BiotechnologyLesson 1 of 1 in the course Biotechnology

Nucleic Acid Analysis, Molecular Cloning, and Genetic Engineering

5 flashcards · 5 quiz questions · 5 match pairs · 4 fill-in sentences · English

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Summary

Biotechnology uses artificial methods to modify living organisms or cells, often by changing their genetic material. This lesson introduces the nucleic acids and laboratory techniques that make modern biotechnology possible.

Nucleic acids are macromolecules made of nucleotides. Each nucleotide contains a sugar, a phosphate group, and a nitrogenous base. DNA usually consists of two complementary strands held together by hydrogen bonds between paired bases. In eukaryotic cells, the complete set of DNA molecules in the nucleus is called the genome.

All flashcards

What is the role of a plasmid in molecular cloning?
A plasmid can act as a vector, carrying a selected DNA fragment into a bacterial host where it can be copied.
What do restriction enzymes do?
They recognize particular DNA sequences and cut DNA at predictable locations.
How does molecular cloning differ from reproductive cloning?
Molecular cloning copies selected DNA fragments; reproductive cloning aims to produce a genetically identical whole organism.
What is reverse genetics?
A method that starts with a gene or DNA sequence, alters it, and observes the resulting phenotype to infer function.
What is a potential use of embryonic stem cells?
They can develop into many cell types and may support research or future tissue-replacement therapies.

Quiz questions

  1. Which three components make up a nucleotide?Answer: A sugar, a phosphate group, and a nitrogenous base.
  2. Why do researchers often analyze messenger RNA when studying gene expression?Answer: It represents protein-coding genes that are being expressed in a cell.
  3. During gel electrophoresis, which way do negatively charged DNA fragments move?Answer: Toward the positive electrode.
  4. A sample contains too few copies of a DNA region for analysis. Which technique can amplify that selected region?Answer: Polymerase chain reaction.
  5. What specifically makes an organism transgenic, rather than merely a genetically modified organism?Answer: It has received DNA from a different species.

Based on Concepts of Biology by Samantha Fowler, Rebecca Roush, James Wise (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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