MCB 3020 Exam 2 Study Guide Questions with Latest Update
4 views 0 purchase
Module
MCB 3020
Institution
MCB 3020
What is the most common mechanism for bacterial cell division? - Answer-Binary fission
List the 4 steps of Binary Fission - Answer-1. Elongation of cell
2. Replication of chromosome
3. Separation of chromosomes into 2 parts of cell
4. Formation of septum in middle
Define 'Origin of Replica...
what is the most common mechanism for bacterial ce
Written for
MCB 3020
MCB 3020
Seller
Follow
lectknancy
Reviews received
Content preview
MCB 3020 Exam 2 Study Guide
Questions with Latest Update
What is the most common mechanism for bacterial cell division? - Answer-Binary fission
List the 4 steps of Binary Fission - Answer-1. Elongation of cell
2. Replication of chromosome
3. Separation of chromosomes into 2 parts of cell
4. Formation of septum in middle
Define 'Origin of Replication' - Answer-Where replication begins
How many origins of replication do bacterial chromosomes have? - Answer-1
What is cytokinesis? Include brief overview of its four steps. - Answer-Division of a cell
into two via a formation of a septum in the middle of cell
Penicillin-Binding Protein - Answer-Group of proteins that hydrolyze bonds in existing
peptidoglycan strands and link together new strands
N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) - Answer-Major
components of peptidoglycan that bind to a membrane protein called bactoprenol
Autolysins - Answer-Degrade polypeptide where new units are to be added, and the
new NAM-NAG units can then be inserted into peptidoglycan layer
What is crescentin? - Answer-A homologue or eukaryotic intermediate filaments
What are the other forms of asexual reproduction? Define each - Answer-- Budding:
budding off daughter cells; seen in Listeria monocytogenes
- Baeocyte formation: multiple rounds of cell division; seen in Cyanobacteria
- Spore formation: form multinucleoid filaments that ultimately divide to produce spores
with a single nucleus
Bacterial Growth Curve - Answer-- Lag phase: no net growth because; although the
nutrients are abundant, the bacteria are adjusting to new conditions
- Log (exponential) phase: nutrients are abundant, and bacteria divide at their highest
rate
- Stationary phase: number of viable microorganisms is stable because the nutrients
level off and waste products accumulate
, - Death phase: nutrients are depleted, and levels of waste products and toxins are high,
so number of viable microorganisms decreases
- Long-term stationary phase: nutrients are depleted, and waves of genetic variants
come and go; natural selection
T/F: When nutrient levels are low, limitation of microbial growth occurs as a result of
saturation of transport proteins for nutrient uptake - Answer-False; should when levels
are high
What is the generation time (GT)? - Answer-Time it takes the population to double
What phase is it best to calculate GT? - Answer-Log phase
T/F: Cells typically exist in aqueous conditions - Answer-True
Define hypertonic and hypotonic. - Answer-- Hypertonic: one solution has higher
concentration of solutes than another
- Hypotonic: One solution has lower concentration of solutes than another
If a cell is in a hypertonic solution it will ______, while in a hypotonic solution it will
_______ - Answer-Shrink, burst
What are the 3 distinct cardinal growth temperatures for organisms? - Answer--
Minimum: lowest temp at which an org can grow and survive
- Maximum: highest temp at which an org can grow and survive
- Optimal: most suitable temp for bacterial growth
Halophiles - Answer-Grow best in extremely salty environments
Xerophiles - Answer-Grow best in dry conditions
Psychrophiles - Answer-Grow between 0 C and 20 C - refrigeration temperatures
Mesophiles - Answer-Grow between 20 C and 45 C; most human pathogens
Thermophiles - Answer-Grow between 55 C and 85 C
Hyperthermophiles - Answer-Grow between 85 C and 113 C - usually Archaeans
Aerobe - Answer-Grow in presence of atmospheric oxygen
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller lectknancy. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £12.31. You're not tied to anything after your purchase.
