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Grade 9 DNA, RNA & Protein Synthesis Worksheet with Answers

Grade 9 (US) · Year 10 (UK) · Class 9 (India) · Science

Unit 2: GeneticsDNA & Protein SynthesisNGSS HS-LS1-1

DNA structure, base pairing, transcription and translation — including writing complementary strands. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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DNA, RNA & Protein Synthesis

Grade 9 · Science

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Name

Class

Date

Learning goal: DNA & Protein Synthesis · NGSS HS-LS1-1

Directions: This worksheet has 2 parts. Read the instructions at the start of each part.

Example

Which base pairs with cytosine (C)?

Answer: guanine (G)

RememberDNA base pairs

ATCGTAGCATA pairs with TC pairs with GDNA → RNA → protein(in RNA, U replaces T)
Part A

Match each clue to the right word. Write the letter in the box.

  1. 1Transcribe this DNA template strand into mRNA: CATCCCAGA
  2. 2How many bases make one codon?
  3. 3What does DNA stand for?
  4. 4Write the complementary DNA strand for: TGTCGTCAG
  5. 5Transcribe this DNA template strand into mRNA: ACCCTGGCG
  6. 6Where does translation happen?
  • AThree
  • BDeoxyribonucleic acid
  • CUGGGACCGC
  • DAt the ribosome
  • EGUAGGGUCU
  • FACAGCAGTC
Part B

Answer each question. Use full sentences where you can.

  1. 7

    Why is DNA replication called semi-conservative?

  2. 8

    What is translation?

  3. 9

    What is transcription?

  4. 10

    Transcribe this DNA template strand into mRNA: AGGTATGTG

  5. 11

    What is a gene?

  6. 12

    Write the complementary DNA strand for: GCAAGGTGG

★ Challenge corner for fast finishers

Why do you see lightning before you hear thunder?

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Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/science/9/dna_protein

Answer key (click to show)
  1. 1.E — GUAGGGUCU
  2. 2.A — three
  3. 3.B — deoxyribonucleic acid
  4. 4.F — ACAGCAGTC
  5. 5.C — UGGGACCGC
  6. 6.D — at the ribosome
  7. 7.each new DNA molecule keeps one original strand
  8. 8.reading mRNA to build a protein at the ribosome
  9. 9.copying DNA into messenger RNA
  10. 10.UCCAUACAC
  11. 11.a section of DNA that codes for a protein
  12. 12.CGTTCCACC
  13. ★light travels much faster than sound (challenge corner)

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