Biology question and answers for January 11, 2024
- Q The medium used for antibiotic sensitivity testing is:Tryptic Soy Agar (TSA)LB with ampicillinLB with ampicillin and arabinoseMueller-Hinton agar
- Q A "susceptible" or "sensitive" result in the Kirby-Bauer test means that the antibiotic will not be effective in treating the bacteria.TrueFalse
- Q A scientist wants to study the kinetics of a specific membrane protein. They ligate the DNAcoding region of the protein to the DNA coding region for GFP and introduce the...
- Q You have discovered a new cytosolic protein that binds to KKXX sequences, preventing these sequences from interacting with other proteins. What is the most likely function of this new protein?It...
- Q A new graduate student is asked to add a nuclear localization sequence (NLS) to the C-terminus of a secreted protein in order to localize the protein to the nucleus. What...
- Q In the presence of high glucose and high lactose, what occurs at the E. coli Lac operon?Operon expression is OFF because there is a repressor protein and there is no...
- Q Which ONE of the following forms of transport would you expect to be the fastest for a small ion?Passive diffusionTransport by a membrane protein driven by ATP hydrolysisFacilitated transport via...
- Q In this Lab, we saw three bands in our gel from our bacterial rRNA, how would this differ if we had used isolated human rRNA? 2 marks Since human rRNA...
- Q Which scientists are credited for the events described in the development of the cell theory?used the word cell for the structures he observed when he examined a piece of cork...
- Q What is a common feature of cellular membranes?Membrane fluidity is maintained by protein enzymes.They require carbohydrates for solubility in water.They provide an environment to denature proteins.They can create regions of...
- Q The electrochemical gradient of an ion is composed of its concentration gradient andthe pH gradienthow permeable the membane is to that ionthe membrane potentialwhether there are open channels for that...
- Q Which of the following would not be a stage in the cycle of domesticviolence?The Tension Building PhaseThe Bargaining PhaseThe Acute Battering Episode PhaseThe Honeymoon Phase
- Q In models of logistic population growth,the population growth rate slows dramatically as N approaches K.only density-dependent factors affect the rate of population growth.new individuals are added to the population as...
- Q Substances that are naturally produced by certain microorganisms that can inhibit or destroy bacteriaantibioticsnarrow-spectrum drugs.semisynthetic drugssynthetic drugsbroad-spectrum drugs.called
- Q Which of the following is NOT a factor in the movement of water into tissues?salinaity gradientfluid pressureactive transportdiffusionosmotic gradient
- Q The operation of the sodium-potassium "pump" movessodium and potassium ions into the mitochondria.sodium and potassium ions out of the cell.sodium ions out of the cell and potassium ions into the...
- Q In a typical nerve cell, the nucleus is found in thecell body.synapse.axonal region.synaptic terminals.dendritic region.
- Q Which of the following is not characteristic of the synaptic vesicle? Select the best answer.also known as the cell bodycontains neurotransmitterscontained in terminal buttons
- Q Extracellular digestion means that:the digestion occurs in the hostthe digestion occurs inside the alimentary canalthe digestion is conducted by macrophages in the extracellular matrixthe digestion occurs out of the bodythe...
- Q Finding cells when examining various types of tissues under the microscope helped scientists agree on the first principle of cell theory. Which of the following is the first principle of...
- Q A cytologist finds that antibiotic X interferes with the ability of the ribosomes in bacterial cells to move. What step would likely be affected if the bacteria are exposed to...
- Q A mutated tumor suppressor gene...A. might cause cancerB. can lead to mutations in the DNAC. might favor viral infectionsD. correct errors that arise when cells duplicate their DNA prior to...
- Q When a bacterium has a viral DNA incorporated into its genome, the bacterium becomes a ...provirusprophagetemperate celllysogenic celllytic cell
- Q Are the following statements true for yeasts, molds, or both?A. Cells contain membrane-enclosed organellesB. Grow preferably at 37CC. Reproduce by sporulationD. UnicellularE. Composed of hyphaeF. Cells reproduce by budding
- Q Where is the most unlikely place in the cell to find a ribosome? Group of answer choices On the exterior surface of a cell's plasma membrane. Free floating in the...
