Multiple Choice Quizzes - Life Sciences

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

	A.	helped to form the ozone layer that is so important to life today.
	B.	could not have occurred without the oxygen coming from outer space.
	C.	occurred due to carbon dioxide being split by lightning strikes.
	D.	destroyed ozone forming more oxygen.
	E.	occurred because aerobic organisms required the oxygen.

5 points

Question 2

Prions are composed of

	A.	DNA.
	B.	protein.
	C.	DNA and protein.
	D.	DNA, RNA, and protein.
	E.	RNA.

5 points

Question 3

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

	A.	chemoautotrophic bacteria.
	B.	cyanobacteria.
	C.	archaebacteria.
	D.	aerobic bacteria.
	E.	eukaryotic algae.

5 points

Question 4

When taxonomists classify organisms using a phylogenetic approach, they are most concerned with

	A.	ingroups.
	B.	cladists.
	C.	outgroups.
	D.	ancestral traits.
	E.	derived traits.

5 points

Question 5

Atmospheric chemists think that Earth’s first atmosphere

	A.	was very similar to today’s atmosphere.
	B.	consisted of carbon in the form of carbon monoxide.
	C.	contained no oxygen atoms.
	D.	consisted of carbon in the form of carbon dioxide.
	E.	contained nitrogen in the form of ammonia and nitrogen gas.

5 points

Question 6

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

	A.	analogous trait
	B.	outgroups
	C.	cladistic trait
	D.	homologous trait
	E.	derived trait

5 points

Question 7

Most bacteria are

	A.	symbionts.
	B.	chemoautotrophs.
	C.	heterotrophs.
	D.	photoautotrophs.
	E.	microbial predators.

5 points

Question 8

During which geological era did Pangea break apart?

	A.	Cenozoic
	B.	Paleozoic
	C.	Proterozoic
	D.	Archean
	E.	Mesozoic

5 points

Question 9

What is the main difference between protists and bacteria?

	A.	Bacteria have DNA, protists do not.
	B.	Bacteria are always gram-negative, protists are gram-positive
	C.	Protists are unicellular, bacteria are multicellular.
	D.	Protists cannot cause infections, bacteria can
	E.	Protists have a nucleus, bacteria do not

5 points

Question 10

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

	A.	Most protists are single-celled organisms; some are multicellular.
	B.	All protists are single-celled organisms.
	C.	Protists have cell walls composed mainly of peptidoglycans.
	D.	Protists are prokaryotic.
	E.	Protists do not have the ability to move on their own.

5 points

Question 11

The Cambrian Explosion provided a wealth of fossil remains for scientists to uncover. Many of the animals from this time period had tough skins or shells. This would

	A.	make these animals more desirable to predators.
	B.	protect the animal from osmotic pressure.
	C.	allow the animals to move into different environments easily.
	D.	be a disadvantage for these organisms and lead to their death and fossil formation.
	E.	protect the animal from predators.

5 points

Question 12

Endospores form

	A.	to produce two offspring from every one parental cell.
	B.	in response to adverse conditions.
	C.	as a means of genetic recombination.
	D.	when the environmental conditions are favorable.
	E.	during binary fission.

5 points

Question 13

Eukaryotic cells are thought to have

	A.	appeared about 2.1 billion years ago.
	B.	first appeared with tough cell walls.
	C.	developed when mitochondria grew much larger in size that they had been previously.
	D.	evolved before prokaryotic cells.
	E.	first appeared as parts of multicellular organisms.

5 points

Question 14

Some bacteria can form resting structures called ___________ that can withstand extremes in temperature, moisture, and radiation.

	A.	prions
	B.	viroids
	C.	endospores
	D.	capsids
	E.	symbionts

5 points

Question 15

Kelps are a form of what group of protists?

	A.	brown algae
	B.	water molds
	C.	slime molds
	D.	dinoflagellates
	E.	ciliates

5 points

Question 16

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

	A.	nothing alive today.
	B.	blue-green algae present today.
	C.	today’s simplest plants.
	D.	fungi.
	E.	small invertebrate animals.

5 points

Question 17

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

	A.	Protista
	B.	Plantae
	C.	All of these are approximately equivalently diverse.
	D.	Animalia
	E.	Fungi

5 points

Question 18

In bacteria, the cell wall is composed mainly of

	A.	various polysaccharides.
	B.	peptidoglycans.
	C.	glycoproteins.
	D.	proteins.
	E.	lipids.

5 points

Question 19

Which form of bacterial cells is rod shaped?

	A.	spirilla
	B.	bacilli
	C.	rhodius
	D.	vibrios
	E.	cocci

5 points

Question 20

Rickettsias belong to which major group of bacteria?

	A.	cyanobacteria
	B.	Archaea
	C.	spirochetes
	D.	proteobacteria
	E.	viruses