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DNA RNA PROTEIN

DNA RNA PROTEIN. DNA. 1 . What 2 components make up the DNA backbone? 2 . What 3 components make up a nucleotide? 3 . What are the rungs of the ladder?. Base Pairing. A – T G – C 4 . Write the complementary strand for this sequence. CGC TTA ATG CGA TGA. Question.

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DNA RNA PROTEIN

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  1. DNA RNA PROTEIN

  2. DNA • 1. What 2 components make up the DNA backbone? • 2. What 3 components make up a nucleotide? • 3. What are the rungs of the ladder?

  3. Base Pairing • A – T • G – C • 4. Write the complementary strand for this sequence. • CGC TTA ATG CGA TGA

  4. Question • 5. Suppose a section of DNA has a total of 100 nucleotides in both strands. Of these, 20 have adenine bases. How many of those 100 nucleotides have the following: • Thymine (T) bases: • Cytosine (C) bases: • Guanine (G) bases:

  5. Replication • 6. Describe where each strand of DNA from parent molecule ends up. • 7. What is the main enzyme involved in this process?

  6. Gene Expression • 8. Put the symbols in the correct order: REPLICATION DNA PROTEIN TRANSCRIPTION TRANSLATION RNA

  7. Transcription • RNA polymerase converts DNA to mRNA • A-U • G-C • 9. Convert the following DNA strand to RNA • CGA AAA TGC ATT

  8. Translation • mRNA encoded into amino acids

  9. Mutations • Mutations: mistakes in DNA replication • Point mutations • Substitution • Deletion • Insertion • Chromosomal mutations • Inversions • Translocations

  10. Mutation Examples SUBSTITUTION JEN PET THE WET DOG Sub first E for A JAN PET THE WET DOG INSERTION Insert Z in first word JZE NPE TTH EWE TDO 10. Which is worse for the cell, a substitution or insertion?

  11. Mutation Examples INVERSIONS JEN PET THE WET DOG Flip “THE WET” and put it back in JEN PET TEW EHT DOG TRANSLOCATION JEN PET THE WET DOG DAN RAN ALL DAY JEN / PET THE WET DOG DAN RAN / ALL DAY JEN / ALL DAY DAN RAN / PET THE WET DOG

  12. Causes and Effects of Mutations • Cause: • Radiation • Chemicals • Excessive heat • Effects: • Somatic cells: only affects organism • Gametic cells: can be passed to offspring • Some are actually beneficial • Important source of variation

  13. Practice Questions 11. DNA molecules must unwind and then separate for replication and expression. Which of these happens when the DNA molecule comes apart? a. The weak bonds within the sugar-phosphate backbone are broken. b. The strong bonds within the sugar-phosphate backbone are broken. c. The weak bonds between the nitrogenous base pairs are broken. e. The strong bonds between the nitrogenous base pairs are broken.

  14. Practice Questions 12. When the genes encoded in deoxyribonucleic acid are expressed, what type of molecule is produced? a. DNA b. carbohydrate c. phospholipid b. protein

  15. Practice Questions 13. Which of the following gives the most accurate description of the gene expression process? a. DNA  tRNA  mRNA  amino acid  protein b. DNA  anticodon  codon  tRNA  amino acid c. DNA  mRNA  tRNA  amino acid  protein d. DNA  mRNA  tRNA  codon  amino acid

  16. Practice Questions 14. A double-stranded segment of DNA is 50 nucleotides long along each strand. Thirty of the bases are adenine. How many of the bases are cytosine? a. 20 b. 30 c. 50 d. 80

  17. Practice Questions 15. Suppose that a point mutation inserts a thymine base into a DNA strand as shown blow. T TAA GGT ACG CAT Which represents the DNA strand that is complementary to the first 12 bases of the mutated strand? a. AAT CCA TAG CGT b. AUU CCA UAG CGU c. ATT CCA TGC GTA d AUU CCA UGC GUA

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