- Q The fluidity of the plasma membrane can be changed by everything except... Group of answer choices ratio of saturated vs monounsaturated phospholipids addition of cholesterol changing the temperature of the...
- Q A frame-shift mutation might generate a....longer proteinshorter proteina protein with many incorrect amino acidsa normal length proteinAny of the above
- Q What happens to a microorganism that is placed at a temperature below the Minimum Growth Temperature?A. The enzymes denature and the microbes dieB. Microorganisms stop growing (i.e. reproducing)C. The enzymatic...
- Q In the stationary phase of the bacterial growth curve...bacteria stop dyingbacteria stop reproducingthe rate of bacterial growth equals the rate of bacterial deathThe rate of bacterial death is higher than...
- Q The temperature at which microbes reproduce the fastest is...37C25C60Cat their optimum growth temperatureat their maximum growth temperature
- Q You are the first scientist to study the signaling pathway that regulates your favorite animal cellbehavior. You discover that phospholipase C, DAG and IP3 are essential components of the signalingpathway.From...
- Q For a body surface to be a respiratory surface, it mustbe thin and moistObe thick and moistbe internalbe dry and covered with hairbe moist and glandular
- Q Which one of the following is not a second messenger? Briefly explain why it isn't considered asecond messenger (you will want to define second messenger during your answer!)Options: Nitric oxide...
- Q Urea isthe primary nitrogenous waste product of most aquatic invertebrates.insoluble in water.more toxic to human cells than ammonia.the primary nitrogenous waste product of most birds.the primary nitrogenous waste product of...
- Q 2. Synthesis of repressible enzyme such as the ones in the tryptophan Operon is stopped by the...A. end product binding to the promoterB. substrate binding to the repressor.C. corepressor binding...
- Q The complement system of blood proteins acts to lyse foreign cells and virusesTrueFalse
- Q Small foreign molecules that are too small by themselves to elicit an immune response may be attached to a host macromolecule to generate an antigenic responseTrueFalse
- Q During fermentation through the ethanol pathway, the NAD+ and acetaldehyde half reactions must be paired. Which statement(s) is are true about this coupled reaction? Explain your reasoning for each answer.A....
- Q Ultraviolet radiation is a type of electromagnetic energy.TrueFalse
- Q You have been hired by a new biotechnology start up and placed in charge of cloning their new "miracle" gene. Describe the steps (in order) you would follow to produce...
- Q Which of these is NOT a use for DNA fingerprinting?A. Match organ donors with recipients in transplant programsB. Differentiating between identical twinsC. Detect bacteria and other organisms that may pollute...
- Q Which objective should you always use to observe bacteria?Scanning objective 4XLow power 10XHigh power 40XOil-immersion objective 100X
- Q What are the interactions involved in each level of structure of proteins?
- Q Which step of the Gram stain is considered to be the most critical?DecolorizerMordantCounterstainPrimary stain
- Q Acid-fast organisms appear__ in color when examined microscopically because they retain the primary dyeblue; methyl bluered; carbolfuschinpurple; crystal violetblue; crystal violetpink; safranin
- Q Would it be acceptable procedure for you to substitute the Gram stain decolorizer for the acid-alcohol decolorizer used in Acid Fast Stain?No because acid-alcohol would decolorize both Gram-positive and Gram-negative...
- Q At which temperature a thermophile organism grows the fastest?At about 90CAt about 60CAt 37CAt about 50CAt about 70C
- Q Which characteristic of SARS-Cov-2--the virus that causes COVID-19-- make it more susceptible to be inactivated by heat?It is Gram-negativeIt evaporates with heatIt is enclosed within a lipid membrane and heat...
- Q You culture an unknown bacteria at 25C and found that they were able to grow at that temperature. How would you classify the bacteria?a. Psychrophileb. Psychrotrophc Mesophilea or b; it...
- Q Gram-negative bacteria are generally more resistant to chemical agents than Gram- positive bacteria because Gram-negative have...the Lipid Aan outer membrane that provides extra protectiona thick peptidoglycan that provides protectiona thin...
