What is the full form of DNA? a) Deoxyribonucleic acid b) Deoxyribogenetic acid c) Deoxyribonitric acid d) Deoxyriboneuro acid Answer: a) Deoxyribonucleic acid
Where is the DNA located in a cell? a) Cytoplasm b) Cell wall c) Nucleus d) Mitochondria Answer: c) Nucleus
Which of the following is not a nitrogenous base of DNA? a) Thymine b) Cytosine c) Uracil d) Adenine Answer: c) Uracil
Which of these is not a pyrimidine base in DNA? a) Cytosine b) Thymine c) Adenine d) None of these Answer: c) Adenine
Which base is replaced by uracil in RNA? a) Thymine b) Cytosine c) Adenine d) Guanine Answer: a) Thymine
Which of the following pairs is correctly matched? a) Adenine – Guanine b) Cytosine – Adenine c) Guanine – Cytosine d) Thymine – Guanine Answer: c) Guanine – Cytosine
What is the shape of a DNA molecule? a) Ladder b) Spiral c) Circular d) Double helix Answer: d) Double helix
The total number of chromosomes in a human somatic cell is: a) 23 b) 46 c) 22 d) 48 Answer: b) 46
Who discovered the double helix structure of DNA? a) Franklin and Pauling b) Avery and Griffith c) Watson and Crick d) Mendel and Morgan Answer: c) Watson and Crick
Which sugar is found in DNA? a) Glucose b) Ribose c) Sucrose d) Deoxyribose Answer: d) Deoxyribose
Which sugar is present in RNA? a) Deoxyribose b) Ribose c) Glucose d) Lactose Answer: b) Ribose
A single gene controls which of the following? a) One protein b) One enzyme c) One amino acid d) One DNA strand Answer: a) One protein
What is the functional unit of heredity? a) Chromosome b) DNA c) Gene d) Nucleosome Answer: c) Gene
A gene is a segment of which molecule? a) Chromatin b) DNA c) RNA d) Nucleus Answer: b) DNA
Which organelle in a cell is known as the “genetic control center”? a) Nucleolus b) Ribosome c) Mitochondria d) Nucleus Answer: d) Nucleus
Which molecule carries genetic information from DNA to the ribosomes? a) mRNA b) tRNA c) rRNA d) snRNA Answer: a) mRNA
Which molecule helps in protein synthesis by bringing amino acids to ribosomes? a) mRNA b) tRNA c) DNA d) snRNA Answer: b) tRNA
Which of the following is a purine base? a) Cytosine b) Thymine c) Adenine d) Uracil Answer: c) Adenine
Which of these bases are purines in DNA? a) Adenine and Guanine b) Guanine and Cytosine c) Cytosine and Thymine d) Adenine and Thymine Answer: a) Adenine and Guanine
What holds the two strands of DNA together? a) Covalent bonds b) Ionic bonds c) Hydrogen bonds d) Peptide bonds Answer: c) Hydrogen bonds
