MODULE 2 - BACTERIAL CHARACTERISTICS

Question 1

Genetic information flows in one specific direction. Which of the following best represents this flow?

Answer 1

DNA – RNA – PROTEIN

Question 2

These microorganisms only grow in the presence of oxygen

Answer 2

OBLIGATE AEROBES

Question 3

Which of the following involves bacteriophages?

Answer 3

BACTERIAL TRANSDUCTION

Question 4

T/F

Bacteria that are unable to synthesize their own metabolites are called heterotrophs

Answer 4

TRUE

Question 5

T/F

DNA replication produces three new strands of DNA, each having a base sequence complementary to the original strands.

Answer 5

FALSE

Question 6

Genotype is the genetic composition of an organism. Phenotype is the expression of the genes.

Answer 6

BOTH STATEMENTS ARE TRUE

Question 7

A chain of bacilli?

Answer 7

STREPTOBACILLI

Question 8

Which of the following can synthesize all their organic compounds on their own?

Answer 8

AUTOTROPHS

Question 9

Majority of pathogenic bacteria grow best at neutral or slightly alkaline pH (7.2-7.6).

Answer 9

TRUE

Question 10

A chain of cocci?

Answer 10

STREPTOCOCCI

Question 11

The following are factors that affect the growth of bacteria. EXCEPT. 
A. Temperature 
B. Oxygen and CO2
C. Dark 
D. pH

Answer 11

C. DARK

Question 12

Growth rate is constant, whereby there is a steady state of multiplication

Answer 12

LOG PHASE

Question 13

Which of the following enzymes proofreads DNA and removes mismatched bases?

Answer 13

DNA POLYMERASE

Question 14

This initial period is the time required for adaptation to the new environment

Answer 14

LAG PHASE

Question 15

The cell starts dividing and their numbers increase exponentially with time.

Answer 15

LOGARITHMIC /EXPONENTIAL PHASE

Question 16

Cell division stops due to depletion of nutrients and accumulation of toxic products.

Answer 16

STATIONARY PHASE

Question 17

This is the phase when the population decreases due to cell death.

Answer 17

DECLINE PHASE

Question 18

T/F

Microaerophilic bacteria grow best in environments where there is presence of low oxygen tension

Answer 18

TRUE

Question 19

T/F

1. Thermophilic bacteria are those that grow best at temperatures below 20C.
2. The lowest temperature that kills a bacterium under standard conditions in a given time is known as thermal death point.

Answer 19

1ST - FALSE

2ND - TRUE

Question 20

Facultative anaerobes may even die upon exposure to oxygen

Answer 20

FALSE

Question 21

Bacteria divide through which process

Answer 21

BINARY FISSION

Question 22

Mesophilic bacteria grow best at which temperature?

Answer 22

25-40C

Question 23

Which of the following involves transfer of DNA from a living donor bacterium to a living recipient bacterium by cell-to-cell contact

Answer 23

BACTERIAL CONJUGATION

Question 24

Phase wherein bacteria are preparing for reproduction and where macromolecules are synthesized

Answer 24

LAG PHASE

Question 25

T/F
Transcription is the process in which the information in a sequence of mRNA is used to dictate the amino acid sequence of a protein

Answer 25

FALSE

Question 26

Which of the following is a form of genetic recombination in which a DNA fragment from a dead, degraded bacterium enters a

Answer 26

BACTERIAL TRANSFORMATION