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TEAS 7 Science TEAS 7 Practice Exam 4 To separate genomic DNA fragments by siz...

To separate genomic DNA fragments by size, which of these laboratory methods is most useful?

A. Filtration

B. Spectrophotometry

C. Titration

D. Electrophoresis

Answer Explanation:

One of the most common techniques for separating DNA fragments by size is electrophoresis. Electrophoresis is a process that uses an electric field to move charged molecules through a porous gel matrix. The gel acts as a sieve, allowing smaller molecules to move faster and farther than larger ones. By applying a dye to the DNA samples and loading them into wells at one end of the gel, the DNA fragments can be visualized as bands after electrophoresis. The distance of each band from the well indicates the size of the corresponding DNA fragment.

Therefore, the Correct Answer is D.

More Questions on TEAS 7 Science

  • Q #1:   The measurement indicated by the line across the center of the cell is best referred to as which of the following?

    A. Diameter

    B. Volume

    C. Area

    D. Radius

    Answer Explanation

    One way to assess the size of a cell is to measure its diameter, which is the length of a straight line that passes through the center of the cell and touches both sides. The measurement indicated by the line across the center of the cell in the diagram is best referred to as the diameter of the cell.

  • Q #2: Which of the following reasons explains why it is important for new scientific findings to be published?

    A. Publishing findings will help scientists become more biased.

    B. This prevents other scientists from performing similar tests.

    C. Scientists will get paid if their findings are published.

    D. Other scientists can validate or disprove the findings.

    Answer Explanation

    One of the essential aspects of scientific inquiry is the communication of results to peers and the public. Publishing new scientific findings allows other scientists to review, replicate, or challenge the methods and conclusions of a study. This way, science can advance by building on previous knowledge and correcting any errors or inconsistencies. 

  • Q #3: Which of the following are used to determine a person's DNA sequence?

    A. Enzymes

    B. Blood types

    C. Genes

    D. Hormones

    Answer Explanation

    Genes are used in techniques like DNA sequencing to determine a person's DNA sequence. DNA sequencing involves determining the order of nucleotides (A, T, C, and G) in a DNA molecule. Genes are used to replicate and amplify DNA segments, allowing researchers to analyze the sequence of nucleotides present in a person's DNA

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