Question

practice
answer the following questions on cells and cell theory. darken the circle or circles that correspond to your answer choice(s).

1. which of the following forms all matter?

a proteins
b atoms
c cells
d dna

1. what is the main distinguishing factor between matter being considered living or nonliving?

a the presence of elements
b the presence of atoms
c the presence of organic compounds
d the presence of cells

1. identify the three parts of cell theory.

a all cells are made up of various chemical compounds including proteins, carbohydrates, and lipids.
b the cell is the basic unit of structure and function in all living organisms.
c living organisms are made up of one or more cells.
d all matter is composed of chemical elements and compounds.
e cells come from the reproduction of preexisting cells.
f cells may form spontaneously from inorganic compounds.

1. which two of the following scientists are most responsible for determining that all living things are made up of one or more cells?

a robert hooke
b anton van leeuwenhoek
c francesco redi
d matthias schleiden
e theodor schwann
f rudolf virchow

1. which scientist was most responsible for establishing the idea that all cells come from the reproduction of other cells?

a robert hooke
b matthias schleiden
c theodor schwann
d rudolf virchow

1. a scientist studies an object under a microscope. after careful study, the scientist concludes that the object does not represent a living organism. which of the following would best justify the scientist’s conclusion?

a the object cannot move on its own.
b the object shows no signs of reproduction.
c the object contains no evidence of cells.
d the object does not appear to be growing or developing.

Explanation:

1. All matter is composed of atoms; proteins, cells, and DNA are made of atoms.
2. The presence of cells is the key distinction between living and nonliving matter, as cell theory defines life based on cells.
3. The three core tenets of cell theory are: cells are the basic unit of life, all living things are made of cells, and cells come from preexisting cells.
4. Matthias Schleiden (studied plant cells) and Theodor Schwann (studied animal cells) collectively established that all living things are made of one or more cells.
5. Rudolf Virchow proposed that all cells arise from the reproduction of preexisting cells, completing the third part of cell theory.
6. The presence of cells is the fundamental requirement for life; lack of cells is the strongest evidence an object is not living, while movement, reproduction, and growth can be absent in some living things or present in nonliving things.

Answer:

1. B. atoms
2. D. the presence of cells
3. B. The cell is the basic unit of structure and function in all living organisms.

C. Living organisms are made up of one or more cells.
E. Cells come from the reproduction of preexisting cells.

1. D. Matthias Schleiden

E. Theodor Schwann

1. D. Rudolf Virchow
2. C. The object contains no evidence of cells.