With regard to DNA packaging, prokaryotic chromosomes

A) are devoid of histone or histone-like proteins.
B) are, in general, positively supercoiled.
C) have no higher-level structure, such as looped domains.
D) use RNA to contribute to chromosomal packaging.
E) none of the above


D) use RNA to contribute to chromosomal packaging.

Biology & Microbiology

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Forming skill memories through repetition of an activity such as riding a bike, involves the ____, which controls motor activity

a. cerebellum b. medulla oblongata c. cerebrum d. hippocampus e. hypothalamus

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This fish is infected with a(n)

1.diatom 2.water mold 3.euglenoid 4.alga

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A neutral solution has a pH of

a. 3 b. 5 c. 7 d. 9

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Which of the following is most likely to increase the risks of ASD?

A) exposure to environmental chemicals during pregnancy B) vaccination with the MMR vaccine C) poor parenting D) all of the above

Biology & Microbiology