Question 1

What is the main difference between protists and bacteria?

Bacteria have DNA, protists do not.

Protists have a nucleus, bacteria do not

Bacteria are always gram-negative, protists are gram-positive

Protists are unicellular, bacteria are multicellular.

Protists cannot cause infections, bacteria can

Question 2

Of the following, which kingdom contains the most diversity in terms of DNA sequences?

Protista

Plantae

All of these are approximately equivalently diverse.

Fungi

Animalia

Question 3

During which geological era did Pangea break apart?

Mesozoic

Archean

Proterozoic

Cenozoic

Paleozoic

Question 4

In bacteria, the cell wall is composed mainly of

various polysaccharides.

proteins.

peptidoglycans.

glycoproteins.

lipids.

Question 5

Oxygen built up in the atmosphere approximately 2 billion years ago and

could not have occurred without the oxygen coming from outer space.

occurred because aerobic organisms required the oxygen.

occurred due to carbon dioxide being split by lightning strikes.

helped to form the ozone layer that is so important to life today.

destroyed ozone forming more oxygen.

Question 6

Prions are composed of

RNA.

DNA, RNA, and protein.

DNA and protein.

protein.

DNA.

Question 7

The endosymbiont hypothesis suggests that the mitochondria of eukaryotic cells are descended from captured

eukaryotic algae.

chemoautotrophic bacteria.

aerobic bacteria.

archaebacteria.

cyanobacteria.

Question 8

All but one of the following are false regarding protists. Identify the true statement.

Protists are prokaryotic.

Most protists are single-celled organisms; some are multicellular.

All protists are single-celled organisms.

Protists do not have the ability to move on their own.

Protists have cell walls composed mainly of peptidoglycans.

Question 9

Which form of bacterial cells is rod shaped?

vibrios

spirilla

bacilli

cocci

rhodius

Question 10

Paleontologists have found fossils dating back 3.6 billion years. These closely resemble

fungi.

today’s simplest plants.

small invertebrate animals.

blue-green algae present today.

nothing alive today.

Question 11

Eukaryotic cells are thought to have

appeared about 2.1 billion years ago.

developed when mitochondria grew much larger in size that they had been previously.

evolved before prokaryotic cells.

first appeared as parts of multicellular organisms.

first appeared with tough cell walls.

Question 12

What term is used to indicate a characteristic that is shared and inherited from a common ancestor?