Exploring DNA: Structure and Function

What is the primary function of DNA in living organisms?

• To store energy

• To store genetic information

• To provide structural support

• To catalyze chemical reactions

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following are the components of a nucleotide?

• Amino acid, phosphate group, sugar

• Nitrogenous base, phosphate group, sugar

• Lipid, nitrogenous base, sugar

• Protein, phosphate group, sugar

What is the structure of DNA?

• A Ladder

• A Double Helix

• A Spiral

• A Blob

What is the complementary strand of the DNA sequence 5'-ATCG-3'?

• 3'-TAGA-5'

• 3'-TAGC-5'

• 3'-CGAT-5'

• 3'-CGAA-5'

Given the DNA sequence 5'-GATTACA-3', what is the mRNA sequence transcribed from it?

• 3'-CTAATGT-5'

• 3'-CTAAGGT-5'

• 3'-GACCACA-5'

• 3'-GATAACA-5'

Explain the process of DNA extraction from cells, including the steps of lysis, precipitation, and purification.

• Lysis breaks down the cell membrane, precipitation removes proteins, and purification isolates DNA.

• Lysis breaks down the cell membrane, precipitation isolates DNA, and purification removes contaminants.

• Lysis isolates DNA, precipitation breaks down the cell membrane, and purification removes proteins.

• Lysis removes proteins, precipitation breaks down the cell membrane, and purification isolates DNA.

Which of the following best describes the role of gel electrophoresis in DNA analysis?

• It amplifies DNA sequences for further study.

• It separates DNA fragments based on size for analysis.

• It sequences DNA to determine the exact order of nucleotides.

• It synthesizes new DNA strands from a template.

What is the overall charge of DNA?

• Positive

• Negative

• Neutral

• No Charge

Explain how the complementary base pairing in DNA contributes to its replication process.

• Complementary base pairing allows DNA to form a stable double helix, preventing replication.

• Complementary base pairing ensures that each new DNA molecule is identical to the original, allowing for accurate replication.

• Complementary base pairing allows DNA to form a triple helix, facilitating replication.

• Complementary base pairing prevents mutations during replication by forming identical strands.

What is the role of the phosphate group in a nucleotide?

• It provides energy for cellular processes.

• It forms the backbone of the DNA strand.

• It binds to the nitrogenous base.

• It catalyzes the formation of proteins.