Biology Exam: MCQ Ultimate Quiz!
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Biology exam: MCQ ultimate quiz! Biology is the study of living things. It helps explain the processes that go on within the living creatures and how they behave in the environment they live in. Do you know how many systems exist in the human body and some of the threats the body faces from the environment. Do take up this quiz and see how much you know about living things.
Questions and Answers
- 1.
Genes make up?
- A.
DNA material
- B.
Protein
- C.
Genetic code
Correct Answer
B. ProteinExplanation
Genes make up proteins. Proteins are large, complex molecules that perform various functions in the body. Genes are segments of DNA that contain the instructions for making proteins. These instructions are transcribed into RNA, which is then translated into proteins. Proteins are essential for the structure, function, and regulation of cells, tissues, and organs in the body. Therefore, the correct answer is protein.Rate this question:
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- 2.
DNA is:
- A.
Is inherit pass on to our offspring
- B.
Transcription and translation of a gene to a protein DNA mutation.
- C.
Genetic material: DNA structure and DNA replication
Correct Answer(s)
A. Is inherit pass on to our offspring
C. Genetic material: DNA structure and DNA replicationExplanation
The correct answer is that DNA is both inheritable and the genetic material responsible for DNA structure and replication. DNA is passed on from parents to offspring through the process of inheritance, ensuring genetic continuity across generations. Additionally, DNA serves as the genetic material in all living organisms, carrying the instructions necessary for the structure and replication of DNA molecules.Rate this question:
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- 3.
Genetic code:
- A.
DNA offspring
- B.
Transcription and translation of a gene to a protein DNA mutation.
- C.
Make protein
Correct Answer
B. Transcription and translation of a gene to a protein DNA mutation.Explanation
The genetic code refers to the process of transcription and translation, where a gene is transcribed from DNA into RNA and then translated into a protein. This process is essential for the expression of genes and the production of proteins, which are the building blocks of life. DNA mutation refers to any changes or alterations in the DNA sequence, which can have various effects on the resulting protein. Therefore, the answer suggests that the genetic code involves both the transcription and translation of a gene to a protein, as well as the possibility of DNA mutations affecting this process.Rate this question:
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- 4.
How many codes are in our genes?
- A.
200,000
- B.
3,200,000, million
- C.
5 million
Correct Answer
B. 3,200,000, millionExplanation
The given answer of "3,200,000, million" suggests that there are 3.2 million codes in our genes. This implies that our genes contain a vast number of codes, which are responsible for various genetic traits and functions.Rate this question:
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- 5.
DNA Polymers are:
- A.
Adenine(A) Cytosine(C) guanine(G) Thymine(T)
- B.
Adenine(A) Cytosine(C) guanine(G) Uracil(U)
Correct Answer
A. Adenine(A) Cytosine(C) guanine(G) Thymine(T)Explanation
DNA polymers are composed of four nucleotides: adenine (A), cytosine (C), guanine (G), and thymine (T). These nucleotides form the building blocks of DNA molecules and are arranged in specific sequences to encode genetic information. The presence of thymine instead of uracil (U) is a characteristic feature of DNA, while RNA contains uracil instead of thymine. Therefore, the correct answer is adenine (A), cytosine (C), guanine (G), and thymine (T).Rate this question:
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- 6.
RNA is:
- A.
Adenine(A) Cytosine(C) guanine(G) Uracil(U)
- B.
Adenine(A) Cytosine(C) guanine(G) Thymine(T)
Correct Answer
A. Adenine(A) Cytosine(C) guanine(G) Uracil(U)Explanation
RNA is a type of nucleic acid that is composed of four different nucleotide bases: adenine (A), cytosine (C), guanine (G), and uracil (U). Unlike DNA, which contains thymine (T) instead of uracil, RNA uses uracil as one of its bases. Therefore, the correct answer is Adenine(A), Cytosine(C), Guanine(G), Uracil(U).Rate this question:
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- 7.
Purines are:
- A.
