woo clap review Flashcards
In a conjugative mating with an F- recipient cell, which donor cell will allow the recipient to become F+?
F+
“Spikes” in ________ content, sometimes referred to as genomic islands, often indicate that a horizontal gene transfer has occurred in the genome.
GC
In Archaea, some regulatory proteins that control transcription can act as repressors, activators, or both. How is this possible?
When acting as a repressor, the regulatory protein binds to a different DNA sequence than when it is acting as an activator.
What is NOT a major function of the cytoplasmic membrane?
protection from osmotic lysis,
cell wall protects from osmotic lysis
Which of the following statement about biofilms is INCORRECT?
- Biofilms can form on abiotic or biotic material
- Biofilms can be composed of heterogenous or homogenous communities.
- Biofilms are only formed when the organisms is growing at a high density.
- The composition of biofilms varies depending on the organism and surface on which it grows
Biofilms are only formed when the organisms is growing at a high density.
All the following are potential end-products of fermentation EXCEPT ____.
Pyruvic acid
Acetic acid
Lactic acid
Carbon dioxide
Ethanol
Pyruvic acid
Where do autotrophs get their mass?
Air
Which of these statement is false about the gut microbiota?
The gut microbiota is necessary to digest milk for infants
The human gut microbiome may be affected by human gene products. This was demonstrated using metagenomic analysis showing that
identical twins had one particular bacterial species in common more than fraternal twins.
How is the toxin lipid A unique from other bacterial toxins?
It is a breakdown product of a normal outer membrane component.
- endotoxin
The cholera toxin causes ADP-ribosylation of its target and is an example of
an enterotoxin that disrupts function of the intestine.
Which of these is the MOST abundant bacterial group in the colon?
Obligate anaerobes
Is the microbiota composition influenced by an individual’s genetic make up?
yes
_____________enable bacteria to change the promoter specificity of the core RNA polymerase to enable the expression of genes that give them advantages in particular situations
Alternative Sigma factors
Babies need a healthy microbiota or they won’t be able to digest milk.
no, it’s for immune
