Free Chromosomes MCQs with Answers
633 Chromosomes MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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633 questions · page 8 of 32
- A. A site
- B. P site
- C. E site
- D. None of the above
Explanation: Proteins called initiation factor position the tRNA on the ribosomal surface at the P site (peptidyl site) where peptide bonds will form.
Correct answer: P site- A. A site
- B. P site
- C. E site
- D. None of the above
Explanation: Explanation for this question will be added soon!
Correct answer: E site- A. Glycine
- B. Methionine
- C. Alanine
- D. Phenylalanine
Explanation: Explanation for this question will be added soon!
Correct answer: Methionine- A. tRNA synthase
- B. Initiation factor
- C. Elongation factor
- D. Termination factor
Explanation: The binding of tRNA to the ribosomal unit during translation is primarily controlled by a group of proteins known as initiation factors.
Correct answer: Initiation factor- A. tRNA synthase
- B. Initiation factor
- C. Elongation factor
- D. Termination factor
Explanation: Explanation for this question will be added soon!
Correct answer: Elongation factor- A. Termination factor
- B. Elongation factor
- C. Initiation factor
- D. tRNA synthase
Explanation: The movement of the ribosome to the next codon on the mRNA during translation is primarily controlled by elongation factors.
Correct answer: Elongation factor- A. 3'
- B. 4'
- C. 5'
- D. 6'
Explanation: During translation, the ribosome moves along the mRNA molecule in the 5' to 3' direction.
Correct answer: 3'- A. Termination factor
- B. Elongation factor
- C. Initiation factor
- D. Releasing factor
Explanation: The termination codons, also known as stop codons, are recognized by proteins called release factors.
Correct answer: Releasing factor- A. 50 billion km
- B. 100 billion km
- C. 200 billion km
- D. 300 billion km
Explanation: If the DNA of a human adult were lined up end to end, it would stretch nearly 100 billion kilometers, reaching a distance roughly…
Correct answer: 100 billion km- A. Insertion
- B. Point mutation
- C. Deletion
- D. Transposition
Explanation: A point mutation refers to the substitution, insertion, or deletion of a single nucleotide base (or a few bases) in a DNA sequence.
Correct answer: Point mutation- A. Insertion
- B. Point mutation
- C. Deletion
- D. Transposition
Explanation: The addition of one or a few bases into a DNA sequence is called an insertion mutation.
Correct answer: Insertion- A. Insertion
- B. Point mutation
- C. Deletion
- D. Transposition
Explanation: Explanation for this question will be added soon!
Correct answer: Transposition- A. Deletion
- B. Point mutation
- C. Insertion
- D. Aberration
Explanation: The change in the number of chromosomes, either an increase or a decrease from the normal diploid number, is referred to as chromosomal…
Correct answer: Aberration- A. Chemicals
- B. Radiations
- C. Water
- D. None of the above
Explanation: Water is not considered a mutagen. Mutagens are agents that can induce mutations in DNA, potentially leading to changes in the genetic…
Correct answer: Water155. Sickle anemia is a:
- A. Insertion
- B. Point mutation
- C. Deletion
- D. Transposition
Explanation: Sickle cell anemia is indeed caused by a point mutation in the gene that codes for the beta-globin subunit of hemoglobin.
Correct answer: Point mutation- A. Sickle cell anemia
- B. Diabetes
- C. Phenylketonuria
- D. None of the above
Explanation: Phenylketonuria is a genetic disorder caused by a mutation in the gene responsible for producing the enzyme phenylalanine hydroxylase…
Correct answer: Phenylketonuria- A. Genes are present on DNA
- B. Genes are present on chromatids
- C. Genes are present on chromosomes
- D. All of the above
Explanation: The chromosomal theory of inheritance suggests that genes, the units of heredity, are located on chromosomes.
Correct answer: All of the above- A. There are more chromosomes but less gene
- B. There are more gene but less chromosomes
- C. Each chromosome carry only one gene
- D. None of the above
Explanation: The objection was: If Mendelian characters are determined by genes located on the chromosomes, and if the independent assortment of…
Correct answer: There are more gene but less chromosomes- A. All the male were red eyed
- B. All the female were white eyed
- C. Neither of female white eyed
- D. All of the above
Explanation: The strange result observed by T.H. Morgan during his experiments with fruit flies (Drosophila melanogaster) was the absence of any female…
Correct answer: Neither of female white eyed- A. Transforming activity continues after destruction of protein
- B. Transforming activity continues after destruction of lipids
- C. Transforming activity continues after destruction of DNA
- D. Transforming activity continues after destruction of carbohydrates
Explanation: In the experiments conducted by Avery, MacLeod, and McCarty in 1944, they demonstrated that when DNA was destroyed using enzymes that…
Correct answer: Transforming activity continues after destruction of DNA