MODULE 2 - BACTERIAL CHARACTERISTICS Flashcards
Genetic information flows in one specific direction. Which of the following best represents this flow?
DNA – RNA – PROTEIN
These microorganisms only grow in the presence of oxygen
OBLIGATE AEROBES
Which of the following involves bacteriophages?
BACTERIAL TRANSDUCTION
T/F
Bacteria that are unable to synthesize their own metabolites are called heterotrophs
TRUE
T/F
DNA replication produces three new strands of DNA, each having a base sequence complementary to the original strands.
FALSE
Genotype is the genetic composition of an organism. Phenotype is the expression of the genes.
BOTH STATEMENTS ARE TRUE
A chain of bacilli?
STREPTOBACILLI
Which of the following can synthesize all their organic compounds on their own?
AUTOTROPHS
Majority of pathogenic bacteria grow best at neutral or slightly alkaline pH (7.2-7.6).
TRUE
A chain of cocci?
STREPTOCOCCI
The following are factors that affect the growth of bacteria. EXCEPT. A. Temperature B. Oxygen and CO2 C. Dark D. pH
C. DARK
Growth rate is constant, whereby there is a steady state of multiplication
LOG PHASE
Which of the following enzymes proofreads DNA and removes mismatched bases?
DNA POLYMERASE
This initial period is the time required for adaptation to the new environment
LAG PHASE
The cell starts dividing and their numbers increase exponentially with time.
LOGARITHMIC /EXPONENTIAL PHASE
Cell division stops due to depletion of nutrients and accumulation of toxic products.
STATIONARY PHASE
This is the phase when the population decreases due to cell death.
DECLINE PHASE
T/F
Microaerophilic bacteria grow best in environments where there is presence of low oxygen tension
TRUE
T/F
- Thermophilic bacteria are those that grow best at temperatures below 20C.
- The lowest temperature that kills a bacterium under standard conditions in a given time is known as thermal death point.
1ST - FALSE
2ND - TRUE
Facultative anaerobes may even die upon exposure to oxygen
FALSE
Bacteria divide through which process
BINARY FISSION
Mesophilic bacteria grow best at which temperature?
25-40C
Which of the following involves transfer of DNA from a living donor bacterium to a living recipient bacterium by cell-to-cell contact
BACTERIAL CONJUGATION
Phase wherein bacteria are preparing for reproduction and where macromolecules are synthesized
LAG PHASE
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
FALSE
Which of the following is a form of genetic recombination in which a DNA fragment from a dead, degraded bacterium enters a
BACTERIAL TRANSFORMATION