- Q Which sentencebelow is anexample of"NarrativeWriting"?A. To create the perfectflavor in your lobsterbisque soup, you will needto purchase teningredients.B. Here is a list of themost successfulcomposers from 1900 tothe present.C. My...
- Q A buffer resists change to Hydrogen or hydroxyl ion increase.TrueFalse
- Q If a positively charged ion is more concentrated outside the cell, the forcesrequired to balance the chemical gradient would be directed________________. Thus,the equilibrium potential for this ion would becharged.outward: negativelyinward:...
- Q Describe what is happening to microbes in a culture tube as they pass through the phases of growth. In which phase, microbes are most sensitive to antibiotics and why?
- Q Match the parts of microscope on the left with the function the rightmagnifies the image 10 timesFocusses light on the specimenControls the amount of lightMoves stage up or down for...
- Q Which statement best describes a cell?A small compartment that includes a cytoplasm, a nucleus, and a cell membrane.A sac-like membrane that stores water.A compartment that contains DNA and regulates when...
- Q The functions of mitochondria include all but1. Regulation of cell death by apoptosis2. Regulation of signaling pathways that using Ca2+ as a messenger3. ATP production and some amino acid synthesis4....
- Q Salivary glands produce a large quantity of enzymes, which are transported out of the secretory cells. Which of the following organelles would be in abundance in these cells?A NucleiB RibosomesC...
- Q A scientist is studying the various prokaryotic and eukaryotic species found floating in a sample of water taken from a marine ecosystem.Which cellular component will be found in the widest...
- Q Which of the following is not part of cell theory?Cells are the basic unit of life in all organisms.All living things come from one or more cells.All cells must be...
- Q Which of the following is NOT a principle of the cell theory?Very few cells are able to reproduce.Cell are the basic unit of life.All living things are made of cells.All...
- Q What is the correct order of the levels of organization in a living thing, starting with the smallest level?a cell to tissue to organ system to organ to organismb organism...
- Q Which of the following is NOT commonly a part of the mechanism of enzyme-based catalysis?metal ionsacidic and/or basic groupspositioning of substratesbondingR group changes
- Q As part of the cell cycle, a cell produces new daughter cells that are identical to the original cell. During which phase are the two daughter cells physically separated?A CytokinesisB...
- Q Writing to Learn: Exploring Your Habits of MindWhat habits of mind do you already possess as you approach this course? To determine this, think about your high school study habits...
- Q Match the following part to its most appropriate function listed below.coarse adjustment knobInitial knob used to focus an image when the scanning or low power objectives are selected4X objective100X objective10X...
- Q Cells may have different shapes and different numbers of organelles, depending on their function. Which features do plant cells have that animal cells lack?A Chloroplast, ribosome, and cell wallB Golgi...
- Q The cytoplasm (Select all that apply)is a viscous gel-like solution that slows rate of diffusion within cellscontains a mixture of soluble ions, metabolites and macromoleculeshas filamentous proteins that make up...
- Q The organelle in most cells that produces a significant quantity of energy (ATP) is the mitochondrion. This organelle has two membranes, the inner of which is highly folded to maximize...
- Q Which of these cell structures is NOT correctly matched to its cellular function?Golgi complex: where membrane vesicles are added around new proteinsmitochondria: where photosynthesis takes placeplasma membrane: selectively allows certain...
- Q "Oh, I go by various names. I am the wild huntsman in some countries; the black miner in others. In this neighbourhood I am known by the name of the...
- Q A cell is placed in a water solution with the same salt concentration as the cell. The cell is placed in ahypotonic solutionhypertonic solutionIsotonic solution
- Q The passively diffuses oxygen and carbon dioxide in and out of the cell.cell wallplasma membranenucleusprotoplasm
- Q Which of the following are not characteristics of the cell wall? Select all that apply.cellulose and chitinhydrophilic and hydrophobic structuresfound in cells of fungi and algaedouble-layered membrane
- Q If a cell was observed under the microscope and found to have a rigid cell wall and be green in color that cell is most likely aAnimal cellPlant cellBacterium cellAlgae...
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