Micro Chapter 3 - Cell Structure And Function

24 July 2022
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Where is the genetic information of the cell stored?
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nucleus
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The structural framework in a cell is the
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cytoskeleton.
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Where in a cell is ATP made?
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mitochondria
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What carries instructions for making proteins from the nucleus into the cytoplasm?
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mRNA
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One of the ways smooth endoplasmic reticulum (ER) differs from rough endoplasmic reticulum is that rough ER is covered by
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ribosomes.
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Which of the following is part of the endomembrane system?
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Golgi apparatus
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Which of the following organelles breaks down worn-out organelles?
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lysosomes
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Where are lipids made in the cell?
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smooth endoplasmic reticulum (ER)
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What structure acts as a selective barrier, regulating the traffic of materials into and out of the cell?
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plasma membrane
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Which of the following is NOT a basic process of life?
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sexual reproduction
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The filament and basal body are associated with which of the following external structures found in some bacterial cells?
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flagella
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Which of the following is NOT a membranous organelle within a eukaryotic cell?
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ribosome
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The process of bringing a solid substance into the cell is known as __________.
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phagocytosis
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Which of the following would NOT be found in the cytoplasm of a bacterial cell?
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porins
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Which of the following would contain teichoic acids?
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a Gram-positive cell wall
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Which of the following is NOT a component of eukaryotic cell walls?
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sterols
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In a hypotonic environment, the vacuole of a plant cell enlarges and pushes the cytoplasm against the cell wall. Which organelles are most likely able to store that extra water?
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vacuoles
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Which of the following is NOT a characteristic of a eukaryotic cell?
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can undergo transcription and translation simultaneously
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The archaea are similar to bacteria in all of the following aspects EXCEPT __________.
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their ribosomal proteins
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A bacterial cell stains positive with the acid-fast stain. Which of the following is FALSE?
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It has a cell wall that contains endotoxin.
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A bacterial cell is placed in distilled water. Which of the following will happen?
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The cell will gain water.
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A bacterial cell possesses a glycocalyx. Which of the following is FALSE?
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It will be engulfed more quickly by defensive cells of the host.
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If a eukaryotic cell suffers damage to its mitochondria, which of the following processes of life would be most immediately affected?
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energy production
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Which of the following would NOT be expected to be present in a biochemical analysis of an archaeal cell?
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peptidoglycan
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Peptidoglycans are composed of sugars and _____.
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amino acids
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One chain of alternating NAGs and NAMs is connected to another chain via _____.
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tetrapeptides
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One of the main differences between a Gram-positive and a Gram-negative bacterial cell wall is that the peptidoglycan portion of a Gram-positive cell wall is _____ as compared to a Gram-negative cell wall.
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thicker
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Within the peptidoglycan layer, the crossbridges that connect the chains of alternating sugar molecules extend between _____.
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two N-acetylmuramic acid molecules
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The peptidoglycan cell wall of bacteria is most analogous to _____.
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a chain-link fence
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What role do the teichoic acids play within the cell wall of Gram-positive bacteria?
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They serve to stabilize the cell wall and hold it in place.
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The region between the outer and inner membranes of a Gram-negative bacterial cell is known as the __________, and it is the location of enzymes that assemble peptidoglycan.
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periplasmic space
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A patient is infected with Gram-negative bacteria and is experiencing only mild symptoms. When the patient is given an antibiotic causing lysis of the bacterial cells, he suddenly experiences an increase in inflammation and fever, as well as the formation of blood clots. What explanation best describes what happened?
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The lysis of the cells releases lipid A from the lipopolysaccharide layer.
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Which of the following statements about bacterial flagella is true?
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Flagella can rotate 360 degrees.
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Taxis is
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movement towards or away from a stimulus.
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Which of the following terms refers to a bacterium moving towards a light source?
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Positive phototaxis
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As a bacterium approaches a food source, one would expect
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runs to become more frequent.
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Why are receptors on the cell surface necessary for bacterial movement?
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The receptors sense the stimulus and send signals to the flagella.
