Multiple Choice: On a scantron mark the letter corresponding to the best answer

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Multiple Choice: On a scantron mark the letter corresponding to the best answer from the given options. 1. What are the three important principles of microscopy? A. reduction, contrast and magnification C. resolution, contrast and magnification cel hatonation, resolution and contrast 2. In the fractionation of homogenized cells using differential centrifugation, which of the following will require the greatest speed to form pellets at the bottom of the tube? A. ribosomes B. mitochondria D. nuclei 3. Which of the following is a major difference between prokaryotic cels and eukaryotic cells? A Prokaryotic cells contain more nucleic acid (ONA) than eukaryotic cells. B. Prokaryotes are not able to carry out aerobic respiration, relying instead on anaerobic metabolism. C Eukaryotic cells have membrane bound organeles and prokaryotic cells do not. D. Prokaryotes are generally larger than eukaryotes. 4. Which of the folowing limits cell size? B. the number of mitochondria in the cytoplasm A. the volume of the endomembrane system C. the absence of nucleus D. surface area to volume ratio What model describes the current understanding of membrane structure? A. fluid mosaic model 5. B. amphipathic model C liquid model D. hydrophobic model 6. Which of the following is the most common pathway taken by a newly synthesized protein that will be secreted by a cel? Arough ER Golgi transport vesicle nucleus B. Golgi rough ER lysosome transport veside-plasma metrae C. rough ER lysosome transport vesicle plasma mentne D. rough ER Golgi transport vesicle plasma membrane 7. Without a cytoskeleton, eukaryotic cells would NOT B. have an efficient way to transport materials from one organelle to another. A. synthesize protein. C. have an efficient means of metabolism. D. synthesize nucleic acids. 8. All of the following are part of a prokaryotic cel EXCEPT A. DNA B. an endoplasmic reticulum C. rbosomes D. a plasma membrane Which of the flowing is NOT evidence in support of the endosymbiotic thery, the belief that a eukayotic c a "committee" of prokaryotic cells? 9. has evolved as A Mitochondria and chloroplasts are similar in size and structure to some species of bacteria. B. The ribosomes of chloroplasts and mitochondria are similar to bacteria. C. Mitochondria and chiloroplasts can actively break away from eukaryotic cells and live on their own D. Mitochondria and chloroplasts have their own DNA separate from the eukaryotic nucleus 10. Inside the nucleus, DNA is organized into discrete units called A. histones C porins D. nucleoids 11. Which organelles carry out protein synthesis? A. vacuoles C. ribosomes D. microtubules 12. Which structure is not a part of the cytoskeleton? A. intermediate filaments B. C. D. 13. Which organelle often takes up much of the volume of a plant cell? 14. Which type of cell junction presses cells together, preventing leakage of extracellular fluid? 15. Which organelle is the primary site of ATP synthesis in eukaryotic cells? A. lysosome B. Golgi apparatus C. central vacuole D. A. gap junctions C. loose junctions D. tight junctions A. mitochondrion B. lysosome C. Golgi apparatus D. peroxisome

Explanation / Answer

1.      C) Resolution, contrast and magnification: Resolution of microscope is to distinguish between two points on a specimen that can be visible to observer or image system as two separate points. Contrast in microscope is to show lighter and darker regions as an effect of density of different region in specimen. Magnification is enlargement of image size so it can be easily available in visible range.

2.      A) Ribosomes will be requiring highest speed as its smallest cell organelle of the cell and will be needing more speed and more time to settle down during centrifugation.

3.      C) Eukaryotes have membrane bound organelles such as nucleus, mitochondria, chloroplast etc. whereas prokaryotes do not have.

4.      C) Absence of nucleus: Nucleus is the largest and important cell organelle and taking most of cell’s space, that’s why its absence can limits the cell size.

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