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Chapter 17 Nucleic Acids and Genetics Study Guide – Step-by-Step Guidance

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Q1. What are the three components of a nucleotide?

Background

Topic: Nucleic Acid Structure

This question tests your understanding of the basic building blocks of nucleic acids (DNA and RNA).

Key Terms

  • Nucleotide: The monomer unit of nucleic acids.

  • Phosphate group, pentose sugar, nitrogenous base: The three main components.

Step-by-Step Guidance

  1. Recall that nucleotides are the repeating units that make up DNA and RNA.

  2. Think about the three distinct parts that are always present in a nucleotide structure.

  3. Identify the type of sugar found in nucleotides (hint: it differs between DNA and RNA).

  4. Remember the group that links nucleotides together in a chain.

Try solving on your own before revealing the answer!

Q2. How are nucleotides different between DNA and RNA?

Background

Topic: Differences between DNA and RNA

This question focuses on the structural differences in the nucleotides that make up DNA and RNA.

Key Terms

  • Deoxyribose vs. Ribose: The sugars in DNA and RNA nucleotides.

  • Thymine vs. Uracil: The nitrogenous bases unique to each nucleic acid.

Step-by-Step Guidance

  1. Recall the sugar present in DNA nucleotides and compare it to the sugar in RNA nucleotides.

  2. List the four nitrogenous bases found in DNA and those in RNA.

  3. Identify which base is unique to DNA and which is unique to RNA.

Try solving on your own before revealing the answer!

Q3. What’s the difference between nucleotides and nucleosides?

Background

Topic: Nucleic Acid Components

This question tests your ability to distinguish between two related molecules involved in nucleic acid structure.

Key Terms

  • Nucleoside: Contains a sugar and a nitrogenous base.

  • Nucleotide: Contains a sugar, a nitrogenous base, and a phosphate group.

Step-by-Step Guidance

  1. Recall the basic structure of a nucleoside.

  2. Recall what is added to a nucleoside to form a nucleotide.

  3. Think about how these differences affect their roles in nucleic acids.

Try solving on your own before revealing the answer!

Q4. What’s the primary structure of nucleic acids? How are two nucleotides joined together?

Background

Topic: Nucleic Acid Structure

This question is about the sequence and bonding in nucleic acids.

Key Terms and Formulas

  • Primary structure: The sequence of nucleotides in a nucleic acid chain.

  • Phosphodiester bond: The type of bond that links nucleotides.

Step-by-Step Guidance

  1. Define what is meant by the primary structure in the context of nucleic acids.

  2. Identify the chemical groups involved in linking two nucleotides.

  3. Describe the type of bond formed and the atoms involved.

Try solving on your own before revealing the answer!

Q5. What are the complementary base pairs in RNA and DNA? How many hydrogen bonds are present in each base pair?

Background

Topic: Base Pairing Rules

This question tests your knowledge of which bases pair together and the strength of their interactions.

Key Terms

  • Complementary base pairs: Specific pairing between nitrogenous bases.

  • Hydrogen bonds: The type of bond holding base pairs together.

Step-by-Step Guidance

  1. List the base pairs for DNA and for RNA.

  2. Recall which bases pair with each other in each nucleic acid.

  3. Identify the number of hydrogen bonds between each pair.

Try solving on your own before revealing the answer!

Q6. What’s DNA double helix? How can you calculate the percentage of each base if the percentage of one base is given?

Background

Topic: DNA Structure and Base Composition

This question covers the structure of DNA and the quantitative relationships between bases.

Key Terms and Formulas

  • Double helix: The three-dimensional structure of DNA.

  • Chargaff's rules: The amount of A equals T, and G equals C in DNA.

Step-by-Step Guidance

  1. Describe the double helix structure of DNA.

  2. Recall Chargaff's rules for base pairing.

  3. If given the percentage of one base (e.g., A), set up equations to find the percentages of the others.

  4. Remember that the total percentage of all four bases must add up to 100%.

Try solving on your own before revealing the answer!

Q7. Write the complementary DNA and RNA strand from a given DNA template.

Background

Topic: Transcription and Replication

This question tests your ability to apply base pairing rules to write complementary strands.

Key Terms

  • Complementary strand: The sequence formed by pairing bases according to base pairing rules.

  • Transcription: The process of making RNA from DNA.

Step-by-Step Guidance

  1. Write out the given DNA template strand.

  2. For the complementary DNA strand, pair A with T and G with C.

  3. For the RNA strand, pair A with U (instead of T), and G with C.

  4. Write the complementary sequences, making sure to match the directionality (5' to 3').

Try solving on your own before revealing the answer!

Q8. During DNA replication, which enzyme unwinds the DNA double helix, and which enzyme adds nucleotides? What mechanism ensures that daughter DNA strands are identical to the parent DNA?

Background

Topic: DNA Replication

This question focuses on the enzymes and mechanisms involved in copying DNA.

Key Terms

  • Helicase: Enzyme that unwinds DNA.

  • DNA polymerase: Enzyme that adds nucleotides.

  • Proofreading: Mechanism for accuracy.

Step-by-Step Guidance

  1. Identify the enzyme responsible for separating the two DNA strands.

  2. Identify the enzyme that synthesizes the new DNA strand by adding nucleotides.

  3. Describe the mechanism that checks for errors during replication.

Try solving on your own before revealing the answer!

Q9. What are the three types of RNA and their functions?

Background

Topic: Types of RNA

This question tests your knowledge of the roles of different RNA molecules in the cell.

Key Terms

  • mRNA, tRNA, rRNA: The three main types of RNA.

