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 general knowledge science & technology

DNA, RNA, ATP - Expand

  1. Deoxy DeoxyNucleic Acid, Ribo Nucleic Acid, Adenosine Tri Phosphate

  2. Deoxy RiboNucleic Acid, RiboNucleic Acid, Adenine Tri Phosphate

  3. Deoxy Ribo Nucleic Acid, Ribodeoxy Nucleic Acid, Adenosine Tri Phosphate

  4. DeoxyRIbo Nucleic Acid, Ribo Nucleic Acid , Adenosine Tri Phosphate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

DNA stands for Deoxyribonucleic Acid (lacks one oxygen atom compared to RNA), RNA for Ribonucleic Acid, and ATP for Adenosine Triphosphate. ATP specifically uses 'Adenosine' (the nucleoside) not 'Adenine' (the base alone). Option D correctly identifies these expansions despite minor capitalization and spacing inconsistencies.

Multiple choice general knowledge science & technology

DNA is a polymer of

  1. nucleoside

  2. nucleotide

  3. Adenosine nucleoside

  4. Adenosine nucleotide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DNA is composed of nucleotide monomers linked together in a chain. Each nucleotide contains a phosphate group, deoxyribose sugar, and nitrogenous base.

Multiple choice general knowledge science & technology

DNA band can be seen using which rays.

  1. Infrared rays

  2. UV rays

  3. Violet rays

  4. X-rays
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DNA bands are visualized using ultraviolet (UV) rays because DNA staining dyes like ethidium bromide intercalate between DNA bases and fluoresce when exposed to UV light. This fluorescence makes the DNA bands visible in gel electrophoresis, allowing researchers to analyze DNA fragments.

Multiple choice general knowledge science & technology

Expand DNA

  1. Deoxyribo acid

  2. Deoxyribonucleic acid

  3. Deoxyiamino acid

  4. Deoxyichromonucleic acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DNA stands for Deoxyribonucleic Acid, which is the molecule that carries genetic instructions for life. Option A 'Deoxyribo acid' is incomplete and incorrect. Option C 'Deoxyiamino acid' and Option D 'Deoxyichromonucleic acid' are fictional terms with no scientific meaning.

Multiple choice general knowledge science & technology

What is the four letter Genetic alphabets (nucleotides) which provides the high level mapping from Genetic information in DNA to proteins

  1. A, C, G, S

  2. A, D, G, T

  3. A, C, U, T

  4. A, C, G, T
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The four nucleotides that make up DNA are Adenine (A), Cytosine (C), Guanine (G), and Thymine (T). In RNA, Thymine is replaced by Uracil (U), but the question specifically asks about DNA.

Multiple choice general knowledge

Who is the responcible for inheritence?

  1. RNA

  2. DNA

  3. Amino Acid

  4. Brain
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DNA (Deoxyribonucleic Acid) carries genetic information responsible for inheritance. RNA helps in protein synthesis, amino acids are protein building blocks, the brain is an organ.

Multiple choice general knowledge science & technology

Define DNA

  1. di oxy diribonucleic acid

  2. Di-oxy ribo nucleic acid

  3. ribo nucleic acid

  4. nucleic acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DNA stands for Deoxyribonucleic Acid. Option B 'Di-oxy ribo nucleic acid' captures the correct components: deoxyribose sugar + nucleic acid. Option A has 'diribonucleic' which is misspelled. Option C is just RNA. Option D is incomplete.

Multiple choice general knowledge science & technology

What single letters represent the four nuleotides that make up all DNA sequences?

  1. T G R A

  2. C G T A

  3. L C T G

  4. A C G L
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DNA consists of four nucleotide bases represented by single letters: A (Adenine), T (Thymine), C (Cytosine), and G (Guanine). These four bases in various sequences encode all genetic information. The options with R and L are incorrect as they don't represent standard DNA nucleotides.

Multiple choice general knowledge science & technology

What single letters represent the four nuleotides that make up all DNA sequences?

  1. TGRA

  2. LCTG

  3. CGTA

  4. ACGL
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The four nucleotides that make up DNA are Adenine (A), Thymine (T), Cytosine (C), and Guanine (G). Option C contains all four letters, though the order is not significant in DNA sequences. Options A, B, and D contain incorrect letters (R, L) that are not part of the DNA nucleotide code.