Chapter1: CellularBiology t t t
MULTIPLE CHOICE t
1. Which statement best describes the cellular function of metabolic absorption?
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a. Cells can produce proteins. c. Cells can take in and use nutrients.
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b. Cells can secrete digestive enzymes. d. Cells can synthesize fats.
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ANS: C t
In metabolic absorption, all cells take in and use nutrients and other substances from
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theirsurroundings. The remaining options are not inclusive in their descriptions of cellular
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metabolic absorption.
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2. Most of a cell’s genetic information, including RNA and DNA, is contained in the:
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a. Mitochondria c. Nucleolus
b. Ribosome d. Lysosome
ANS: C t
The nucleus contains the nucleolus, a small dense structure composed largely of RNA, most
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of the cellular DNA, and the DNA-binding proteins, such as the histones, which regulate its
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activity. The other options do not contain most of a cell’s genetic information.
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3. Which component of the cell prodNuUceRsSIhNyGd TroBg. CenO M
t p erox ide (H2O2) by using oxygen to t t t t t t t t t
t remove hydrogen atoms from specific substrates in an oxidative reaction?
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a. Lysosomes c. Ribosomes
b. Peroxisomes d. Oxyhydrosomes
ANS: B t
Peroxisomes are so named because they usually contain enzymes that use oxygen to remove t t t t t t t t t t t t t
hydrogen atoms from specific substrates in an oxidative reaction that produces H2O2, which
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is a powerful oxidant and potentially destructive if it accumulates or escapes from
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peroxisomes. Ribosomes are RNA-protein complexes (nucleoproteins) that are synthesized
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in the nucleolus and secreted into the cytoplasm through pores in the nuclear envelope called
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nuclear pore complexes. Lysosomes are saclike structures that originate from the Golgi
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complex and contain more than 40 digestive enzymes called hydrolases, which catalyze
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bonds in proteins, lipids, nucleic acids, and carbohydrates.
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Oxyhydrosomes areinvolved in enzyme production. ǹ t t t t
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4. Which cell component is capable of cellular autodigestion when it is released during
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t cellinjury?
a. Ribosome c. Smooth endoplasmic reticulum t t
b. Golgi complex t d. Lysosomes
ANS:
tD
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The lysosomal membrane acts as a protective shield between the powerful digestive
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enzymes within the lysosome and the cytoplasm, preventing their leakage into the
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cytoplasmic matrix. Disruption of the membrane by various treatments or cellular injury
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leads to a release of the lysosomal enzymes, which can then react with their specific
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substrates, causing cellular self-digestion. The other options do not correctly describe
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thisprocess.
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5. What is the sequence of steps in the development of a digestive enzyme by the
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t pancreascells from the initial transcription to the release from the cell? t t t t t t t t t t
a. The enzyme is transcribed from DNA by RNA in the nucleus, proceeds to
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the ribosome for synthesis, and is transported in a secretory vesicle to the cell
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membrane. t
b. The enzyme is transcribed from RNA by DNA in the nucleus, proceeds to the
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lysosome for synthesis, and is transported in an encapsulated membrane to the
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cellmembrane.
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c. The enzyme is transcribed by the mitochondria in the nucleus, proceeds to the
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ribosome for synthesis, and is transported in a cytoskeleton to the cell membrane.
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d. The enzyme is transcribed from DNA by RNA in the nucleus, proceeds to the
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Golgi complex for synthesis, and is transported in a cytosol to the cell membrane.
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ANS: A t
The enzyme is transcribed from DNA by RNA in the nucleus, proceeds to the ribosomefor
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synthesis, and is transported in a secretory vesicle to the cell membrane. The other options do
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not correctly describe this process.
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6. During which phase of the cell cycle is DNA synthesized?
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a. G1 c. G2
b. S d. M
ANS: B t
The four designated phases of the cell cycle are: (1) the G1 phase (G = gap), which is the
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period between the M phase (M = mitosis) and the start of DNA synthesis; (2) the S phase(S
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= synthesis), during which DNA is synthesized in the cell nucleus; (3) the G2 phase, during
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which RNA and protein synthesis occurs, the period between the completion of DNA
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synthesis and the next phase (M); and (4) the M phase, which includes nuclear and
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cytoplasmic division.
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7. What organic compound facilitates transportation across cell membranes by acting
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asreceptors, transport channels for electrolytes, and enzymes to drive active pumps?
