BMS 503 Study guides, Class notes & Summaries

The ability to cause disease is __________. Correct Answer-pathogenicity Why is there such a difference between the flora in the duodenum and that in the ileum? Correct Answer-There is a large pH difference between these regions of the small intestine. Factors that enhance an organism's ability to adhere to host tissues include __________. Correct Answer-fimbriae Certain traits that allow pathogens to create infection and cause disease are termed Correct Answer-virulence factors. Wh...

A deleterious mutation in recA results in Correct Answer-a decrease in homologous recombination which technique would be used to estimate the concentration of naturally occurring in a wastewater sample Correct Answer-most probable number (MPN) method which of the following features are common to transduction, transformation, and conjugation 1. unidirectional transfer of genes 2. incomplete gene transfer 3. homologous recombination 4. meiosis occurring in the recipient Correct Answer-1...

Anabolism is: a. all of the biochemical reactions taking place in an organism b. all of the energy releasing biochemical reactions in an organism c. all of the biochemical reactions in an organism that use cellular energy d. the maintenance pH at the neutral level preferred by most microorganisms Correct Answer-c. all of the biochemical reactions in an organism that use cellular energy A bacterium that uses glucose as an energy source has been isolated from an anaerobic environment. Afte...

Compared with cellular genomes, viral genomes: A. are larger, with more base pairs. B. are smaller, with fewer base pairs. C. have genomes composed of RNA only. D. also must have double-stranded DNA as their genome. Correct Answer-B. are smaller, with fewer base pairs. Consider a mutation in which the change is from the codon UCU which encodes serine, to ACU which encodes threonine. Which type of point mutation is this? A. nonsense mutation B. frameshift mutation C. silent mutation D....

Compared to Eukaryotes, Bacteria and Archaea have ________ surface-to-volume ratios, causing ________ nutrient exchange and growth rates. A. Lower, slower B. Lower, faster C. Higher, slower D. Higher faster Correct Answer-D. Higher, faster Dr. Strummer prepares a Gram stain of a bacterial soil sample. Which of the following microscopy techniques is most appropriate for viewing his sample: A. Surface electron microscopy B. Brightfield Microcopy C. Fluorescent electron microscopy D. Tra...

Metabolism is: (a) all of the biochemical reactions taking place in an organism (b) all of the energy releasing biochemical reactions in an organism (c) all of the biochemical reactions in an organism that use cellular energy (d) the maintenance of pH at the neutral level preferred by most microorganisms Correct Answer-(a) all of the biochemical reactions taking place in an organism Pasteur's experiments with Swan Neck Flasks disproved which of the following theories on the origin of mi...

Enveloped viral membranes are generally ______________ with associated virus-specific ______________ Correct Answer-Lipid bilayers; proteins Reverse transcriptase is an: Correct Answer-RNA-dependent DNA polymerase Which of the following is true regarding viral attachment proteins (VAP)? Correct Answer-They interact with host cell receptors, can be composed of proteins, carbs or lipids and they define the host range of the virus Restriction is: Correct Answer-A general host mechanism to ...

Deoxyribonucleic acid (DNA) Correct Answer-A polymer of nucleotides conected via a phosphate-deoxyribose sugar backbone; the genetic material of cells and some viruses. Phosphodiester Bond Correct Answer-A type of covalent bond linking nucleotides together in a polynucleotide. Messenger RNA (mRNA) Correct Answer-An RNA molecule that contains the genetic information to encode one or more polypeptides. Transfer RNA (tRNA) Correct Answer-A small RNA molecule used in translation that posses...

Dr. Strummer prepares a Gram stain of a bacterial soil sample. Which of the following microscopy techniques is most appropriate for viewing his sample: A. Surface Electron Microscopy B. Brightfield Microscopy C. Fluorescence Electron Microscopy D. Transmission Electron Microscopy Correct Answer-B Microorganisms are... A. any organism too small to be seen w/o a microscope B. prokaryotes too small to be seen w/o a microscope C. eukaryotes too small to be seen w/o a microscope D. pro...

Robert Hooke Correct Answer-Crude compound microscope Anton von Leeuwenhoek Correct Answer-Hand lense Francesco Redi Correct Answer-refuted nonspontaneous generation of life open jar, tightly sealed jar, mesh covered jar Pasteur's Flask Correct Answer-1st experiment: open air -> life, closed air -> no life 2nd experiment: upright -> no life, titled flask -> life, broken neck -> life germ theory of disease Correct Answer-some microorganisms cause disease Koch's P...