Have a single ring structure, contains Thymine and Cytosine
- B.
Have double ring structure and have Adenine and Guanine
Correct Answer
B. Have double ring structure and have Adenine and GuanineExplanation
Purines are nucleotide bases that have a double ring structure and consist of Adenine and Guanine. This is the correct answer because purines are indeed characterized by their double ring structure and the presence of Adenine and Guanine. Thymine and Cytosine are pyrimidines, which have a single ring structure and are not part of the purine group.Rate this question:
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- 8.
DNA are Double or Single helix molecules?
- A.
Single
- B.
Double
Correct Answer
B. DoubleExplanation
DNA molecules are double helix structures. This means that they consist of two strands that are twisted around each other in a spiral shape. The two strands are held together by hydrogen bonds between complementary nucleotide bases. The double helix structure of DNA allows for the replication and transmission of genetic information.Rate this question:
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- 9.
DNA Replication is?
- A.
Begins at specific sites called orgins of replication
- B.
Replication of DNA helix has one new strand and one old strand. Doubles DNA! Ends up with identical daughter molecules of DNA
- C.
DNA replication occurs in both directions simultaneity in the 5' to 3' direction.
Correct Answer
B. Replication of DNA helix has one new strand and one old strand. Doubles DNA! Ends up with identical daughter molecules of DNAExplanation
DNA replication is the process by which a cell duplicates its DNA in preparation for cell division. It begins at specific sites called origins of replication. During replication, the DNA helix is unwound and each strand serves as a template for the synthesis of a new complementary strand. As a result, the replicated DNA helix consists of one new strand and one old strand, effectively doubling the amount of DNA. The end result is the formation of two identical daughter molecules of DNA. Additionally, DNA replication occurs bidirectionally, meaning it proceeds in both directions simultaneously, but always in the 5' to 3' direction.Rate this question:
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- 10.
Polymerases are:
- A.
Are double stranded
- B.
Link newly formed DNA fragments together.
- C.
Enzymes- bases to growing strands and proof read their work
Correct Answer
C. Enzymes- bases to growing strands and proof read their workExplanation
Polymerases are enzymes that play a crucial role in DNA replication. They are responsible for adding nucleotide bases to the growing DNA strands during replication. This process ensures that the newly formed DNA fragments are correctly linked together. Additionally, polymerases also have a proofreading function, where they can detect and correct any errors that may occur during DNA synthesis. Therefore, the correct answer is that polymerases act as enzymes that add bases to growing strands and proofread their work.Rate this question:
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- 11.
DNA ligases are:
- A.
Enzymes- bases to growing strands and proof read their work
- B.
Link newly formed DNA fragments together.
- C.
Are double stranded
Correct Answer
B. Link newly formed DNA fragments together.Explanation
DNA ligases are enzymes that play a crucial role in DNA replication and repair. They have the ability to link or join together newly formed DNA fragments. This process is essential for the completion of DNA replication and the repair of DNA damage. DNA ligases catalyze the formation of phosphodiester bonds between adjacent nucleotides, effectively sealing the gaps between DNA fragments and creating a continuous DNA strand. Therefore, the correct answer is that DNA ligases link newly formed DNA fragments together.Rate this question:
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- 12.
Transcription is:
- A.
The first process. Means to copy DNA.
- B.
Translated code
- C.
Not making the right proteins
Correct Answer
A. The first process. Means to copy DNA.Explanation
The correct answer is the first process. It means to copy DNA. The transcription process involves the synthesis of RNA molecules using a DNA template. During transcription, the DNA strands unwind and RNA polymerase binds to the DNA, creating a complementary RNA strand. This process is crucial for gene expression as it produces messenger RNA (mRNA) molecules that carry the genetic information from DNA to the ribosomes for protein synthesis.Rate this question:
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- 13.
Translation is:
- A.
Not making the right proteins
- B.
The first process. Means to copy DNA.
- C.
