Unit 2 quiz questions

Question 1

Which will be part of the differential media and biochemical tests lab?

Answer 1

PEA
EMB
TSA
catalase
thioglycolate
MacConkey Agar

Question 2

A Gram-positive cell will grow on this media while a Gram - bacteria will be poor or inhibited

Answer 2

Phenylethyl Alcohol (PEA)

Question 3

pink/red colonies on MacConkey Agar

Answer 3

gram-negative, lactose-fermenting bacteria

Question 4

no color change/yellow colonies on MacConkey agar

Answer 4

Gram-negative, non-lactose-fermenting bacteria

Question 5

you might expect to see purple to black colonies with or without a green metallic sheen on this type of media

Answer 5

Eosin Methylene Blue Agar (EMB)

Question 6

a cell that uses an organic carbon source and obtains energy from light would be called a?

Answer 6

photoheterotroph

Question 7

a microbe that grows only at the bottom of a tube of thioglycollate medium is probably a(n)

Answer 7

obligate anaerobe

Question 8

a microorganism grows in the lab on medium containing mineral salts but not organic compounds. The organism is likely to be a(n)

Answer 8

autotroph

Question 9

a(n) —- organism require(s) oxygen for growth

Answer 9

obligate aerobic

Question 10

MacConkey agar plates represent —- medium

Answer 10

both a differential and a selective

Question 11

ted heats some food just to boiling, and stores some of it immediately in a container which he places in the refrigerator. A week later he takes the food out and finds it spoiled. THe microbes that spoiled the food are probably — organsims

Answer 11

thermoduric

Question 12

the events of binary fission in order

Answer 12

• the DNA is replicated
• the cell doubles in size
• the cell forms a septum
• the cell separates from its offspring

Question 13

the use of salt and sugar in preserving various types of foods is an application of which of the following concepts?

Answer 13

osmotic pressure

Question 14

anabolic reactions may be characterized by?

Answer 14

forming larger molecules from smaller ones

Question 15

Anaerobic bacteria may use ________ as the final electron acceptor during anaerobic respiration.

Answer 15

either nitrate and sulfate

Question 16

Prokaryotes produce the majority of their ATP

Answer 16

on the cytoplasmic membrane

Question 17

Reactions in which atoms are rearranged within a molecule are catalyzed by

Answer 17

isomerases

Question 18

The molecule that an enzyme acts upon is known as its

Answer 18

substrate

Question 19

true or false: As the concentration of substrate increases, the activity of the enzyme decreases.

Answer 19

False

Question 20

The amount of energy required for a reaction to occur is its activation energy.

Answer 20

true

Question 21

What is an organism that must obtain its carbon in an organic form

Answer 21

Heterotroph

Question 22

What is an organism that uses inorganic CO2 as its carbon source

Answer 22

Autotrophs

Question 23

What is it called when microbes use light to make sugars

Answer 23

Phototroph

Question 24

What is it called when microbes get its energy from chemical compounds?

Answer 24

Chemotroph

Question 25

Which is NOT an essential element?

Answer 25

Calcium

Question 26

What form of endocytosis ingests liquids

Answer 26

Pinocytosis
Pino Grigio -wine- liquid

Question 27

What form of endocytosis ingests whole cells

Answer 27

Phagocytosis

Question 28

What type of symbiosis is it when organisms live in an obligatory but mutually beneficial relationship?

Answer 28

Mutualism

Question 29

What type of symbiosis is it when the partner receives benefits, while its partner is neither harmed nor benefited?

Answer 29

Commensalism

Question 30

What type of symbiosis is it when a host organisms provides the parasitic microbe with nutrients and a habitat, and the host suffers from relationships?

Answer 30

Parasitism

Question 31

Do not require oxygen for metabolism, but use it when it is present?

Answer 31

Facultative anaerobes

Question 32

Lack the metabolic enzyme systems for use in oxygen in respiration — oxygen not required

Answer 32

Obligate anaerobe

Question 33

An organism that cannot grow without oxygen

Answer 33

Obligate aerobe

Question 34

Do not utilize oxygen but can survive and grow to a limited extent in its presence

Answer 34

Aerotolerant anaerobes

Question 35

a bacterial genome is typically what?

Answer 35

a single circular DNA molecule

Question 36

DNA replication and RNA transcription have many features in common. Which of the following does NOT occur in both processes?

Answer 36

a requirement for a primer

Question 37

the bacterial chromosome is found where

Answer 37

• found in the nucleoid
• is circular

Question 38

which contributes to the packaging of bacterial chromosomes?

Answer 38

gyrase

Question 39

which of the following is a characteristic shared DNA and RNA polymerases?

Answer 39

direction of polymerases

Question 40

which of the following is correct about bacterial transcription?
a. A single RNA polymerase produces all RNA transcripts.
b. Rho protein is required for termination of transcription.
c. The mRNA is extensively modified before transcription.
d. It occurs in the periplasm.
e. Various sigma factors recognize different promoter sequences.

Answer 40

various sigma factors recognize different promoter sequences

Question 41

which of the following is CORRECT about BOTH bacterial and eukaryotic DNA replication?

Answer 41

Replication proceeds bidirectionally from the origin of replication

Question 42

what is true of bacterial plasmids

Answer 42

they are small circular DNA molecules that can replicate autonomously

Question 43

genetic elements known as promoters are initiation points in the process of?

Answer 43

transcription