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MCB 3020 EXAM 2 STUDY GUIDE QUESTIONS AND ANSWERS $9.00   Add to cart

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MCB 3020 EXAM 2 STUDY GUIDE QUESTIONS AND ANSWERS

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  • MCB3020
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MCB 3020 EXAM 2 STUDY GUIDE QUESTIONS AND ANSWERS

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  • September 21, 2024
  • 183
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • MCB3020
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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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