Translated code
Correct Answer
C. Translated codeExplanation
The correct answer is "Translated code". This answer is supported by the given information that translation is the process of copying DNA and producing proteins. It can be inferred that "translated code" refers to the process of converting the genetic information from DNA into a specific sequence of amino acids, which ultimately results in the production of proteins.Rate this question:
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- 14.
Mutations:
- A.
Not making the right proteins
- B.
Translated code
- C.
Not making the right proteins
Correct Answer
C. Not making the right proteinsExplanation
The given answer "Not making the right proteins" is a correct explanation for the concept of mutations. Mutations refer to changes or alterations in the DNA sequence, which can lead to errors in the protein synthesis process. Proteins are essential for various biological functions, and if the mutations occur in the coding region of a gene, it can result in the production of incorrect or non-functional proteins. Therefore, the term "Not making the right proteins" accurately describes the consequences of mutations.Rate this question:
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- 15.
How many nucleotides are in our bodies?
- A.
5 million
- B.
3.2 billion
- C.
6 million
Correct Answer
B. 3.2 billionExplanation
The answer "3.2 billion" is correct because our bodies contain a large number of cells, and each cell contains DNA. DNA is made up of nucleotides, which are the building blocks of DNA. The human genome, which is the complete set of DNA in a human, consists of approximately 3.2 billion nucleotides. Therefore, the correct answer is 3.2 billion.Rate this question:
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- 16.
Genetic code is:
- A.
Not making the right proteins
- B.
The sequence of nucleotides in our genes, that dictate the sequence of amino acids in our proteins.
- C.
The first process. Means to copy DNA.
Correct Answer
B. The sequence of nucleotides in our genes, that dictate the sequence of amino acids in our proteins.Explanation
The genetic code refers to the sequence of nucleotides in our genes that determine the sequence of amino acids in our proteins. This code acts as a blueprint for protein synthesis, providing instructions for the order in which amino acids should be assembled to form a specific protein. It is essential for the proper functioning of cells and plays a crucial role in determining an organism's traits and characteristics.Rate this question:
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- 17.
The genetic code is contained in mRNA transcripts, what does the "m" stand for?
- A.
My
- B.
Messenger
- C.
Nucleotides
Correct Answer
B. MessengerExplanation
The "m" in mRNA stands for messenger. Messenger RNA is a type of RNA molecule that carries the genetic information from DNA to the ribosomes, where it is translated into proteins. It acts as a messenger between the DNA in the nucleus and the protein synthesis machinery in the cytoplasm.Rate this question:
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- 18.
MRNA are transcripts that are read in triplets called?
- A.
Nucleotides
- B.
Enzymes
- C.
Codons
Correct Answer
C. CodonsExplanation
mRNA is a molecule that carries the genetic information from DNA to the ribosomes, where it is used as a template for protein synthesis. The mRNA sequence is read in sets of three nucleotides called codons. Each codon codes for a specific amino acid or a stop signal. Therefore, the correct answer is "Codons".Rate this question:
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- 19.
Each codon is made up of how many nucleotides?
- A.
1
- B.
2
- C.
3 nucleotides
Correct Answer
C. 3 nucleotidesExplanation
Each codon is made up of three nucleotides. A codon is a sequence of three nucleotides on a messenger RNA (mRNA) molecule that corresponds to a specific amino acid or serves as a start or stop signal for protein synthesis. The genetic code is read in groups of three nucleotides, and each codon specifies a particular amino acid or function. Therefore, the correct answer is 3 nucleotides.Rate this question:
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- 20.
Does each codon code for a specific amino acid?
- A.
No
- B.
Yes
Correct Answer
B. YesExplanation
Each codon consists of three nucleotides and codes for a specific amino acid. This process is known as translation, where the sequence of codons in mRNA is decoded to produce a specific sequence of amino acids in a protein. Therefore, each codon indeed codes for a specific amino acid, making the correct answer "Yes".Rate this question:
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- 21.
DNA specifies what?
- A.
Means (1) codon for a particular amino acid
- B.
