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 9 of 32
- A. DNA is double helix
- B. Base paring is purine and pyrimidine
- C. DNA is composed of parallel strands
- D. Base pair are plainer
Explanation: Explanation for this question will be added soon!
Correct answer: DNA is composed of parallel strands- A. Both strands are synthesized
- B. None of the strands is synthesized
- C. Only one strand is synthesized
- D. None of the above
Explanation: Explanation for this question will be added soon!
Correct answer: Only one strand is synthesized- A. Both strands contain N14
- B. Both strands contain N15
- C. One strand is N14 and other N15
- D. All of the above
Explanation: This is the correct option. Meselson and Stahl found that after one round of DNA replication in a medium containing only N14, the DNA…
Correct answer: Both strands contain N15- A. Lagging strand does not allow continuous replication
- B. Lagging strand is 3 to 5 direction
- C. Lagging strand is 5 to 3 direction
- D. Lagging strand is placed near to leading strand
Explanation: The main reason for Okazaki fragments forming on the lagging strand is the antiparallel nature of DNA strands and the requirement for DNA…
Correct answer: Lagging strand is 3 to 5 direction- A. Synthesis of DNA
- B. Synthesis of mRNA
- C. Synthesis of protein
- D. All of the above
Explanation: This process involves the creation of new DNA strands through DNA replication.
Correct answer: All of the above- A. It has opposite codes of template strand
- B. It has similar codes as of template strand
- C. Its codes are similar to mRNA codes
- D. Its codes are opposite to mRNA codes
Explanation: The coding (sense) strand has a sequence that matches the sequence of the mRNA transcript, except that it contains thymine (T) instead of…
Correct answer: Its codes are similar to mRNA codes- A. Chromosomes
- B. Cell membrane
- C. Nucleus
- D. Nuclear membrane
Explanation: Chromosomes are thread-like structures made of DNA and proteins. They condense and become visible during cell division to ensure that each…
Correct answer: Chromosomes- A. 2
- B. 6
- C. 4
- D. 3
Explanation: The chromosomes are called telocentric, acrocentric, sub-metacentric and metacentric depending upon the location of centromere between the…
Correct answer: 4- A. Covalent
- B. Hydrogen
- C. Ionic
- D. Phosphodiester
Explanation: Hydrogen bonds are formed between the nitrogenous bases of DNA. Specifically, adenine (A) forms two hydrogen bonds with thymine (T), and…
Correct answer: Hydrogen- A. 5' - 3'
- B. 3' - 5'
- C. Both
- D. None
Explanation: DNA replication proceeds in a directional manner, with new DNA strands synthesized in the 5' to 3' direction.
Correct answer: 5' - 3'- A. Ligase
- B. Polymerase III
- C. Polymerase II
- D. DNAase
Explanation: Ligase is responsible for sealing the nicks between adjacent Okazaki fragments by catalyzing the formation of phosphodiester bonds.
Correct answer: Ligase- A. Nucleoside
- B. Gene
- C. Chromosomes
- D. Nucleotides
Explanation: A gene is a specific sequence of DNA (or RNA in some viruses) that contains the information necessary to produce a functional product…
Correct answer: Gene- A. Transcription
- B. Replication
- C. Translation
- D. None
Explanation: Transcription is the process by which an RNA molecule is synthesized from a DNA template.
Correct answer: Transcription174. UAA represents:
- A. Non-sense codon
- B. Stop codon
- C. Both (A) and (B)
- D. Promoters
Explanation: Non-sense codons, also known as stop codons, are specific sequences of three nucleotides (in DNA or mRNA) that signal the termination of…
Correct answer: Both (A) and (B)- A. None
- B. Ligases
- C. Nucleases and phosphatases
- D. Polymerases
Explanation: Nucleases are enzymes that degrade nucleic acids, while phosphatases remove phosphate groups from molecules.
Correct answer: Nucleases and phosphatases- A. Cancer
- B. Phenylketonuria
- C. Sickle cell anemia
- D. All
Explanation: In 1956, Vernon Ingram's discovery focused specifically on the molecular basis of sickle cell anemia.
Correct answer: Sickle cell anemia- A. Antisense
- B. Sense
- C. Both (A) and (B)
- D. Coding
Explanation: This term refers to the non-coding DNA strand also called template strand that serves as the template for RNA synthesis during…
Correct answer: Antisense- A. Point mutation
- B. Line mutation
- C. Stop mutation
- D. None
Explanation: This occurs when a single nucleotide base is changed, inserted, or deleted from a DNA or RNA sequence.
Correct answer: Point mutation- A. Polymerase III
- B. Primase
- C. DNA ligase
- D. Synthatase
Explanation: Primase is an enzyme responsible for synthesizing RNA primers during DNA replication.
Correct answer: Primase- A. Ionic bond
- B. Hydrophobic interaction
- C. Phosphodiester bond
- D. None
Explanation: The overall stability of DNA is primarily due to the phosphodiester bond.
Correct answer: Phosphodiester bond