- 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