Microscopes and cells - Study guides, Class notes & Summaries

Bright Field Microscope CORRECT ANSWER Most widely used Dark object, bright background Examine stained and unstained specimens Made by putting light through specimen Dark field microscope CORRECT ANSWER Image is lighter than illuminated background Uses a condenser on the light microscope Phase contrast microscope CORRECT ANSWER Used with live specimen Produces image with specimen against gray background Can see internal cells Scanning electron microscope CORRECT ANSWER Detailed 3D...

Last Universal Common Ancestor (LUCA) CORRECT ANSWER Was a microbe of unknown type that lived about 4 billion years ago; the origin of all organisms. What is 16s small unit rRNA used for? CORRECT ANSWER It's used to study construct phylogenetic trees of organisms because it's highly conserved and hasn't changed much over time. Antonie von Leeuwenhoek CORRECT ANSWER Father of microscopy in 1620 Increased surface area like folded membranes CORRECT ANSWER How do larger cells maximize di...

Cytology the study of cells Robert Hooke - observed cork could float - discovered a honeycomb-like structure in a cork slice using a primitive compound microscope - only saw cell walls as this was dead tissue - coined the term "cell" for these individual compartments he saw Two types of microscopes: 1. Light Microscope 2. Electron Microscope Light Microscope - light is focused on specimen by a glass condenser lens - the image is magnified by an objective lens and an ocular lens - proj...

Why is it important to study microbiology? A. Microorganisms are part of the natural environment and important to nutrient cycling. B. Microorganisms are vital to producing essential products. C. Microorganisms are excellent subjects on which to conduct scientific research. D. Microorganisms are linked to many human diseases. E. All of these. correct answers E Which of these groups are single-celled and possess a nucleus? A. Fungi B. Bacteria C. Viruses D. Protozoa ...

Q1 >>> Which of the following statements, A to D, about differential staining is not true? A - Differential staining can distinguish between different organelles. B - Differential staining can distinguish between types of cell. C - Differential staining can distinguish between types of organism. D - Differential staining is a common feature of electron microscopy : *D* Electron microscopes produce black and white images, so stains will not show up A is true - e.g. methylene ...

are antibiotics effective against viral infections? - NO briefly describe eukaryotic cells - -contain nucleus (prokaryotes do not) -contain organelles -selectively permeable cell membrane briefly describe molds - -produce cytoplasmic filaments called hyphae/mycelia -reproduce by spore formation on aerial hyphae briefly describe T. Cruzi - 2 phases: 1. Acute (swelling of eye, cold/flu-like symptoms) 2. Chronic Chagas disease (cardiomyopathy, neurological disorders, etc.) briefly describe...

beta-oxidation correct answer: enzymes repeatedly split off pairs of they hydrogenated carbon atoms that make up a fatty acid and join each pair to coenzyme A to form acetyl-CoA Chloroplasts correct answer: light harvesting structures found in photosynthetic eukaryotes; synthesize a few polypeptides compare and contrast archaeal flagella with bacterial flagella correct answer: archaeal are about half as thick as bacteria; not hollow; lack a central channel; flow together; powered by ATP...

Cytology the study of cells Cell Theory all living things are composed of cells and come from living cells Robert Hooke one of the first to use microscope, observing a piece of cork from the stem of plants, where he found chambers arising in the idea of a cell. Light Microscope takes pictures of large atoms. nucleus, not electrons Scanning Electron Microscope electrons are reflected off of a specimen and are analyzed by a computer to create a 3D image Transmission Electron Microscope Mic...

What was the purpose of this microscope laboratory experiment? - Answer to name the parts of a compound light microscope and their functions, learn the correct way to use the c.l.m what is the difference between magnification and resolution? - Answer magnification: uses special lenses to enlarge image of an object. resolution: separates or distinguishes structures to close together what is the purpose of placing immersion oil on the slide? - Answer prevents scattering of light ...

IB Biology 1.2 Latest Update Already Passed Resolution Resolution is defined as the shortest distance between two points that can be distinquished Explain why electron microscopes have a better resolution than light microscopes because the wavelength of the electrons is thousands of times smaller than the wavelength of light. Ultrastructure all the structures of a biological specimen that are at least 0.1 nm in their smallest dimension Something that electron microscopes can se...