Chromosomes

Thread-like structures located inside the nucleus of animal and plant cells are called

DNA stands for

Chromosomes are made of what?

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what does DNA contain?

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DNA is wrapped around spool like proteins called

• hormones

• chemicals

• Histones

• enzymes

Humans have ____________ pairs of chromosomes

• 19

• 23

• 46

• 25

Persons with Down syndrome have an extra copy of Chromosome___

• 3

• 20

• 21

• 5

Most bacteria have___________ DNA

• linear

• Specific

• rigid

• Circular

For an organism to grow and function properly cells must constantly __________ to produce ________________

• divide, new cells

• repeat , die

• divide, copies

• copy, divide

DNA is passed from

• offspring to parents

• Parents to offspring

• Offspring to offspring

• Parent to parent