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a. Lipids c. Proteins
b. Proteases d. Carbohydrates
ANS: C t
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Proteins act as (1) recognition and binding units (receptors) for substances moving in and out
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of the cell; (2) pores or transport channels for various electrically charged particles called
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ions or electrolytes and specific carriers for amino acids and monosaccharides; and
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(3) specific enzymes that drive active pumps that promote the concentration of certainions,
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particularly potassium (K+), within the cell while keeping concentrations of otherions, for
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example, sodium (Na+), below the concentrations found in the extracellular environment.
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The other options do not correctly describe this process.
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8. Understanding the various steps of proteolytic cascades, such as caspase-mediated t t t t t t t t t
apoptosis and complement cascades, may be useful in designing drug therapy for
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whichhuman diseases?
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a. Cardiac and vascular disorders t t t
b. Autoimmune and malignant disorders t t t
c. Gastrointestinal and renal disorders t t t
d. Endocrineand gastrointestinal disorders t t t
ANS: B t
Understanding the various steps involved in this process is crucial for designing drug t t t t t t t t t t t t
interventions. Dysregulation of proteases features prominently in many human
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diseases,including cancer, autoimmunity, and neurodegenerative disorders. The other
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options do not correctly describe this process.
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9. Which structure prevents water-soluble molecules from entering cells across the plasma
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t NURSINGTB.COM
membrane?
a. Carbohydrate chains t c. Membrane channel proteins t t
b. Glycoprotein channels t d. Lipid bilayer t
ANS: D t
The bilayer’s structure accounts for one of the essential functions of the plasma membrane. It
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is impermeable to most water-soluble molecules (molecules that dissolve inwater) because
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the water-soluble molecules are insoluble in the oily core region. The bilayer serves as a
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barrier to the diffusion of water and hydrophilic substances while allowing lipid-soluble
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molecules, such as oxygen (O2) and carbon dioxide (CO2), to diffuse through it readily. The
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other options do not correctly describe this process.
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10. The fluid mosaic model explains:
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a. How a cell membrane functions t t t t
b. Why our bodies appear to be solid t t t t t t
c. How tissue is differentiated t t t
d. How fluid moves between the intracellular and extracellular compartments
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ANS: A t
The fluid mosaic model accounts for the flexibility of cellular membranes, their
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self-sealing properties, and their impermeability to many substances. The
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remainingoptions do not explain the mosaic model.
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11. Which form of cell communication is used to communicate within the cell itself and
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t with other cells in direct physical contact?
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a. Protein channel (gap junction) t t t
b. Plasma membrane–bound signaling molecules (involving receptors)
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c. Hormone secretion such as neurotransmitters t t t t
d. Extracellular chemical messengers such as ligands t t t t t
ANS: A t
Cells communicate by using hundreds of kinds of signal molecules, for example,
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insulin.Cells communicate in three main ways; they display plasma membrane–bound
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signalingmolecules (receptors) that affect the cell itself and other cells in direct physical
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contact. The other options do not correctly describe this process.
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12. Which mode of chemical signaling uses blood to transport communication to cells
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somedistance away?
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a. Paracrine c. Neurotransmitter
b. Autocrine d. Hormonal
ANS: D t
Chemical signaling can be classified into three categories: (1) local-chemical mediator,
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(2)hormone, and (3) neurotransmitter. In the local-chemical mediator model, the secreted
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chemical acts on the cells in the immediate environment. Hormones are used for
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communication with distant t ar getNcUeRl lSsI. NFGoTr Be.xCaOmMpl e , cells can secrete a chemical and
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rely on the blood system to deliver the signal to a distant cell. Finally, neurotransmitters are
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secreted by neurons to stimulate an adjoining cell. For example, a neuron might secrete
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acetylcholine to stimulate the movement of a muscle cell.
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13. Which mode of chemical signaling uses local chemical mediators that are quickly
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t taken up, destroyed, or immobilized?
`n t t t
a. Paracrine c. Neurotransmitter
b. Autocrine d. Hormone
ANS: A t
In paracrine signaling, cells secrete local chemical mediators that are quickly taken
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up, destroyed, or immobilized. The other options do not correctly describe this process.
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14. Neurotransmitters affect the postsynaptic membrane by binding t t t t t t
to:
a. Lipids c. Amphipathiclipids t t
b. Ribosomes d. Receptors
ANS: D t
In each type of chemical signaling, the target cell receives the signal by first attaching toits
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receptors. The other options do not correctly describe this process.
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