Exit Ticket: DNA structure and replication

Exit Ticket · Grade 10 · Biology

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Short Answer Questions

• Q1. Describe the structure of a DNA nucleotide and explain how nucleotides bond together to form a double helix.

• Q2. Explain the role of complementary base pairing during DNA replication and why it is essential for producing accurate copies of DNA.

Reflection

• What part of DNA structure or replication do you feel least confident about, and what specific question do you still have about it?

Multiple Choice

• Q1. Which of the following correctly describes the base pairing rules in DNA?

  • Adenine pairs with Cytosine, and Guanine pairs with Thymine
  • Adenine pairs with Thymine, and Guanine pairs with Cytosine
  • Adenine pairs with Uracil, and Guanine pairs with Cytosine
  • Adenine pairs with Guanine, and Thymine pairs with Cytosine

  Answer: Adenine pairs with Thymine, and Guanine pairs with Cytosine

• Q2. During DNA replication, the process is described as 'semi-conservative.' What does this mean?

  • Both strands of the original DNA are destroyed and two entirely new strands are built
  • Only half of the DNA molecule is replicated at a time
  • Each new DNA molecule contains one original strand and one newly synthesized strand
  • The DNA is copied, but only the coding regions are preserved

  Answer: Each new DNA molecule contains one original strand and one newly synthesized strand

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