DNA, Genes & Genetics MCQs with Answers

Cytosine and uracil are found in ?

• A.DNA
• B.RNA
• C.Both DNA and RNA
• D.Proteins

What happens to the number of chromosomes during meiosis?

• A.Chromosomes are halved
• B.Chromosomes are doubled
• C.Chromosomes remain the same
• D.Chromosomes are tripled

Structure of DNA was discovered by ?

• A.James Watson
• B.Francis Crick
• C.Both A and B
• D.Gregor Mendel

Which of the following is a sex-linked genetic disorder?

• A.Hemophilia
• B.Diabetes
• C.Asthma
• D.Arthritis

Change in the base sequence of a gene that alters or eliminates a protein is ?

• A.Mis-sense mutation
• B.Non-sense mutation
• C.Silent mutation
• D.Frame-shift mutation

The ultimate source of genetic variation is _?

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

What are the units arranged on chromosomes that are responsible for hereditary transmission?

• A.Genes
• B.Ribosomes
• C.Lysosomes
• D.Centrioles

A gene is a _?

• A.Form of carbohydrate
• B.Type of protein
• C.Unit of heredity
• D.Unit of energy

Gel electrophoresis is used in?

• A.Separating DNA fragments on the basis of size
• B.Measuring the concentration of proteins
• C.Amplifying DNA sequences
• D.Staining cells for microscopy

The process of making copies of DNA is called?

• A.Transcription
• B.Translation
• C.Replication
• D.Transformation