Step-by-Step Guidance

  1. List the three types of RNA.

  2. Describe the function of each type in protein synthesis.

  3. Think about where each type is found and what role it plays in the cell.

Try solving on your own before revealing the answer!

Q10. What’s mRNA codon and how do you determine the amino acid it encodes using a codon chart?

Background

Topic: Genetic Code

This question is about how the sequence of mRNA is translated into amino acids.

Key Terms

  • Codon: A sequence of three nucleotides in mRNA.

  • Codon chart: A table used to determine which amino acid corresponds to each codon.

Step-by-Step Guidance

  1. Define what a codon is in the context of mRNA.

  2. Explain how to read a codon chart (first, second, third base positions).

  3. Practice by looking up a sample codon in the chart to find the corresponding amino acid.

Try solving on your own before revealing the answer!

Q11. What are the start and stop codons?

Background

Topic: Translation Initiation and Termination

This question tests your knowledge of how protein synthesis begins and ends.

Key Terms

  • Start codon: The codon that signals the beginning of translation.

  • Stop codons: Codons that signal the end of translation.

Step-by-Step Guidance

  1. Recall the specific codon that serves as the start signal for translation.

  2. List the codons that serve as stop signals.

  3. Think about the amino acid associated with the start codon.

Try solving on your own before revealing the answer!

Q12. Translate an mRNA sequence to peptide.

Background

Topic: Translation

This question tests your ability to use the genetic code to convert an mRNA sequence into a sequence of amino acids.

Key Terms and Formulas

  • Codon: Three-base sequence in mRNA.

  • Peptide: Chain of amino acids.

Step-by-Step Guidance

  1. Divide the mRNA sequence into codons (groups of three bases).

  2. Use a codon chart to determine the amino acid for each codon.

  3. Write the sequence of amino acids as you translate each codon.

  4. Stop translation if you encounter a stop codon.

Try solving on your own before revealing the answer!

Q13. What are the three types of DNA mutations? What is the mutation called if it doesn’t cause amino acid change?

Background

Topic: Mutations

This question is about the different ways DNA can be altered and the effects on protein synthesis.

Key Terms

  • Point mutation, insertion, deletion: Types of mutations.

  • Silent mutation: Mutation that does not change the amino acid.

Step-by-Step Guidance

  1. List the three main types of DNA mutations.

  2. Define each type and how it affects the DNA sequence.

  3. Recall the term for a mutation that does not change the amino acid sequence.

Try solving on your own before revealing the answer!

Q14. Why are insertion mutation and deletion mutation more harmful than point mutation?

Background

Topic: Mutation Effects

This question asks you to compare the consequences of different types of mutations.

Key Terms

  • Frameshift mutation: Caused by insertions or deletions.

  • Point mutation: A single base change.

Step-by-Step Guidance

  1. Define what happens during an insertion or deletion mutation.

  2. Explain how these mutations can shift the reading frame of the genetic code.

  3. Compare this to the effect of a point mutation, which may only affect one amino acid.

Try solving on your own before revealing the answer!

Q15. For a basic understanding of recombinant DNA: What are plasmids, restriction enzymes, and sticky ends? What biomolecule is produced by bacteria containing recombinant DNA plasmids?

Background

Topic: Recombinant DNA Technology

This question covers the tools and products of genetic engineering.

Key Terms

  • Plasmid: Circular DNA in bacteria.

  • Restriction enzyme: Cuts DNA at specific sequences.

  • Sticky ends: Overhanging DNA ends after cutting.

  • Protein: The biomolecule often produced by recombinant bacteria.

Step-by-Step Guidance

  1. Define what a plasmid is and its role in bacteria.

  2. Explain how restriction enzymes are used to cut DNA.

  3. Describe what sticky ends are and why they are important for DNA recombination.

  4. Identify the type of biomolecule commonly produced by bacteria with recombinant plasmids.

Try solving on your own before revealing the answer!

Q16. What is PCR, and what are the steps used to replicate DNA?

Background

Topic: DNA Amplification

This question is about the polymerase chain reaction (PCR) and its steps.

Key Terms

  • PCR (Polymerase Chain Reaction): Technique to amplify DNA.

  • Denaturation, annealing, extension: The three main steps.

Step-by-Step Guidance

  1. Define what PCR is and its purpose.

  2. List the three main steps in a PCR cycle.

  3. Briefly describe what happens in each step.

Try solving on your own before revealing the answer!

Q17. What is virus and what is reverse transcription?

Background

Topic: Viruses and Reverse Transcription

This question tests your understanding of viral structure and a unique process used by some viruses.

Key Terms

  • Virus: Infectious particle made of genetic material and protein coat.

  • Reverse transcription: Process of making DNA from RNA.

Step-by-Step Guidance

  1. Define what a virus is and its basic components.

  2. Explain what reverse transcription is and which viruses use it.

  3. Think about the enzyme involved in reverse transcription.

Try solving on your own before revealing the answer!

Q18. Is there any scientific evidence that proves vaccination cause autism?

Background

Topic: Vaccines and Public Health

This question addresses a common misconception and asks you to consider the scientific consensus.

Key Terms

  • Scientific evidence: Data from well-conducted studies.

  • Vaccine safety: The evaluation of risks and benefits.

Step-by-Step Guidance

  1. Consider what constitutes scientific evidence (peer-reviewed studies, large sample sizes, reproducibility).

  2. Recall the findings of major health organizations regarding vaccines and autism.

  3. Think about the importance of evidence-based medicine in public health decisions.

Try solving on your own before revealing the answer!

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