問 1
1 点According to the principles of cell specialisation, which of the following statements correctly describes the distribution of stem cells in humans?
Oxford AQA International A-level · Biology (9610)
Regulation of transcription and translation：練習問題
その場で採点される選択問題 5 問と、解説つきの記述問題 5 問。すべて「Regulation of transcription and translation」からの出題です。
10 問24 点無料・登録不要
問 2
1 点Which of the following best explains how decreased acetylation of histones leads to the inhibition of transcription?
問 3
1 点What is the primary mechanism by which small interfering RNA (siRNA) regulates gene expression within a cell?
問 4
1 点Abnormal epigenetic changes can lead to the development of cancer. Which combination of changes would most likely result in the inactivation of a tumour suppressor gene?
問 5
1 点Which statement best distinguishes the mechanism of RNA interference (RNAi) from the mechanism of epigenetic control by DNA methylation?
問 6
3 点Explain how increased methylation of DNA inhibits the transcription of a specific target gene.
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
5 点Abnormal epigenetic modifications are frequently observed in malignant cells. Explain why decreased acetylation of histones associated with a tumour suppressor gene would result in a selective advantage for a growing tumour.
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
3 点Contrast multipotent and unipotent stem cells in terms of their differentiation potential and identify one specific tissue in a mature mammal where unipotent stem cells are typically found.
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 9
4 点Although every somatic cell in a mammal contains the same genome, different cell types express different genes. This process is essential for the development of a complex organism.
(a) State what is meant by the term totipotent and explain why these cells are only present for a limited period in mammalian development. (2 points)
(b) Describe how transcription factors regulate the expression of specific genes, allowing a cell to become specialised. (2 points)
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 10
4 点Describe the mechanism by which small interfering RNA (siRNA) regulates gene expression at the translational level. In your answer, explain how the process results in the inhibition of a specific target protein.
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。
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