Microbiology Quiz & Flashcards

Flagella provide motility, allowing bacteria to move toward or away from stimuli.

Archaea have unique cell wall compositions and genetic sequences distinct from bacteria.

The human microbiome aids in digestion and contributes to immune system function.

Binary fission is the main form of asexual reproduction in bacteria.

Antibiotics target specific bacterial processes to inhibit growth or kill bacteria.

Gram-positive bacteria have thicker cell walls than Gram-negative bacteria.

Conjugation involves the transfer of DNA between bacteria through direct contact.

Viruses need a host cell to replicate and cannot do so independently.

Extremophiles survive extreme conditions, offering insights into life's adaptability.

Pili are primarily used for DNA transfer and surface attachment in bacteria.

Binary fission is a form of asexual reproduction, not horizontal gene transfer.

Cyanobacteria perform photosynthesis, contributing to oxygen production and carbon fixation.

Biofilms provide a protective matrix for bacteria, aiding survival in harsh conditions.

Koch's postulates are used to establish a causative link between a microbe and a disease.

Facultatively anaerobic bacteria have the versatility to grow with or without oxygen.

Antibiotics are not effective against viruses, which require different treatments.

Endospores are not a form of reproduction but a survival strategy for harsh conditions.

Viruses cannot replicate independently; they need a host cell for replication.

Fungi decompose organic matter, recycling nutrients back into the environment.

Protozoa are generally not photosynthetic; they obtain nutrients by consuming other organisms.

Halophiles use specialized ion pumps to maintain osmotic balance in saline conditions.

Yeasts, a type of fungi, are used in fermentation processes for bread making.

Plasmids are small, circular DNA molecules in bacteria, replicating independently of the chromosomal DNA.

The Gram stain distinguishes bacteria based on cell wall properties, identifying Gram-positive and Gram-negative types.

Viruses have a protein coat, which encases their genetic material.

Bacteriophages are viruses that specifically infect and replicate within bacterial cells.

Proper handwashing helps prevent infections and does not contribute to antibiotic resistance.

Microbial antagonism inhibits pathogen growth by competition and production of inhibitory substances.

Algae produce oxygen through photosynthesis, playing a key role in aquatic food webs.

Viruses lack a cell membrane, consisting mainly of a protein coat (capsid) and nucleic acids.

Endospores allow bacteria to survive extreme conditions by becoming dormant and highly resistant.

Not all extremophiles are pathogenic; many are harmless and thrive in extreme environments.

Fermentation is an anaerobic process used by bacteria to produce energy without oxygen.

Lichens are symbiotic associations between fungi and algae or cyanobacteria, contributing to ecosystems.

Lactobacillus bacteria ferment milk sugars to produce lactic acid, creating yogurt.

Methanogens produce methane as a by-product of anaerobic respiration, contributing to carbon cycling.

Viruses cannot replicate independently and require a host cell, unlike bacteria.

Mycorrhizal fungi form symbiotic relationships with plants, enhancing nutrient and water uptake.

Horizontal gene transfer increases genetic diversity, allowing bacteria to adapt to changing environments.

Ribosomes are responsible for synthesizing proteins, a critical function for cellular operations.

Photosynthesis is not involved in acquiring antibiotic resistance; it is a method of energy production in plants and some bacteria.

Capsules protect bacteria from being engulfed by phagocytes, enhancing survival in host organisms.

Viruses do not reproduce through cell division; they replicate within host cells using the host's machinery.

Probiotics support gut health by enhancing beneficial gut microbiota and improving digestion.

Binary fission is a form of asexual reproduction exclusive to prokaryotes like bacteria.

Antiviral drugs inhibit viral replication, preventing the virus from multiplying within host cells.

Quorum sensing allows bacteria to communicate and coordinate behavior based on population density.

Viruses do not use binary fission; they enter host cells via methods like endocytosis or membrane fusion.

The Golgi apparatus modifies, sorts, and packages proteins for secretion or use within the cell.