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 17 of 32
- A. 44
- B. 45
- C. 46
- D. 43
Explanation: A diploid cell has two complete sets of chromosomes. Most cells in humans are diploid, comprising 23 chromosome pairs, so 46 chromosomes…
Correct answer: 46- A. They lack cytoplast.
- B. They have a cell wall.
- C. They cannot create proton gradients.
- D. They can conduct mRNA translation simultaneous to transcription.
Explanation: They can conduct mRNA translation simultaneous to transcription is unique to prokaryotes.
Correct answer: They can conduct mRNA translation simultaneous to transcription.- A. 12
- B. 9
- C. 18
- D. 22
Explanation: The haploid (n) number of chromosomes is the number of chromosomes found in a gamete of a reproductive cell.
Correct answer: 18- A. rDNA
- B. dDNA
- C. cDNA
- D. DNA
Explanation: This option is the correct answer. cDNA stands for complementary DNA. It is the DNA molecule synthesized from an RNA template by the…
Correct answer: cDNA- A. A-T
- B. C-G
- C. A-U
- D. T-A
Explanation: In RNA, the two pyrimidine bases are uracil and cytosine. While in DNA, the pyrimidine bases are thymine and cytosine.
Correct answer: A-U- A. 4
- B. 20
- C. 64
- D. 61
Explanation: Each group of three nucleotides encodes an amino acid. The total number of genetic codes can be found by 4^3 = 64, where 4 is the total…
Correct answer: 64- A. Polyploidy
- B. Transmutation
- C. Inversion
- D. Point mutation
Explanation: Phenylketonuria is characterized by a mutation causing the loss of function of the hepatic enzyme phenylalanine hydroxylase through a…
Correct answer: Point mutation- A. Point mutation
- B. Chromosomal mutation
- C. Translocation
- D. Inversion
Explanation: Point mutation is the phenomenon that occurs when a single nucleotide is added, altered, or deleted from an organisms genome.
Correct answer: Point mutation- A. PCR
- B. Semi-conservative model
- C. Conservative mode
- D. Both
Explanation: DNA replication is a semi-conservative process. In this model, the two strands of DNA unwind from each other, and each acts as a template…
Correct answer: Semi-conservative model- A. Translation
- B. Transcription
- C. Polymerization
- D. Genesis
Explanation: Transcription is the process by which the information in a strand of DNA is copied into a new molecule of messenger RNA (mRNA).
Correct answer: Transcription- A. 3' → 5'
- B. 5' → 3
- C. Sometime "3' → 5' & "5' → 3' "
- D. None of the given options
Explanation: DNA replication occurs in the 5' to 3' direction. DNA polymerase can only add nucleotides the 3' -OH group of the growing DNA strand, this…
Correct answer: 5' → 3- A. UAA
- B. UCG
- C. AUG
- D. UUU
Explanation: Translation is the process by which a cell makes proteins using the genetic information carried in messenger RNA (mRNA).
Correct answer: UAA- A. E site
- B. P site
- C. A site
- D. C site
Explanation: In protein synthesis, the initiator tRNA molecule carrying chemically modified initial amino acid, methionine (known as N-formyl…
Correct answer: P site- A. 5 - 2' direction
- B. 5'- 3' direction
- C. 3'- 5 direction
- D. 2 - 5 direction
Explanation: DNA polymerase can only make DNA in the 5' to 3' direction.
Correct answer: 5'- 3' direction- A. tRNA synthetase
- B. Amino tRNA synthetase
- C. tRNA ligase
- D. Aminoacyl tRNA synthetase
Explanation: The enzyme associated with the binding of amino acids and RNA molecules is called "Aminoacyl tRNA synthetase".
Correct answer: Aminoacyl tRNA synthetase- A. RNA polymerase
- B. DNA polymerase
- C. Primase
- D. Ligase
Explanation: The synthesis of a primer is necessary because DNA polymerases, can only attach new DNA nucleotides to an existing strand of nucleotides.
Correct answer: DNA polymerase- A. H1
- B. H2A
- C. H2B
- D. H3
Explanation: A nucleosome is the basic structural unit of DNA packaging in eukaryotes.
Correct answer: H1338. DNA polymerase adds nucleotides to the 3' end of the primer so the direction of replication will be?
- A. 5' to 3'
- B. 3' to 5'
- C. 3' end of the primer to 3' end of template strand
- D. 3' end of the template strand to the 3' end of the primer
Explanation: DNA polymerase is able to add nucleotides only in the 5′ to 3′ direction (a new DNA strand can be extended only in this direction).
Correct answer: 5' to 3'- A. Radioactive phage were found in the pellet
- B. Radioactive cells were found in the supernatant
- C. Radioactive sulfur was found inside the cell
- D. Radioactive phosphorus was found in the cell
Explanation: The experiments by Hershey and Chase helped confirm that DNA was the hereditary material as radioactive phosphorus was found in the…
Correct answer: Radioactive phosphorus was found in the cell- A. 12
- B. 24
- C. 36
- D. 48
Explanation: 12 mRna codons there are 36 nucleotides. As 3 nucleotide cob]combine to form one codon so 3 multiply by 12 gives 36.
Correct answer: 36