3.4

Question 1

unicellular

Answer 1

describes an organism having only one cell

Question 2

multicellular

Answer 2

having many cells. Most plants and animals are multicellular.

Question 3

micrometre

Answer 3

a length of one millionth of a metre

Question 4

nanometre

Answer 4

a unit of measurement equal to one billionth of a metre

Question 5

Nanotechnology

Answer 5

a rapidly developing field that includes studying and investigating cells and other objects of the smallest dimensions

Question 6

Prokaryotes

Answer 6

organism classified as belonging to the Prokaryotae kingdom

Question 7

eukaryote

Answer 7

member of the group of organisms that has a membrane around the nucleus in each of their cells

Question 8

cell membranes

Answer 8

structure that encloses the contents of a cell and allows the movement of some materials in and out

Question 9

cytosol

Answer 9

the fluid found inside cells

Question 10

ribosomes

Answer 10

small structures within a cell in which proteins such as enzymes are made

Question 11

cytoplasm

Answer 11

the jelly-like material inside a cell. It contains many organelles such as the nucleus and vacuoles.

Question 12

metabolism

Answer 12

the chemical reactions occurring within an organism that enable the organism to use energy and grow and repair cells