biology lab test #1 Questions and Correct Answers, 2024

biology lab test #1 Questions and Correct Answers, 2024 scan Which objective lens provides the least total magnification? a coverslip When preparing a wet mount specimen for viewing, the specimen should be covered with... rotating nosepiece The objective lenses of the compound light microscope are attached to the False The total magnification achieved using a 10X objective lens with a 10X eyepiece is 20X. microscope compound light microscope oil immersion Which objective lens provides the highest total magnification oil immersion steps 1. Focus on the specimen using the 40x objective lens. 2. Turn the objectives to half way between the 40x and the 100x lens. 3. Apply a drop of immersion oil directly onto area of the slide you were viewing. 4. Rotate the 100x lens over the microscope slide, and use the fine focus adjustment know to sharpen the image. magnification A change in what component of microscopy influences the apparent size of the objects being viewed? 40x What lens could get dirty with oil if you move the revolving nosepiece in the wrong direction after viewing under oil immersion? add a drop of immersion oil before rotating the 100x lens into position. you have successfully focused on an object with the 10x and 40x objective lenses. you have rotated the 100x objective lens into position but are unable to obtain a sharp image by rotating the fine focus adjustment know. Which of the following is most likely to correct this problem? increase the light intensity after focusing on an object with the low power objective lens, you are trying to bring it into focus under the 40x objective lens, but the field of view is very dark. which of the following may remedy this problem? 10x the magnification of the ocular lens is locates the focus plane the coarse adjustment knob on the microscope fine-tunes the focus the fine adjustment knob on the microscope back and forth the mechanical stage upper knob causes the stage to move right and left the mechanical stage lower knob causes the stage to move moveable what does the term motile mean? 1. iris diaphram 2. adjustment knob 3. stage 4. condenser 5. objective lens system 1. increases or decreases the light intensity 2. causes stage (or objective lens) to move upward or downward 3. platform that supports a microscope slide 4. concentrates light onto the specimen 5. after light passes through the specimen, it next enters this lens system 1. eyepiece (ocular) 2. stage (slide) clip 3. field of view 4. arm 5. nosepiece 1. contains a lens at the top of the body tube 2. holds a microscope slide in position 3. circular area seen through the eyepiece 4. serves as a handle for carrying the microscope 5. part to which the objective lenses are attached transfer pipette clean slide tweezers cover slip which of the following items will you need to make a wet mount? false a wet mount requires the addition of certain dyes and cell fixatives approximately 12 hours before viewing the specimen oil immersion increases the resolving power of the specimen using oil immersion is useful because bacteria algae rotifers human cells protozoa pond water can contain many types of organisms. which of the following are you most likely to find in a pond water sample? please select all that apply. albumin solution the biuret test would indicate a positive result for proteins in which of the following solutions? catalytic activity storage of genetic information storage of energy structural support signaling molecules (such as hormones or neurotransmitters) which of the following are functions of carbohydrates (select all that apply0 lipids which groups of molecules are insoluble in water? blue to purple which color change represents a positive reaction for the presence of protein using the biuret test? yellow to purple which color change represents a positive reaction for the presence of starch using the iodine test? blue to orange which color change represents a positive reaction for the presence of sugar using the Benedict's test? 1. iodine 2. biuret test 3. brown paper test 4. benedict's 1. starch 2. protein 3. lipids 4. simple sugars none of these are present an unknown liquid sample is tested for chemical composition. you receive the following results: iodine test= yellow; biuret test= blue; benedict's= blue; and paper lipid test= clear. which of the following are present in the sample? select all that apply protein sugar an unknown liquid sample is tested for chemical composition. you receive the following results: iodine test= yellow; biuret test= purple; benedict's= red; and paper lipid test= clear. which of the following are present in the sample? select all that apply 1. iodine 2. biuret 3. benedict's 1. starch 2. protein 3. simple sugars true the formation of a green color after heating with benedict's reagent indicates that a sample contains simple sugars. lipids carbohydrates which classes of macromolecules have a significant role in energy storage? select all that apply the solution has both simple sugars and starch.