Chromosomes

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

DNA stands for

Chromosomes are made of what?

what does DNA contain?

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