Protein and amino acid that we make up in our bodies. No one makes the same protein
- C.
Your protein levels
Correct Answer
B. Protein and amino acid that we make up in our bodies. No one makes the same proteinExplanation
The correct answer is "Protein and amino acid that we make up in our bodies. No one makes the same protein." DNA contains the genetic instructions that determine the sequence of amino acids in a protein. These amino acids are then assembled to form proteins, which are essential for the structure, function, and regulation of the body's cells, tissues, and organs. Each individual's DNA is unique, resulting in the production of different proteins and contributing to the diversity of traits and characteristics among individuals.Rate this question:
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- 22.
How many condons code amino acids?
- A.
1 codon and 5 amino acids
- B.
5 codons and 25 amino acids
- C.
64 codons coding for 20 amino acids. ***** One start codon and three stop condons*****
Correct Answer
C. 64 codons coding for 20 amino acids. ***** One start codon and three stop condons*****Explanation
The correct answer is 64 codons coding for 20 amino acids. This is because there are 64 possible codons (combinations of three nucleotides) that can be formed from the four nucleotides in DNA or RNA. These codons encode for the 20 different amino acids that make up proteins. Additionally, there is one start codon (AUG) that signals the beginning of protein synthesis and three stop codons (UAA, UAG, UGA) that signal the end of protein synthesis.Rate this question:
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- 23.
For a gene to make protein, what two major processes are involved?
- A.
Perscription
- B.
Transcription
- C.
Translation
Correct Answer(s)
B. Transcription
C. TranslationExplanation
In order for a gene to make a protein, two major processes are involved: transcription and translation. Transcription is the process where the DNA sequence of a gene is copied into a molecule called mRNA. This mRNA molecule then moves out of the nucleus and into the cytoplasm, where translation takes place. Translation is the process where the mRNA is "read" by ribosomes and the corresponding amino acids are assembled to form a protein. These two processes are essential for gene expression and protein synthesis.Rate this question:
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- 24.
Transcription does?
- A.
Makes RNA copy of the gene
- B.
Translates the RNA copy of the gene
- C.
Makes RNA condons to amino acids and builds the protein
Correct Answer
A. Makes RNA copy of the geneExplanation
Transcription is the process in which an RNA molecule is synthesized from a DNA template. It involves the creation of an RNA copy of a specific gene. This RNA copy, known as messenger RNA (mRNA), carries the genetic information from the DNA to the ribosomes, where it is translated into a protein during the process of translation. Therefore, the correct answer is "Makes RNA copy of the gene."Rate this question:
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- 25.
Translation is:
- A.
Translates the RNA copy of the gene
- B.
Makes RNA condons to amino acids and builds the protein
- C.
Makes RNA copy of the gene
Correct Answer
B. Makes RNA condons to amino acids and builds the proteinExplanation
The correct answer is "Makes RNA condons to amino acids and builds the protein." This answer accurately describes the process of translation, where the RNA copy of the gene is used to create a sequence of amino acids, which are then assembled into a protein.Rate this question:
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- 26.
Transcription occurs in the nucleus and follows what manner?
- A.
1.) Initaion-RNA polymerase attache to the promoter region of the gene
- B.
2.) Elongation-RNA polymerase makes a complementary copy of the gene
- C.
3.) Termination- RNA polymerase detaches from the gene when it reaches the terminator region of the gene
Correct Answer(s)
A. 1.) Initaion-RNA polymerase attache to the promoter region of the gene
B. 2.) Elongation-RNA polymerase makes a complementary copy of the gene
C. 3.) Termination- RNA polymerase detaches from the gene when it reaches the terminator region of the geneExplanation
The correct answer is a sequential explanation of the process of transcription. First, initiation occurs when RNA polymerase attaches to the promoter region of the gene. Then, elongation takes place as RNA polymerase makes a complementary copy of the gene. Finally, termination happens when RNA polymerase detaches from the gene upon reaching the terminator region. This sequence accurately describes the steps involved in transcription.Rate this question:
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- 27.
