The DNA of a eukaryotic chromosome is first coiled around histone proteins to form repeating units called
Correct answer: D. nucleosomes
- A. centromeres
- B. kinetochores
- C. chromatids
- D. nucleosomes
Explanation
Each nucleosome is DNA wrapped around a core of eight histones, like beads on a string, and these coil further to condense the chromosome. The centromere is a region of the chromosome and the kinetochore the spindle attachment on it, neither of which packages DNA.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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