Chapter 20

Question 1

True or false: Viruses only have can only have DNA

Answer 1

False, they can have RNA

Question 2

What two parts do all viruses at least have?

Answer 2

Capsid and core

Question 3

Naked viruses are?

Answer 3

Viruses that do not have a cell envelope

Question 4

Obligate intercellular parasites that cannot multiply outside a living cell

Answer 4

Virus

Question 5

True or False: Viruses are host specific.

Answer 5

True

Question 6

Viruses that parasitize bacteria

Answer 6

Bacteriophages

Question 7

5 steps of the lytic cycle (in order)

Answer 7

Attachment, penetration, biosynthesis, maturation, and release

Question 8

Which life cycle of bacteria doesn’t destroy the bacteria?

Answer 8

Lysogenic

Question 9

What enzyme do retroviruses use?

Answer 9

Reverse transcriptase

Question 10

What is an example of an emerging virus?

Answer 10

HIV

Question 11

Naked strands of RNA

Answer 11

Viroids

Question 12

Bacteria and archaea are __________.

Answer 12

Prokaryotes

Question 13

Prokaryotes cell walls are composed of ____________.

Answer 13

Peptidoglycan

Question 14

What do prokaryotes use flagella for?

Answer 14

Movement

Question 15

What are fimbriae used for in prokaryotes?

Answer 15

Attachment

Question 16

A dense area in prokaryotes where the chromosome is located.

Answer 16

Nucleiod

Question 17

Accessory rings of DNA found in some prokaryotes.

Answer 17

Plasmids

Question 18

Splitting of a parent cell into two daughter cells ; asexual reproduction

Answer 18

Binary fission

Question 19

In bacteria, genetic recombination can occur in three ways.

Answer 19

Conjugation
Transformation
Transduction

Question 20

When bacterium pass DNA to a second bacterium through a pili

Answer 20

Conjugation

Question 21

When bacteria takes up free pieces of DNA secreted by live bacteria

Answer 21

Transformation

Question 22

When bacteriophages transfer portions of bacterial DNA from one cell to another

Answer 22

Transduction

Question 23

Unable to grow in the presence of O2

Answer 23

Obligate anaerobes

Question 24

Use light energy to assemble the organic molecules they require

Answer 24

Photoautotrophs

Question 25

Make organic molecules by using energy derived from the oxidation of inorganic compounds in the environment

Answer 25

Chemoautotrophs

Question 26

Take in pre-formed organic nutrients

Answer 26

Chemoheterotrophs

Question 27

When one population modifies the environment In such a way that a second population benefits

Answer 27

Commensalism

Question 28

Both population benefit

Answer 28

Mutualitistic

Question 29

Only one of the populations benefit. Ex: pathogens

Answer 29

Parasitic

Question 30

A symbiotic relationship where the Cyanobacteria provide organic nutrients to the fungus and the fungus protects and supplies inorganic nutrients

Answer 30

Lichens