cells and cell theory

Question 1

cell?

Answer 1

basic unit of life.

Question 2

cell walls?

Answer 2

a rigid layer of polysaccharides lying outside the plasma membrane of the cells of plants, fungi, and bacteria. in the algae and higher plants it consists mainly of cellulose. discovered by robert hooke in 1665.

Question 3

live cells?

Answer 3

discovered by anton von leeuwenhoek in 1676.

Question 4

cell theory?

Answer 4

repeated microscopic observations of many organisms. schleiden and schwann generalised to all organisms, 1839. all living organisms made of cells. cells are the basic unit of life. cells arrise from pre existing cells, virchow 1855.

Question 5

organelles?

Answer 5

new advanced technology: electron microscope 1931. allowed people to view the internal structure of the cell. organelles are the discreet cell part which have a specific function.

Question 6

phylogeny?

Answer 6

neutral relatedness between groups of organisms.

Question 7

evolution?

Answer 7

all new species originate from pre existing species. closely related organisms have similar features because they evolved from common ancestral forms. process towards greater complexity.