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 19 of 32
- A. RNA Polymerase
- B. tRNA synthetase
- C. Aminocyle-tRNA synthetase
- D. tRNA ligase
Explanation: So, when it comes to linking a specific amino acid with its corresponding tRNA molecule during protein synthesis, there's a special enzyme…
Correct answer: Aminocyle-tRNA synthetase362. A molecule that can act as a genetic material must NOT fulfill which of the traits given below?
- A. It should be able to express itself in the form of 'Mendelian characters
- B. It should be able to generate its replica
- C. It should be unstable structurally and chemically
- D. It should provide the scope for slow changes that are required for evolution
Explanation: Genetic material should be structurally and chemically stable; otherwise, its expression will change.
Correct answer: It should be unstable structurally and chemically- A. Lactose
- B. Lactose and Galactose
- C. Glucose
- D. Galactose
Explanation: In the Lac operon, lactose is an inducer. It binds with a suppressor and inactivates it.
Correct answer: Lactose364. Which transfer RNA molecule is involved in the formation of this part of the sickle cell hemoglobin?
- A. tRNA^Val
- B. tRNA^Glu
- C. tRNA^Met
- D. tRNA^Lys
Explanation: tRNA^Val is the correct answer. Sickle cell anemia is caused by a single amino acid substitution in the beta-globin chain of hemoglobin…
Correct answer: tRNA^Val- A. Double bond
- B. Phosphodiester bonds
- C. Covalent bond
- D. Hydrogen bond
- E. Single bond
Explanation: Each chain of DNA is formed by the union of many nucleotides through phosphodiester bonds. Phosphodiester bonds are covalent bonds.
Correct answer: Phosphodiester bonds- A. Genetic code
- B. Chromosome
- C. Amino acid
- D. Helix
Explanation: The correct answer is A Genetic code. Genetic information in DNA is stored in the form of a genetic code.
Correct answer: Genetic code- A. Genes
- B. Phenotypes
- C. Karyotypes
- D. Cells
Explanation: DNA stores biological information in discrete units called genes. Genes are segments of DNA that contain the instructions for building and…
Correct answer: Genes- A. Double Stranded binding proteins
- B. Double-stranded binding enzymes
- C. Single-stranded binding proteins
- D. Single-stranded binding enzyme
Explanation: Single-stranded (SSBs) are proteins that bind to single-stranded DNA during processes such as DNA replication and repair.
Correct answer: Single-stranded binding proteins- A. 3rd position
- B. 6h position
- C. 5th position
- D. 4th position
Explanation: The sixth position of the beta globin chain of the hemoglobin molecule is where glutamic acid is replaced by valine.
Correct answer: 6h position- A. Basic amino acid
- B. Acidic fatty acid
- C. Başic citric acid
- D. Acidic amino acid
Explanation: Basic amino acids are amino acids that have a positively charged side chain at physiological pH (around 7.4), due to the presence of an…
Correct answer: Basic amino acid- A. Gene
- B. Nucleosome
- C. Centrosome
- D. Centromere
Explanation: A centromere is a region of a chromosome that plays a critical role during cell division.
Correct answer: Centromere- A. Histidine
- B. Uracil
- C. Cytosine
- D. Thymine
Explanation: According to Chargaff's base pairing rule:Adenine (A) always pairs with Thymine (T) → by two hydrogen bondsCytosine (C) always pairs with…
Correct answer: Thymine- A. T. H Morgan
- B. Griffith
- C. Walther
- D. Mendel
Explanation: Walther Flemming first observed chromosomes in 1879 during his studies on cell division (mitosis) using a light microscope.
Correct answer: Walther- A. DNA and protein
- B. DNA and RNA
- C. RNA and lipids
- D. RNA and proteins
Explanation: A chromosome is composed primarily of DNA, proteins, and a small amount of RNA.
Correct answer: DNA and protein- A. Reduction in oxygen-carrying capacity of haemoglobin
- B. Linkage between the polypeptide chains in the haemoglobin molecule
- C. Single amino acid substitution in the haemoglobin molecule
- D. Viral infections of RNA viruses
Explanation: Sickle cell anemia is caused by a genetic mutation in the HBB gene, which provides instructions for making hemoglobin, the protein in red…
Correct answer: Single amino acid substitution in the haemoglobin molecule- A. DNA to Protein
- B. DNA to mRNA
- C. RNA to Protein
- D. DNA to tRNA
Explanation: Transcription is the first step, where DNA is used to synthesize messenger RNA (mRNA).
Correct answer: DNA to mRNA- A. Homochromatin
- B. Heterochromatin
- C. Semi-heterochromatin
- D. Semi-homochromatin
Explanation: Heterochromatin is the tightly packed form of DNA, making it less transcriptionally active.
Correct answer: Heterochromatin- A. DNA
- B. Protein
- C. Both DNA and Protein
- D. Neither DNA nor Protein
Explanation: DNA carries genetic information and is responsible for inheritance.
Correct answer: DNA- A. Osmotic pressure
- B. Hydrolic pressure
- C. Air pressure
- D. Mutation pressure.
Explanation: Mutation pressure refers to changes in the genetic code due to base substitutions, influencing evolution.
Correct answer: Mutation pressure.- A. 11
- B. 33
- C. 333
- D. 1
Explanation: In RNA, each codon is made up of three nucleotide bases, and each codon codes for a specific amino acid.
Correct answer: 33