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MCB 2010C Microbiology Exam 1 2024|2025 LATEST 100%
ACCURATE FALL-SPRING FSW
What type of inclusion body will allow bacterial to move in a fluid environment? Gas Vacuole Which is NOT typically found in a bacteria plasma membrane? Site of energy production Contains Cholesterol Composed of a phospholipids bilayer Contains proteins Contains Cholesterol How does Oxygen cross plasma membrane? It moves by simple diffusion. What happens when a bacterial cell is placed in a solution containing 5% NaCl (SALT)? Water will move out of the cell
Fimbria are used for attachment pili are used for Motility A gram positive cell with no visible nucleus _________________? Has a cell wall Which of the following is NOT a function of the glycocalyx? Binary fission Function of glycocalyx
- protect cells from dehydration and nutrient loss
- inhibit killing by white blood cells by phagocytosis (digest foreign invaders) contributing to pathogenicity (to cause disease)
- attachment is by formation of biofilms What is the Glycocalyx? Coating (gel-like) of molecules external to the cell wall, made of sugars and/or proteins
Which diagram of a cell wall contains poris? B which diagram of a cell wall contains teichoic acids? A
Gram positive cell wall Thick peptidoglycan Teichoic acids mycolic acid gram negative cell wall Thin peptidoglycan Outer membrane No mycolic acid Periplasmic space which of the following is NOT true for gram-negative cell walls? They can be toxic to humans They protect the cell in a hypotonic environment Their gram reaction is due to their outer lipid membrane They have a thick peptidoglycan layer They have a thick peptidoglycan layer The purpose of the ocular lens is to magnify the image from the objective lens
Which two stains techniques uses a chemical mordant (using a reagent, not a physical method)? Gram stain; Flagella stain In which type of microscope do you NOT look directly through a lens? Electron microscope Which of the following pairs is NOT correctly matched? Safranin - acid dyed carbolfuchsin- basic dye
crystal violet - basic dye iodine- mordant Safranin - acid dye Steps in staining bacteria & states of bacteria Step 1 Crystal violet (primary stain). Cell stain purple Step 2 Iodine (mordant). Cell remain purple Step 3 Alcohol (decolorizer). Gram positive cells remains purple, Gram negative cells become colorless. Step 4 Safranin (counterstain) Gram positive cells remain purple, gram negative cells appear red. what's the result of a negative fluorescent-antibody test? no fluorescence in the patient sample which of the following pairs is NOT matched correctly? nigrosin- negative stain acidic dye- capsule stain
What's studied using molecular biology? genetic information used for protein synthesis what's called when humans overpower an infectious microorganism? resistance Which of the following is NOT a microorganism? Mushroom protozoan yeast virus A mushroom is NOT a microorganism. Mushrooms are macroscopic fungi-multicellular organisms. microorganisms are typically unicellular/multicellular organisms that cannot be seen with the naked eye. What's biogenesis?
- life from life living organisms come from other living organisms What are microbes that are normally associated with the human body called? human microbiome
transient microbiota the microorganisms that are present in an animal for a short time without causing a disease Virulent microorganisms Pathogens small exposure causes disease in healthy individuals opportunistic microbiota typically non-pathogenic microorganisms that act as a pathogen in certain circumstances. ordinarily do not cause disease in normal habitat in a healthy person but may do so in a different environment or in a compromised host microorganism are NOT involved in which process? smog production microorganism are involved in what process food production decomposition of organic material
