DNA, Genes & Genetics MCQs with Answers

Random fluctuation of gene frequencies due to chance alone is called?

• A.Gene flow
• B.Genetic drift
• C.Mutation
• D.Natural selection

Role of mRNA in COVID-19 vaccines like Pfizer and Moderna is to _?

• A.Instructs cells to produce the viral spike protein
• B.Directly destroy the coronavirus in the bloodstream
• C.Act as an antibiotic against bacterial co-infections
• D.Replace damaged lung cells with healthy ones

Genetic information in a DNA molecule is coded in the ?

• A.Sequence of amino acids
• B.Sequence of nucleotides
• C.Sequence of sugars
• D.Sequence of phosphate groups

The functional unit of a gene responsible for the synthesis of one polypeptide is called ?

• A.Cistron
• B.Muton
• C.Recon
• D.Operon

Major breakthrough in biotechnology of the 20th century include ?

• A.Discovery of penicillin
• B.Invention of the microscope
• C.Completion of human genome sequence
• D.Development of the polio vaccine

Guanine-cytosine pairs enhance DNA stability due to ?

• A.Covalent bonding
• B.Fewer hydrogen bonds
• C.Phosphodiester linkage
• D.More hydrogen bonds

What will be the approximate length of DNA strand having 500 nucleotides?

• A.85 nm
• B.340 nm
• C.500 nm
• D.170 nm

Alternate form of a gene is called _?

• A.Allele
• B.Chromosome
• C.Locus
• D.Genotype

Which combination of chromosomes is present in males?

• A.XX
• B.YY
• C.XY
• D.XO

How many daughter cells are produced from meiosis?

• A.Two
• B.Eight
• C.Six
• D.Four