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What makes phospholipid membranes good at keeping some molecules out, and allowing others to freely pass?
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They have both hydrophilic and hydrophobic regions.
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Integral proteins are mostly involved in
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transport function.
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How does water enter and exit a cell?
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By simple diffusion or by use of an integral transport protein
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A glycoprotein
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is a type of peripheral protein above that can be used as a receptor or in enzymatic functions.
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Which of the following scenarios is an example of bacterial motility?
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A bacterium moving towards a food source
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Axial filaments are found on
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spirochetes.
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How do axial filaments differ from regular bacterial flagella?
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The axial filament is located between the cell membrane and the outer membrane.
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What is the advantage to spirochetes of the corkscrew movement provided by axial filaments?
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It allows the cells to move more easily through viscous human tissues and fluids, such as mucus.
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Axial filaments are composed of
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endoflagella.
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Why is ATP necessary for active transport?
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ATP provides energy to transfer material against its concentration gradient.
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Which type of active transport protein moves two molecules into the cell at the same time?
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Symport
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Which transport protein employs transporters that move molecules only in one direction?
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Uniport and Symport
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Which molecule shown in the animation, the square or the circle, is moving against its concentration gradient?
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Both the circle and the square
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Which type of active transport protein uses one protein to pump two different molecules?
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Antiport and Symport
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Why is no energy required in passive transport?
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The concentration gradient drives the movement.
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Once equilibrium is reached,
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molecules move, but there is no net movement in a particular direction.
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Which of the following would not move freely across the cytoplasmic membrane?
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Positively charged hydrogen ions
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Which of the following molecules could move easily through a lipid bilayer?
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Fatty acid
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The eukaryotic cytoskeleton is composed of all of the following except __________.
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enzymes
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Thiomargarita namibiensis is a notable microbe for which of the following reasons?
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It is the largest prokaryotic microbe ever discovered.
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Which of the following is the cell's principal short-term, recyclable energy source?
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ATP
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Which of the following types of lipids helps keep eukaryotic cell membranes flexible at low temperatures?
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Sterols
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Which of the following is an organelle found in both prokaryotic and eukaryotic cells?
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Ribosome
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Crenation, the shriveling of cells due to loss of water, occurs when cells are placed in what kind of solution?
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Hypertonic
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Passive transport of molecules across the cell membrane that requires specific channel proteins is called __________.
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Facilitated diffusion
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Which of the following would not be found in an inclusion?
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DNA
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Which of the following organelles is present in both prokaryotic and eukaryotic cells?
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Ribosomes
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Which of the following kinds of molecules would be expected to cross the cytoplasmic membrane by diffusion alone?
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Small, lipid-soluble molecules
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All of the following statements are true of archaeal flagella except:
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Archaeal flagella route from the flow of hydrogen ions across a membrane.
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Which of the following eukaryotic cell wall types is incorrectly matched?
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Animal cell: silica
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In this chapter, you will learn about an idea called the "endosymbiotic theory." By calling this idea a theory, scientists mean that it __________.
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has been tested extensively or is supported by many observations
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Hami are proteinaceous structures found in which of the following?
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Archaea
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Which of the following components of the bacterial cell wall is found in varying amounts in both Gram-positive and Gram-negative cells?
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Peptidoglycan
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Which of the following organelles is involved in producing and transporting proteins throughout the cell?
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Rough endoplasmic reticulum
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The endosymbiotic theory is one possible explanation for the origin of which of the following organelles?
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Mitochondria
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Which of the following has not yet been discovered in the archaea?
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Pili
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All of the following are differences between bacterial flagella and eurkaryotic flagella except that __________.
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bacterial flagella move in a wave motion whereas eukaryotic flagella rotate 360 degrees
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Which of the following is not a component of peptidoglycan?
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Lipid A
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The structures that permit bacteria such as Treponema pallidum to "corkscrew" through a medium are called __________.
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endoflagella
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Which of the following is not a primary function of fimbriae?
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Movement toward chemicals or light