1) Viruses

A.can mutate.
B.can extract energy from their environment.
C.have a cell membrane.
D.can reproduce on their own.
E.are made of cells.

2) If samples were brought back from a distant planet, what would be the first evidence of life, assuming its evolution followed the same path as Earth's?

A.Presence of nucleic acids
B.Multicellular life forms
C.Oxygen detected
D.Cell membranes
E.Presence of fatty acids

4. organism

A.must contain more than one cell.
B.does not contain genetic information.
C.cannot do biological work.
D.can be generated from nonliving materials today.
E.is either a prokaryote or a eukaryote.

5. A cell

A.always contains a nucleus.
B.is found only in plants and animals.
C.is the fundamental unit of life.
D.is never an entire organism.
E.is always prokaryotic.

6. Oceans were a good environment for early organisms because they

A.contained ozone.
B.shielded organisms from visible light.
C.obviated the need for a cell membrane.
D.shielded organisms from ultraviolet light.
E.were rich in oxygen.

7. Oxygen gas (O2) in Earth's early atmosphere

A.allowed the evolution of anoxic metabolism.
B.depleted ozone in the atmosphere.
C.increased damage to organisms by allowing more ultraviolet light in.
D.allowed organisms to move from the sea to land.
E.was not toxic to most prokaryotes.


8. The organisms that produced the oxygen gas in Earth's atmosphere paved the way for the type of metabolism used by larger organisms, called _______ metabolism.

A.anaerobic
B.photosynthetic
C.aerobic
D.endosymbiotic
E.heterotrophic

9.Relationships between living organisms can best be gleaned by comparing their

A.fossil records.
B.genomes.
C.metabolic processes.
D.anatomical features.
E.behavior.



10.Genomes are

A.the shared genetic information among all living cells.
B.usually made of RNA.
C.made of proteins.
D.the sum of genetic information in a cell.
E.only found in animal and plant cells.


11. All cells in a multicellular organism

A.contain the same genome.
B.have the same function.
C.express the same parts of the genome at the same time.
D.form all the same proteins.
E.randomly express parts of the genome.