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 5 of 32
- A. Ligase
- B. Helicase
- C. Primase
- D. Polymerase
Explanation: Helicase is the enzyme responsible for unwinding and separating the two strands of the DNA double helix at the replication fork, creating…
Correct answer: Helicase- A. Template strand
- B. Coding strand
- C. Okazaki fragment
- D. Introns
Explanation: The transcription bubble is the unwound portion of DNA where RNA is being synthesized.
Correct answer: Template strand- A. DNA polymerase
- B. RNA polymerase
- C. Ligase
- D. Helicase
Explanation: RNA polymerase reads the DNA template strand and synthesizes a complementary RNA strand.
Correct answer: RNA polymerase- A. Strand A
- B. Strand B
- C. Both strands
- D. None
Explanation: The lagging strand is synthesized discontinuously in short segments called Okazaki fragments.
Correct answer: Strand B- A. DNA polymerase I
- B. Ligase
- C. Primase
- D. Topoisomerase
Explanation: During lagging strand synthesis, short DNA segments (Okazaki fragments) are produced.
Correct answer: Ligase- A. Acceptor arm
- B. Anticodon loop
- C. Variable arm
- D. D-loop
Explanation: The anticodon loop carries a sequence of three bases complementary to the mRNA codon.
Correct answer: Anticodon loop- A. Anticodon loop
- B. Acceptor stem (3′ end)
- C. D‑loop
- D. Variable arm
Explanation: The 3' end of tRNA always ends with the sequence CCA, where the amino acid binds.
Correct answer: Acceptor stem (3′ end)- A. Acrocentric
- B. Telocentric
- C. Sub metacentric
- D. Metacentric
Explanation: Acrocentric is defined as the position where centromere is present near the end.
Correct answer: Acrocentric- A. Histone
- B. Nucleosome
- C. Nucleolus
- D. None of the above
Explanation: Every 200 nucleotides, the DNA duplex is coiled around a core of eight histone proteins forming a complex known as a nucleosome which…
Correct answer: Nucleosome- A. Nucleosome
- B. Chromatin
- C. Chromosome
- D. All of the above
Explanation: Coiling occurs when the string of nucleosomes wraps up into higher order coils called super coils, which results in formation of chromatin.
Correct answer: Chromatin- A. Walter Sutton
- B. Oswald Avery
- C. Frederick Griffith
- D. Karl Correns
Explanation: The first evidence of the hereditary nature of DNA was provided by a British microbiologist Frederick Griffith who made some unexpected…
Correct answer: Frederick Griffith- A. Walter Sutton
- B. Hershy and Chase
- C. Fred Griffith
- D. Karl Correns
Explanation: Additional evidence supporting Avery's conclusion was provided in 1952 by Alfred Hershey and Martha Chase, who experimented with…
Correct answer: Hershy and Chase- A. S34
- B. S35
- C. P31
- D. P32
Explanation: The 32P label was transferred to the interior of the bacteria and was found in viruses subsequently released from the infected bacteria.
Correct answer: P32- A. Walter Sutton
- B. Rosalind Franklin
- C. F. Miescher
- D. Karl Correns
Explanation: A German Chemist, Friedrich Miescher, discovered DNA in 1869, only four years after Mendel's work was published.
Correct answer: F. Miescher- A. P.A. Levene
- B. Walther Fleming
- C. F. Miescher
- D. Watson and Crick
Explanation: In the 1920s, the basic structure of nucleic acids was determined by the biochemist P.A.Levene.
Correct answer: P.A. Levene- A. P.A. Levene
- B. Walther Fleming
- C. F. Miescher
- D. Watson and Crick
Explanation: James Watson and Francis Crick, two young researchers at the University of Cambridge, quickly worked out a likely structure of the DNA…
Correct answer: Watson and Crick- A. Dispersive
- B. Conservative
- C. Semi-conservative
- D. None of the above
Explanation: The dispersive model predicted that parental DNA would completely break and that each strand of all the daughter molecules would be a…
Correct answer: Dispersive- A. P.A. Levene
- B. Meselson - Stahl
- C. F. Miescher
- D. Watson and Crick
Explanation: Meselson and Stahl interpreted their results as follows: after the first round of replication, each daughter DNA duplex was a hybrid…
Correct answer: Meselson - Stahl- A. Carbon
- B. Phosporus
- C. Sulphur
- D. Nitrogen
Explanation: Meselson and Stahl grew bacteria in radioactive isotope of nitrogen, N15.
Correct answer: Nitrogen- A. DNA polymerase I
- B. Primase
- C. Ligase
- D. DNA polymerase II
Explanation: When the polymerase reaches the 5' end of the lagging strand, it binds with another enzyme called DNA ligase, which then connects the…
Correct answer: Ligase