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 nucleoside molecule consists of a

  1. pentose sugar and a phosphate group

  2. Phosphate group and nitrogenous base

  3. Pentose sugar and nitrogenous base

  4. pentose sugar, nitrogenous base and phosphate group
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

pentose sugar and nitrogenous base

Multiple choice

Which of the following is found only in RNA but not in DNA?

  1. Adenine

  2. Thymine

  3. Guanine

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

Uracil base is found only in RNA and thymine base is found only in DNA whereas adenine, guanine and cytosine bases are common in both DNA and RNA. DNA contain deoxyribose sugar instead of ribose sugar in RNA. 

Multiple choice

Chromatosome is

  1. nuclesome

  2. DNA

  3. nucleosome and DNA linker

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The chromatosome is a structural unit of chromatin which contains a histone octamer and one linker histone molecule (H5, H1a or H1b in chicken erythrocytes) bound to 168 bp of DNA (core particle DNA extended by 22 bp).

Multiple choice

VNTR stands for

  1. Variable number thymine repeats

  2. Variable number transcription repeats

  3. Variable nucleotide tandem repeats

  4. Variable number tandem repeats
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

fact