucleotides and extend the strand. Therefore, the correct answer is False.Rate this question:
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- 15.
The lagging strand is the new strand that grows discontinuously away from the replication fork.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The lagging strand is synthesized in short fragments called Okazaki fragments, which are later joined together to form a continuous strand. This occurs because DNA replication can only proceed in the 5' to 3' direction, and since the lagging strand is oriented in the opposite direction, it must be synthesized in a discontinuous manner. Therefore, the statement that the lagging strand grows discontinuously away from the replication fork is true.Rate this question:
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- 16.
What is the name of the fragments of the lagging strand pictured above?
- A.
Binding proteins
- B.
Fragmenting lagging strand
- C.
Okazaki segments
- D.
Coding strands
Correct Answer
C. Okazaki segmentsExplanation
The fragments of the lagging strand in DNA replication are known as Okazaki segments. These segments are short DNA sequences that are synthesized in the opposite direction of the replication fork. They are formed due to the discontinuous nature of DNA replication on the lagging strand. Okazaki segments are later joined together by DNA ligase to form a continuous lagging strand.Rate this question:
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- 17.
The new DNA strand formed after DNA replication is an exact copy of its parent strand. True of False?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
During DNA replication, the double-stranded DNA molecule unwinds and each strand serves as a template for the synthesis of a new complementary strand. The enzyme DNA polymerase adds nucleotides to the growing new strand, following the base pairing rules (A with T, and C with G). As a result, the new DNA strand is an exact copy of its parent strand, with one strand being the original template and the other being the newly synthesized strand. Therefore, the statement "The new DNA strand formed after DNA replication is an exact copy of its parent strand" is true.Rate this question:
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- 18.
What RNA strand would be produced from the following DNA strand?CCTCATGGC
- A.
GGAGTACCG
- B.
CCTCATGGC
- C.
CCUCAUGGC
- D.
GGAGUACCG
Correct Answer
D. GGAGUACCGExplanation
The RNA strand produced from the given DNA strand would be GGAGUACCG. This is because in RNA, the base Uracil (U) replaces Thymine (T) found in DNA. So, each T in the DNA strand is replaced by U in the RNA strand. The rest of the bases remain the same.Rate this question:
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- 19.
Which molecule picks up amino acids and brings them to the ribosome?
- A.
DNA
- B.
MRNA
- C.
TRNA
Correct Answer
C. TRNAExplanation
tRNA, or transfer RNA, is responsible for picking up amino acids and delivering them to the ribosome during protein synthesis. It carries a specific amino acid at one end and has a corresponding anticodon at the other end, which pairs with the codon on the mRNA molecule. The tRNA molecule acts as a bridge between the mRNA and the amino acids, ensuring that the correct amino acids are added to the growing protein chain in the ribosome.Rate this question:
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- 20.
Where does translation occur?
- A.
In the nucleus of the cell
- B.
Outside the cell
- C.
At the ribosomes in the cytoplasm of the cell
Correct Answer
C. At the ribosomes in the cytoplasm of the cellExplanation
Translation occurs at the ribosomes in the cytoplasm of the cell. Ribosomes are responsible for synthesizing proteins by translating the genetic information carried by messenger RNA (mRNA) molecules. This process involves the assembly of amino acids in the correct order to form a protein chain. The ribosomes are located in the cytoplasm, which is the fluid-filled region of the cell outside the nucleus. Therefore, translation occurs at the ribosomes in the cytoplasm of the cell.Rate this question:
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- 21.
RNA has all of the following EXCEPT:
- A.
Ribose
- B.
Single strand
- C.
Contains uracil
- D.
Deoxyribose
Correct Answer
D. DeoxyriboseExplanation
RNA is a single-stranded molecule that contains ribose sugar and uracil instead of thymine. Deoxyribose, on the other hand, is a sugar molecule found in DNA, not RNA. Therefore, the correct answer is Deoxyribose.Rate this question:
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- 22.
Which of the following is not a nucleic acid?
- A.
Amino acid
- B.
DNA
- C.
RNA
Correct Answer
A. Amino acidExplanation
Amino acid is not a nucleic acid because it is a building block of proteins, not nucleic acids. Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information, while amino acids are involved in protein synthesis.Rate this question:
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- 23.
What is the shape of the DNA called?
- A.
Double spiral
- B.
Circular
- C.
Double helix
- D.
Spiral
Correct Answer
C. Double helixExplanation
The shape of DNA is called a double helix because it consists of two strands that are twisted around each other in a spiral fashion. This structure was discovered by James Watson and Francis Crick in 1953, and it is essential for the replication and transmission of genetic information. The double helix shape allows DNA to be tightly packed into the nucleus of a cell while still being accessible for transcription and translation processes.Rate this question:
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- 24.
Which one is not found in the structure of the DNA?
- A.
Phosphate
- B.
Uracil
- C.
Thymine
Correct Answer
B. UracilExplanation
Uracil is not found in the structure of DNA. DNA is composed of four nucleotides: adenine (A), guanine (G), cytosine (C), and thymine (T). Uracil (U) is found in RNA instead of thymine. This is because during transcription, DNA is transcribed into RNA, and thymine is replaced by uracil. Therefore, uracil is not a component of DNA's structure.Rate this question:
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- 25.
RNA does not leave the nucleus but DNA does
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
This statement is false. In reality, both RNA and DNA can leave the nucleus. RNA is actually synthesized in the nucleus and then transported out into the cytoplasm, where it carries out various functions such as protein synthesis. DNA, on the other hand, remains in the nucleus and serves as the genetic material that is replicated and transcribed into RNA.Rate this question:
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- 26.
DNA is found in the attached to the nucleus.
Correct Answer
NucleusExplanation
DNA is found in the nucleus.Rate this question:
- 27.
What are the building blocks of protein called?
- A.
Polypeptide
- B.
Lipase
- C.
Amino acid
- D.
Enzymes
Correct Answer
C. Amino acidExplanation
Amino acids are the building blocks of proteins. Proteins are made up of long chains of amino acids that are linked together by peptide bonds. Each amino acid has a unique side chain, or R-group, that gives it its specific properties. These amino acids can be combined in different sequences and lengths to form a wide variety of proteins with different structures and functions. Therefore, amino acids are the correct answer as they are the individual units that make up proteins.Rate this question:
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- 28.
Which one is not part of the Nucleus?
- A.
Ribosomes
- B.
Nuclear membrane
- C.
Nucleoplasm
- D.
Nucleolus
- E.
Chromatin network
Correct Answer
A. RibosomesExplanation
Ribosomes are not part of the nucleus. They are small, spherical structures found in the cytoplasm of cells. Ribosomes are responsible for protein synthesis and are involved in translating the genetic information stored in the nucleus into functional proteins. While the nucleus contains the nuclear membrane, nucleoplasm, nucleolus, and chromatin network, ribosomes are located outside of the nucleus in the cytoplasm.Rate this question:
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Mar 19, 2023Quiz Edited by
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May 11, 2017Quiz Created by
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