1.1 The highest magnification generally used to study the ultra-structure of cells is provided by the a. transmission electron microscope. b. compound light microscope. c. phase contrast microscope. d. scanning electron microscope. e. Nomarski process light microscope. 1.2 What factor relating to cells accounts for the larger size of elephants compared to mice? a. size b. composition c. weight d. number e. surface area 1.3 Which of the following are NOT found in any prokaryotic cells? a. ribosomes b. mitochondria c. polysaccharide capsules d. cell walls e. flagella 1.4 The double membrane of a mitochondrion in contrast to the membrane of the nucleus a. is riddled with pores. b. is not permeable. c. creates two compartments. d. separates DNA from cytoplasm. e. has two lipid bilayers. FIFTEEN PAGES - PAGE TWO 1.5 All of the following are found in both plant and animal cells EXCEPT a. nuclei. b. mitochondria. c. Golgi bodies. d. plastids. e. ribosomes. 1.6 Plasmodesmata are cell junctions that are similar in function to a. gap junctions in animal cells. b. tight junctions in animal cells. c. desmosomes in animal cells. d. the cuticle in plant cells. e. stomata in plant cells. 1.7 The pseudopodia of amoebas and certain other cells are produced by the action of a. myosin. b. microtubules. c. intermediate filaments. d. microfilaments. e. G proteins. 1.8 Four of the five structures listed below are composed of membranes. Select the EXCEPTION. a. endoplasmic reticulum b. granum c. plasma membrane d. ribosome e. nuclear envelope 1.9 The relative impermeability of membranes to water-soluble molecules is a result of the a. nonpolar nature of water molecules. b. presence of large integral membrane proteins. c. presence of inorganic salt crystals scattered through some membranes. d. presence of cholesterol in the membranes. e. presence of phospholipids in the lipid bilayer. 1.10 A single-cell freshwater organism is transferred to salt water. Which of the following is likely to happen? a. The cell bursts. b. Salt is pumped out of the cell. c. The cell shrinks. d. Enzymes flow out of the cell. e. The cell does not change shape.
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- The transmission electron microscope (TEM) provides the highest magnification for studying cell ultra-structure. - Answer: a. transmission electron microscope. Show more…
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Which of the following are components of the eukaryotic cell membrane? a) Phospholipids b) Carbohydrates c) Glycolipids d) Cholesterol e) All of the above 2. Which type of transport can move molecules across a cell membrane from an area of lower concentration to an area of higher concentration? a) Diffusion b) Facilitated diffusion c) Active transport d) Osmosis 3. Homeostasis is the ability of a cell to always maintain an imbalance in order to stay active. True False 4. For the following, please explain the tonicity of both the environment and the cell within the said environment: 1. Placing a bacterial cell that normally lives in extreme salty conditions in your glass of water. 2. Placing a freshwater microbe in your glass of water. 3. Placing a freshwater microbe into a salt spring.
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a. DNA b. proteins c. nucleus d. nucleolus e. modify f. digestion g. cellulose h. channels i. vacuoles j. mitochondria k. microtubules 1. rough ER m. smooth ER n. solar energy o. protein fibers p. large vacuole q. Golgi apparatus I. microfilaments s. intermediate filaments t. endomembrane system The (1) is the cell's genetic control center. The nucleus houses the cell's (2) and directs protein synthesis by making messenger RNA. The (3) makes the subunits of ribosomes. Ribosomes synthesize (4) according to the directions from DNA. Many organelles are connected through the (5) (6) synthesizes lipids and processes toxins. (7) manufactures membranes and ribosomes on its surface, produce membranes and secretory proteins. The (8) consists of stacks of sacs that (9) - ER products and then ship them to other organelles or to the cell surface. Lysosomes house enzymes that function in (10) and recycling within the cell. Plant cells contain a (11) that stores molecules ad wastes and facilitates growth. While animal cells have small and numerous (12) that function in the general maintenance of the cell. The organelles of the endomembrane system are interconnected structurally and functionally. (13) is the main organelle in animal cell responsible in harvesting chemical energy from food while chloroplasts in plant convert (14) to chemical energy. The cell's internal skeleton helps organize its structure and activities. The cytoskeleton is a network of (15) (16) of actin enable cells to change shape and move. (17) reinforce the cell and anchor certain organelles. (18) give the cell rigidity and acts as tracks for organelle movement. Plant cell walls are made largely of (19) Plasmodesmata are connecting (20) between plant cells.
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#3. Among the Functions of the cytoplasmic membrane we can count: A. All the Above B. Photosynthesis: All membranes have photosynthetic pigments on foldings called chromatophores C. ATP production: Contains enzymes that produce ATP D. Selective permeability: allows the passage of all molecules. #5. What will happen to a plant cell if placed in a hypertonic solution? A. The cell will become crenated. B. The cell will undergo lysis. C. The cell will swell slightly. D. The cell will undergo plasmolysis. E. The cell will remain unchanged. #11. Which of the following statements regarding the effect of cellular pH are true? A. Intracellular pH is a non-critical factor of the intracellular environment. B. b and c C. Cells can be affected by changes in intracellular pH. D. Cells have developed different mechanisms for regulating intracellular pH. #14 What is required for facilitated diffusion to take place? A. energy from ATP B. a transmembrane protein C. movement down a concentration gradient D. the transport of small nonpolar molecules E. the transport of large food particles #15. In the cell membrane: A. None. B. Its components can be destroyed by antibiotics (polymyxins) or by disinfectants (alcohol, quaternary ammonium compounds). C. Phospholipids move freely for various functions. D. Proteins keep a rigid structure that cannot be changed or moved laterally.
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