13. What is an atomic nucleus? (1 point) the outer part of an atom in which electrons move
the outer part of an atom in which neutrons move
the central part of an atom, composed of protons and neutrons
the central part of an atom, composed of protons and electrons
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The nucleus contains protons and neutrons, electrons are located in outer electron cloud.

Hope this helps!

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

the answers are as following:

1. c. double helix, nucleosome, coil, supercoil, chromosome

2. b. g2 phase, preparation for mitosis

3. d. interphase consists of the g1, s, and g2 phases

4. c. metaphase

5. a. chromosomes are duplicated before cell division so that each new daughter cell has a complete set