Quiz: DNA Fingerprinting Techniques — 8 Fragen

1. Who discovered restriction endonucleases, and in what year?

A. Watson and Crick in 1953

B. Werner Arber and Hamilton Smith in 1968

C. Kary Mullis in 1983

D. Francis Crick in 1962

Answer: (B)

Erklärung

Werner Arber and Hamilton Smith discovered restriction endonucleases in 1968, which are enzymes crucial for DNA analysis and fingerprinting techniques. This fact is explicitly stated in the content.

2. Who is credited with discovering the restriction endonucleases used in DNA fingerprinting, and in which year was this discovery made?

A. Herbert Boyer in 1970

B. Werner Arber in 1962

C. Kary Mullis in 1985

D. Frederick Sanger in 1977

Answer: (B)

Erklärung

Werner Arber, along with Daniel Nathans and Hamilton Smith, was awarded the Nobel Prize in Physiology or Medicine in 1978 for discovering restriction enzymes, which are crucial for DNA fragment analysis in fingerprinting.

3. What is the structure of DNA primarily characterized by?

A. A double helix composed of nitrogenous bases, sugar, and phosphate backbone

B. A globular protein with embedded genetic information

C. A triple helix with alternating sugar and phosphate groups

D. A single strand of nucleotides linked by peptide bonds

Answer: (A)

Erklärung

The correct answer is a double helix composed of nitrogenous bases, sugar, and phosphate backbone, which is the fundamental structure of DNA as described in the source. The other options describe RNA, proteins, or are incorrect representations of DNA.

4. What is the primary purpose of gel electrophoresis in DNA fingerprinting?

A. To amplify DNA samples

B. To separate DNA fragments based on size

C. To stain DNA for visualization

D. To digest DNA with enzymes

Answer: (B)

Erklärung

Gel electrophoresis is used to separate DNA fragments primarily based on their size, with smaller fragments migrating faster through the gel matrix.

5. Which of the following best describes the structure of DNA's backbone?

A. Carbohydrate and amino acid chains

B. Sugar (deoxyribose) and phosphate groups

C. Protein chains linked by peptide bonds

D. Sugar and nitrogenous bases connected by covalent bonds

Answer: (B)

Erklärung

The DNA backbone is made up of alternating sugar (deoxyribose) and phosphate groups, providing structural support to the molecule.

6. In DNA fingerprinting, what does the term 'DNA fragment size' refer to?

A. The amount of DNA in a sample

B. The length of individual DNA pieces after digestion

C. The total number of fragments in the sample

D. The number of base pairs in a gene

Answer: (B)

Erklärung

DNA fragment size refers to the length of individual DNA pieces produced after enzymatic digestion, which is crucial for analysis in fingerprinting.

7. Which DNA bases pair with each other according to the base pairing rules?

A. A with C and G with T

B. A with T and G with C

C. A with G and T with C

D. A with G and T with T

Answer: (B)

Erklärung

In DNA, adenine pairs with thymine, and guanine pairs with cytosine, following the specific hydrogen bonding rules established by Watson and Crick.

8. What role does DNA staining play in fingerprinting techniques?

A. It amplifies the DNA sample

B. It cuts DNA into smaller pieces

C. It visualizes DNA fragments under UV light

D. It separates DNA by size

Answer: (C)

Erklärung

DNA staining involves using dyes that bind to DNA and fluoresce under UV light, allowing visualization of DNA fragments after gel electrophoresis.