Cell division

Question 1

what is a cell?

Answer 1

the smallest structural and functional unit of an organism

Question 2

what is a chromosome?

Answer 2

a threadlike structure of coiled DNA found in the nucleus of eukaryotic cells

Question 3

what is involved in the three stages of cell division?

Answer 3

growth, DNA synthesis and mitosis

Question 4

how are small intestines adapted?

Answer 4

villi- increase surface area they have good blood to maintain concentration gradient thin membranes- short diffusion distance

Question 5

how are the lungs adapted?

Answer 5

alveoli -increases surface area, they have a good blood supply

Question 6

how are roots adapted?

Answer 6

increase surface area

Question 7

how are leaves adapted?

Answer 7

they have a large surface area, thin leaves for a short diffusion path

Question 8

define diffusion

Answer 8

movement of particles in a solution or gas from a higher to a lower concentration

Question 9

define osmosis

Answer 9

movement of water from a dilute solution to a more concentrated solution

Question 10

define active transport

Answer 10

movement of particles from a dilute solution to a more concentrated solution