Do you have to split DNA apart to duplicate it to form a single strand of messenger RNA?
- A.
Yes
- B.
No
Correct Answer
A. YesExplanation
DNA replication involves the separation of the two strands of DNA to create two identical copies. This process is necessary to form a single strand of messenger RNA (mRNA) during transcription, where the DNA sequence is used as a template to synthesize mRNA. Therefore, to duplicate DNA and form mRNA, it is essential to split DNA apart.Rate this question:
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- 28.
Can messenger RNA leave the nucleus?
- A.
Yes
- B.
No
Correct Answer
A. YesExplanation
Messenger RNA (mRNA) is a type of RNA molecule that carries genetic information from the DNA in the nucleus to the ribosomes in the cytoplasm, where proteins are synthesized. Therefore, mRNA needs to leave the nucleus in order to perform its function. Once it is transcribed from the DNA template, mRNA undergoes processing and is then transported out of the nucleus through nuclear pores. Therefore, the correct answer is "Yes".Rate this question:
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- 29.
RNA is proceed to mature to mRNA by:
- A.
Adding a cap.( single guanine)
- B.
Adding a tail. (50-200 adenines added after termination)
- C.
Splicing occurs when introns are removed
Correct Answer(s)
A. Adding a cap.( single guanine)
B. Adding a tail. (50-200 adenines added after termination)
C. Splicing occurs when introns are removedExplanation
RNA undergoes several modifications to mature into mRNA. One of these modifications is the addition of a cap, which is a single guanine nucleotide added to the 5' end of the RNA molecule. This cap helps in the stability and recognition of the mRNA by the cellular machinery. Another modification is the addition of a tail, where 50-200 adenine nucleotides are added after the termination of the RNA molecule. This poly(A) tail also aids in mRNA stability and regulation. Lastly, splicing occurs, which is the removal of introns, non-coding regions, from the RNA molecule. This process ensures that only the coding regions, exons, are present in the mature mRNA.Rate this question:
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- 30.
Does splicing allow for one gene to make several proteins?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Splicing is a process in which introns, non-coding regions of DNA, are removed from a gene and the remaining exons are joined together to form a mature mRNA molecule. This mature mRNA can then be translated into a protein. Alternative splicing is a mechanism that allows different combinations of exons to be joined together, resulting in the production of multiple protein isoforms from a single gene. Therefore, splicing does indeed allow for one gene to make several proteins.Rate this question:
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- 31.
Exons are:
- A.
The areas we don't want to contain codes
- B.
The areas we want to contain code
Correct Answer
B. The areas we want to contain codeExplanation
Exons are the areas in a gene sequence that contain the coding regions, which means they are the areas we want to contain code. These regions are responsible for producing functional protein products. In contrast, introns are the non-coding regions that are removed during the process of gene expression. Therefore, the correct answer is "The areas we want to contain code."Rate this question:
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- 32.
Introns are?
- A.
The areas we want to contain code
- B.
The areas we don't want to contain codes
Correct Answer
B. The areas we don't want to contain codesExplanation
Introns are the areas in a gene sequence that do not code for proteins. They are non-coding regions that are transcribed into RNA but are later removed during the process of RNA splicing. Introns are typically found between exons, which are the coding regions of a gene. By removing introns from the final RNA molecule, the remaining exons can be joined together to form a mature mRNA molecule that can be translated into a functional protein. Therefore, introns are the areas we don't want to contain codes.Rate this question:
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- 33.
1% of our DNA that really means anything is in the Exon areas?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because the exons are the coding regions of DNA that contain the instructions for creating proteins. These regions make up only about 1% of the entire DNA sequence. The remaining 99% consists of non-coding regions called introns, which do not directly contribute to protein production. Therefore, the majority of the DNA that has functional significance and carries genetic information is found in the exon areas.Rate this question:
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- 34.
Translation of mRNA to a polypeptide requires?
