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MCB 3020 EXAM 2 STUDY GUIDE QUESTIONS AND ANSWERS
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MCB 3020 EXAM 2 STUDY GUIDE QUESTIONS AND ANSWERS
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Name: Score:149 Multiple choice questions
Term 1 of 149
Name an example of an air filter
Surgical masks and cotton plugs on culture vesicles
Air freshener for eliminating odors
Water purifier for drinking water
Vacuum cleaner bags for household use
Term 2 of 149
Facultative Anaerobes
Are unable to grow in the presence of oxygen
Grow better with oxygen than without it (not needed)
Require oxygen to survive
Prefer to grow in acidic environments
,Term 3 of 149
2 Categories of Mutations
1. Elongation of cell
2. Replication of chromosome
3. Separation of chromosomes into 2 parts of cell
4. Formation of septum in middle
- Homologous: involves exchange of homologous sequences of DNA between 2 DNA
molecules
- Site-specific: occurs at specific target sites and is carried out by enzymes called
recombinases
- Transposition: process by which a mobile genetic element such as transposable
element moves
Occurs when small bits of RNA (miRNA or siRNA) inhibit gene expression by binding to
mRNA and either degrading it or preventing translation
- Spontaneous: naturally occurring mutation in absence of an external agent, or
mutagen
- Induced: caused by a mutagen - chemical or physical factors that directly damage
DNA
Term 4 of 149
Describe the R plasmid
Enzymes responsible for breaking down carbohydrates in fungi
Plasmids with genes that decrease bacterial susceptibility to antibiotics
Circular dna molecules found in plant cells
Proteins involved in photosynthesis in bacteria
,Term 5 of 149
What is the most common mechanism for bacterial cell division?
Transcription
Mitosis
Binary fission
Fragmentation
Term 6 of 149
T/F: When nutrient levels are low, limitation of microbial growth occurs as a result of saturation
of transport proteins for nutrient uptake
True
False
Term 7 of 149
Barotolerant
Cannot survive in presence of oxygen
1
Survive increased pressures
Slows
Term 8 of 149
T/F: In Hfr strains, the F factor is integrated into the chromosome rather than in cytoplasm
True
False
Term 9 of 149
T/F: Proteins are polymers of nucleic acids
True
False
, Term 10 of 149
Alternative Splicing
Proteins that bind to nascent polypeptide and ensure they fold correctly, with help of
energy input from ATP
Ex: DnaJ & DnaK in bacteria
A stable, heritable change in a dna sequence
The idea that the same pre-mRNA can be spliced differently, to include or exclude
certain sequences
Plasmids with genes that decrease bacterial susceptibility to antibiotics
Term 11 of 149
T/F: Bacteria chromosomes consist of a single replicon, while eukaryotes have multiple
replicons
True
False
Term 12 of 149
What molecule complex carries out DNA replication?
Helicase
Telomerase
Primase
Replisome
Term 13 of 149
What are the 3 stop codons?
Ethanol And Isopropanol
Circular, Double-stranded, Extrachromosomal Bits Of Dna
Shrink, Burst
UAA, UAG, UGA
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