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Chapter 1. The Cell as a Unit of Health and Disease
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1 The nucleus
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function andsurvival of the cell.
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A) is the site of protein synthesis gg gg gg gg gg
B) contains the genetic code gg gg gg
C) transforms cellular energy gg gg
D) initiates aerobic metabolism gg gg
2 Although energy is not made in mitochondria, they are
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knownas the power plants of the cell because they:
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A) contain RNAfor protein synthesis. gg g gg gg
B) utilize glycolysis for oxidative energy.
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C) extract energy from organic compounds.
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D) store calcium bonds for muscle contractions.
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3 Although the basic structure of the cell plasma
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membrane isformed by a lipid bilayer, most of the
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specific membrane functions are carried out by:
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A) bound and transmembrane proteins. gg gg gg
B) complex, long carbohydrate chains. gg gg gg
C) surface antigens and hormone receptors.
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D) a gating system of selective ion channels.
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4 To effectively relay signals, cell-to-cell
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communicationutilizes chemical messenger systems
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that:
A) displace surface receptor proteins. gg gg gg
B) accumulate within cell gap junctions. gg gg gg gg
C) bind to contractile microfilaments.
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D) release secretions into extracellular fluid.
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,5 Aerobic metabolism, also known as oxidative
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metabolism,provides energy by:
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A) removing the phosphate bonds fromATP. gg gg gg gg g
B) combining hydrogen and oxygen to gg gg gg gg
formwater.
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C) activating pyruvate stored in the cytoplasm.
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D) breaking down glucose to form lactic acid.
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6 Exocytosis, the reverse of endocytosis, is important in
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into the extracellular fluid.
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A) Engulfing and ingesting fluid and proteins gg gg gg gg gg
fortransport n
B) Killing, degrading, and dissolving gg gg gg
harmfulmicroorganisms gg
C) Removing cellular debris and gg gg gg
releasingsynthesized substances n gg
D) Destruction of particles by lysosomal nn nn gg gg
enzymes for secretion
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7 The process responsible for generating and
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conductingmembrane potentials is:
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A) diffusion of current-carrying ions. gg gg gg
B) millivoltage of electrical potential. gg gg gg
C) polarization of charged particles. gg gg gg
D) ion channel neurotransmission.
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8 Epithelial tissues are classified according to the shape of
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thecells and the number of layers. Which of the following
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is a correctly matched description and type of epithelial
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tissue?
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A) Simple epithelium: cells in contact with gg gg gg gg gg
intercellular matrix; some do not extend
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to surface gg n
, B) Stratified epithelium: single layer of cells;
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all cells rest on basement membrane
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C) Glandular epithelium: arise from surface gg gg gg gg
epithelia and underlying connective tissue
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D) Pseudostratified epithelium: multiple layers gg gg gg
ofcells; deepest layer rests on basement
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membrane
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9 Connective tissue contains fibroblasts that are responsible
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for:
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A) providing a fibrous framework for capillaries. gg gg gg gg gg
B) synthesis of collagen, elastin, and gg gg gg nn
reticularfibers.
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C) forming tendons and the fascia that gg gg gg gg gg
covers muscles. n
D) filling spaces between tissues to keep organs
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inplace.
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10 Although all muscle tissue cells have some similarities,
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smooth muscle (also known as involuntary muscle)
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differs by:
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A) having dense bodies attached to gg gg gg gg
actinfilaments. gg
B) containing sarcomeres between Z lines and gg gg gg gg gg
Mbands.
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C) having rapid contractions and abundant
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cross-striations. n
D) contracting in response to gg gg gg
increasedintracellular calcium.
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11 Which of the following aspects of the function of the
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nucleus is performed by ribosomal RNA (rRNA)?
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A) Copying and carrying DNAinstructions gg gg gg g
for protein synthesis gg n gg