- A.
MRNA
- B.
TRNA
- C.
Ribosomes
- D.
Codons
Correct Answer(s)
A. MRNA
B. TRNA
C. RibosomesExplanation
Translation of mRNA to a polypeptide requires mRNA, tRNA, and ribosomes. mRNA carries the genetic information from DNA to the ribosomes, where the actual process of translation occurs. tRNA molecules bring the amino acids to the ribosomes based on the codons present in the mRNA. Ribosomes act as the site of protein synthesis, where tRNA molecules bind to the mRNA and facilitate the assembly of amino acids into a polypeptide chain. Therefore, all three components are necessary for the translation process to occur.Rate this question:
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- 35.
TRNA contains the anticodon on one end, and the appropriate amino acid attaches to the other, ending with energy from ATP.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
tRNA, or transfer RNA, is responsible for carrying the appropriate amino acids to the ribosome during protein synthesis. It contains an anticodon on one end, which is complementary to a specific codon on the mRNA strand. This allows the tRNA to recognize and bind to the correct codon. On the other end of the tRNA molecule, the appropriate amino acid is attached. This attachment is facilitated by ATP, which provides the necessary energy for the reaction. Therefore, the statement is true.Rate this question:
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- 36.
RRNA is?
- A.
Ribosomes that coordinated the translation of mRNA to a polypeptide
- B.
Help build protein
- C.
Amino acids
Correct Answer
A. Ribosomes that coordinated the translation of mRNA to a polypeptideExplanation
rRNA, or ribosomal RNA, is a type of RNA molecule that is a structural component of ribosomes. Ribosomes are responsible for the translation of mRNA, or messenger RNA, into a polypeptide chain, which ultimately leads to the synthesis of proteins. Therefore, rRNA plays a crucial role in the process of protein synthesis by coordinating the translation of mRNA to form a polypeptide.Rate this question:
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- 37.
What are the two parts of photosynthesis?
- A.
Transcription
- B.
Translation
- C.
Protein
Correct Answer(s)
A. Transcription
B. TranslationExplanation
The two parts of photosynthesis are transcription and translation. Transcription is the process by which the genetic information in DNA is copied into RNA, specifically messenger RNA (mRNA). Translation is the process by which the mRNA is decoded by ribosomes to produce proteins. These two processes work together to convert the genetic information stored in DNA into functional proteins, which are essential for the functioning of cells and organisms.Rate this question:
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- 38.
Chains mean?
- A.
Are the kind of proteins you make
- B.
Hold you down
- C.
Balls
Correct Answer
A. Are the kind of proteins you make -
- 39.
What are the types of mutations?
- A.
Base pair substitution
- B.
Insertions
- C.
Deletions
- D.
Mutagens ( body makes the mistake)
Correct Answer(s)
A. Base pair substitution
B. Insertions
C. Deletions
D. Mutagens ( body makes the mistake)Explanation
The types of mutations include base pair substitution, insertions, deletions, and mutagens. Base pair substitution occurs when one nucleotide is replaced by another in the DNA sequence. Insertions happen when an extra nucleotide is added to the sequence, while deletions occur when a nucleotide is removed from the sequence. Mutagens are substances or factors that can cause mutations, and in this case, it refers to mutations caused by mistakes made by the body itself.Rate this question:
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- 40.
Sickle cell is:
- A.
Sickle shaped blood cells, mutant hemoglobin DNA
- B.
Sickle mower
Correct Answer
A. Sickle shaped blood cells, mutant hemoglobin DNAExplanation
Sickle cell is a genetic disorder characterized by the presence of sickle-shaped blood cells and a mutation in the hemoglobin DNA. This mutation causes the red blood cells to become rigid and curved, leading to various complications such as anemia, organ damage, and pain crises. The abnormal shape of the cells also affects their ability to carry oxygen efficiently, resulting in further health issues. This condition is inherited and primarily affects individuals of African, Mediterranean, and Middle Eastern descent.Rate this question:
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