an overview of cells

Question 1

cell

Answer 1

the structural and functional unit of life

Question 2

the first to discover a dead cell and name it cell

Answer 2

Robert Hooke in 1665

Question 3

robert brown

Answer 3

first to discover the nucleus of the cell

Question 4

the first to observe living cells under his self-discovered microscope

Answer 4

Anton von Leeuwenhock

Question 5

All plants are composed of different cells that form the tissues of cells

Answer 5

Matthias Scheilden

Question 6

Theodore Schwann

Answer 6

• All animal cells had a plasma membrane
• All plant cells had a cell wall
• The bodies of all animals and plants are made of cells and the product of cells

Question 7

Rudolf Virchow

Answer 7

gave the cell theory in 1855

Question 8

the cell theory

Answer 8

1. all cells divide and they arise from preexisting cells
2. all living organisms are made of cells and are the products of cells

Question 9

objections to cell theory

Answer 9

a. viruses do not obey omnis cellula-e-cellula.
b. prokaryotes do not have a nucleus but instead they have a nucleoid structure
c. some living cells do not posses a nucleus

Question 10

smallest cell

Answer 10

mycoplasma (bacteria) 0.3 micrometre

Question 11

largest cell

Answer 11

ostrich egg

Question 12

longest cell

Answer 12

nerve cell

Question 13

prokaryotic cells

Answer 13

pplo (pleuro pneumonia-like organisms)

Question 14

shapes of bacteria

Answer 14

bacillus coccus vibrio spirillum

Question 15

basic characteristics pf prokaryotic cells

Answer 15

1. they have a cell wall surrounding the cell membrane except in mycoplasma.
2. the fluid matrix is filled with cytoplasm.
3. a nuclear membrane does not bind the genetic material.
4. In addition to the genomic DNA they also have small circular DNA called plasmids, that confer other phenotypic characteristics like resistance to antibodies.
5. mesosome is the differentiated form of cell membrane with folds present.
6. the only common organ between P and E is ribosome.