The beads-on-a-string form of DNA condenses into a compact fiber called the 30 nm filament. Which of the following is true about its formation?
A. Histone H1 is essential for formation of the 30 nm filament.
B. The histone tails of the octamer histones are absolutely required for filament formation.
C. The zigzag model describes how the nucleosome array adopts a spiral shape when forming the filament.
D. The 30 nm filament is also called a tetranucleosome.
E. The linker histone is essential for formation of the 30 nm filament.
B
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A eukaryotic gene that is regulated by three activator proteins is said to be under
A. triplet regulation. B. individual control. C. self-regulation. D. combinatorial control. E. elastic control.
The only triploid stage in the life cycle of a flowering plant is the:
A. zygote B. embryo C. endosperm D. egg E. stigma tissue
The human population may continue to increase even though it surpasses carrying capacity
Indicate whether the statement is true or false
The evolution of jointed appendages has made ________ very successful.
What will be an ideal response?