A human usually has _____ chromosomes in _____ pairs.

What is chromatin? 

How many sister chromatids make up a duplicated chromosome? 

Duplicated chromosomes are only found when? 

• In mitosis, the parent cell chromosomes were duplicated during S phase.

Humans have____________ pairs of chromosomes.

DNA is wrapped around spool like proteins called 

• DNA wrapped around a set of 8 proteins called histones.

What is the scientific name for salt?

What has atoms arranged in an ordered pattern?

What is the basic unit of matter and is the smallest particle of an element?

What is the small repeating entity of the atom structure?

How many sodium atoms are there in NaCl?

Which of the following describes a crystal?

This means the particles that make a mineral line up in a pattern that repeats over and over again.

What state or phase of material are crystals?

Which of the following is a way that crystals can form in nature?

What is a crystal?