Zadanie 1a
(i) Distinguish the structure of a green leaf cell from that of a typical fungal cell. (ii) Distinguish a plant nuclear chromosome from a typical bacterial chromosome.
DNA packaging around histones
Describe nucleosome organization and use molecular models to examine the association of DNA with histones.
Tę umiejętność sprawdza 10 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 10 Otwórz w wyszukiwarce z filtrami
Zadanie 2a
(i) Using the model, identify the molecule in the outer region and give a reason for your identification. (ii) Describe the molecular structure of the core.
- Materiał graficzny
Zadanie 2b
Suggest why the chromosome of Escherichia coli is not packaged into nucleosomes of this type.
- Materiał graficzny
Zadanie 2
An electron-microscope model of chromatin shows repeated bead-like units along a DNA molecule. What is the basic composition of one nucleosome? A. An entire chromosome enclosed by its nuclear membrane B. A ribosome attached to several amino acids C. A lipid…
Zadanie 2
A chromatin model shows repeated protein cores with a strand wrapped around them. What are the structures indicated by P and Q? A. P: ribosomal RNA; Q: a polypeptide B. P: histone proteins; Q: linker DNA C. P: phospholipids; Q: ribosomal DNA D. P: DNA…
- Materiał graficzny
Zadanie 1b
Describe the structure of a nucleosome.
- Materiał graficzny
Zadanie 20
What role do histone proteins play in a eukaryotic chromosome? A. They supply the catalytic centre of a ribosome B. They join amino acids during translation C. They form the spindle fibres that pull chromosomes apart D. They help package DNA into chromatin
Zadanie 2b
Chromosomes package genetic information. Distinguish the typical chromosome structure of a bacterium from that of a eukaryotic nucleus.
Zadanie 5a
(i) Describe the structure of a nucleosome. (ii) Explain what holds the two DNA strands together. (iii) Outline how tandem-repeat regions are used in DNA profiling.
Zadanie 4a
Identify the labelled type of protein.
- Materiał graficzny