問 1
1 点In humans, telomeres are repetitive DNA sequences at the ends of chromosomes. Which of the following statements best explains the role of telomeres and the enzyme telomerase in cellular processes?
IB Diploma Programme (DP) - SL & HL · Biology
D1.1 DNA replication (Molecules)：練習問題
その場で採点される選択問題 3 問と、解説つきの記述問題 5 問。すべて「D1.1 DNA replication (Molecules)」からの出題です。
8 問29 点無料・登録不要
問 2
1 点During DNA replication, DNA polymerase III is responsible for adding nucleotides to the growing strand. However, errors can occur. Which of the following mechanisms primarily contributes to the high fidelity of DNA replication in preventing and correcting these errors?
問 3
1 点The lagging strand during DNA replication is synthesized discontinuously. Which combination of enzymes is directly involved in the synthesis and eventual joining of these discontinuous segments, known as Okazaki fragments?
問 4
3 点Explain why DNA replication is considered semi-conservative.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 5
5 点Differentiate between the functions of DNA polymerase III and DNA polymerase I during prokaryotic DNA replication.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 6
3 点Explain why the enzyme DNA primase is essential for the initiation of DNA synthesis by DNA polymerase III.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 7
7 点Describe the semi-conservative process of DNA replication, outlining the specific roles of the following enzymes and proteins: DNA helicase, DNA gyrase (topoisomerase), single-strand binding proteins, DNA primase, DNA polymerase III, DNA polymerase I, and DNA ligase. Explain how the leading and lagging strands are synthesized differently and why this difference is necessary.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 8
8 点The process of DNA replication involves a series of highly coordinated steps to ensure the entire genome is copied accurately before cell division. This complexity arises from both the chemical structure of the DNA molecule and the specific requirements of the enzymes involved.
a) During replication, the double helix must be stabilized after it is unwound. Explain the importance of single-strand binding proteins (SSBs) in preventing the re-annealing of DNA and protecting the exposed bases from enzymatic degradation.b) Describe the biochemical reaction that provides the energy for the formation of a phosphodiester bond, including the specific role of deoxynucleoside triphosphates (dNTPs) and the byproduct (\(PP_i\)) released during the process.
c) Explain why the discontinuous synthesis of the lagging strand is an inevitable consequence of the antiparallel structure of the DNA double helix combined with the specific directionality requirements (addition to the \(3'\) end) of DNA polymerase III.
まず自分で答えを書いてから、解説と照らし合わせましょう。
※ thinkaのコンテンツはAIにより生成されているため、内容が正確でない場合があります。補助教材としてご使用いただき、公式の教材と合わせてご確認ください。
模範解答は見ました。次はあなたの答案を採点します。
このページは良い答案の形を示せますが、あなたの答案に何が足りないかは教えられません。thinka は実際の採点基準に沿って記述答案を約 15 秒で採点します。
同じような問題をもっと解きたい？このトピックの新しい問題を、解きながら採点。
練習を始める