Biology

Molecular Biology and Genetics

717 Questions

Molecular biology and genetics explore the structure and function of DNA, RNA, genetic mutations, and heredity. Understanding these building blocks of life is essential for most biology examinations. Review these practice questions to test your molecular genetics knowledge.

DNA structure and basesGenetic mutationsNucleic acids compositionDNA sequencing and replication

Molecular Biology and Genetics Questions

Multiple choice

The chain of nucleotides joined together by phosphodiester bonds is knowna as

  1. Phosphate Backbone

  2. Nitrogen Base

  3. Phosphate Group

  4. Nucleic acids
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The nucleic acids are very large molecules that have two main parts. The backbone of a nucleic acid is made of alternating sugar and phosphate molecules bonded together in a long chain. A chain of nucleotides joined together by phosphodiester bonds. Both DNA and RNA are nucleic acids.

Multiple choice

Purines are comprised of

  1. Adenine and Guanine

  2. Adenine and thymine

  3. Cytosine and uracil

  4. Cytosine and thymine
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Adenine and Guanine

Multiple choice

Mathew, Meselson and Stahlin proved that

  1. DNA replicates by a semiconservative method

  2. DNA is a double -helical structure

  3. DNA is a coiled structure

  4. DNA ia the genetic material
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

DNA replicates by semiconservative method