Bio302 Exam 2 Actual Exam Questions
and Answers A+ Graded (2025)
A .neuron .and .white .blood .cell .have .different .functions .because .- .CORRECT
.ANSWER-The .neuron .expresses .some .mRNAs .that .the .white .blood .cell .does .not
Photobleaching .techniques, .such .as .FRAP, .can .be .used .to .measure .the .rate .of
.lateral .diffusion .of .a .membrane .protein .- .CORRECT .ANSWER-True
The .trypotophan .operator .binds .to .the .tryptophan .repressor .when .the .repressor
.is .bound .to .tryptophan .- .CORRECT .ANSWER-True
Pumps .are .transporters .that .are .able .to .harness .energy .provided .by .other
.components .in .the .cells .to .drive .the .movement .of .solutes .across .membranes,
.against .their .concentration .gradient. .This .type .of .transport .is .called .- .CORRECT
.ANSWER-Active .transport
Which .of .the .following .methods .is .not .used .by .cells .to .regulate .the .amount .of .a
.protein .in .a .cell? .- .CORRECT .ANSWER-Nuclear .pore .complexes .can .regulate
.the .speed .at .which .newly .synthesized .proteins .are .exported .from .the .nucleus
.into .the .cytoplasm
Transporters .in .contrast .to .channel .work .by .- .CORRECT .ANSWER-Specific
.binding .to .solutes
In .the .photosynthetic .archean .halobacterium, .a .membrane .transport .protein
.celled .bacteriohodopsin .captures .energy .from .sunlight .and .pumps .protons .out
.of .the .cell→ .trapped .to .generate .ATP .- .CORRECT .ANSWER-The .absorption .of
.sunglight .triggers .a .shift .in .the .conformation .of .the .proteins .seven .membrane,
.spanning .alpha .helices, .allowing .a .proton .to .leave .a .cell
Some .cells .have .aquaporins .to .facilitate .the .flow .of .water. .What .regulates .the
.rate .and .direction .of .water .diffusion .across .the .membrane? .- .CORRECT
.ANSWER-Solute .concentrations .on .either . side .of .the .membrane
Porin .proteins .from .large, .barrel-like .channels .in .the .membrane. .Which .is .NOT
.true .about .their .channels .- .CORRECT .ANSWER-They .are .made .primarily .of
.alpha .helices
, There .are .two .properties .of .phospholipids .that .affect .how .tightly .they .pack
.together: .the .length .of .the .hydrocarbon .chain .and .the . number .of .double .bonds.
.The .degree .of .packing, .in .turn, .influences .the .relative .mobility .of .these
.molecules .in .the .membrane. .Which .of .the .following .would .yield .the .most .highly
.mobile .phospholipid .(listed .as .number .of . carbons .and .number .of .double .bonds,
.respectively)? .- .CORRECT .ANSWER-15 .carbons .and .2 .double .bonds
Figure .11-14 .- .CORRECT .ANSWER-Lateral .Diffusion, .Flexion, .Rotation
Which .of .the .following .statements .about .the .lac .operon .is .false? .- .CORRECT
.ANSWER-The .lac .repressor .binds .when .lactose .is .present .in .the .cell
The .extent .of .complementary .of .miRNA .with .its .target .mRNA .determines .-
.CORRECT .ANSWER-Whether .or .not .the .mRNA .will .be .degraded
Membrane .proteins .can .move .laterally. .Which .type .of .protein .is .expected .to .be
.the .least .movable? .- .CORRECT .ANSWER-Anchors
Plasma .membranes .are .extremely .thin .and .fragile, .requiring .an .extensive
.support .network .of .fibrous .proteins. .This .network .is .called .the .- .CORRECT
.ANSWER-Cell .cortex
Which .of .the .following .statements .about .DNA .methylation .in .eukaryotes .is
.false? .- .CORRECT .ANSWER-Methylation . of .DNA .attracts .proteins .that .initiate
.gene .expressions
The .human .genome .encodes .about .24,000 .genes. .Approximately .how .many
.genes .does .the .typical .differentiated .human .cell .express .at .any .one .time? .-
.CORRECT .ANSWER-Between .5,000 .and .15,000
Consider .the .apical .location .of .a .particular .protein .expressed .in .epithelial .cells,
.illustrated .in .Figure .4A. .Which .type .of .defect .is .most .likely .to .cause .the
.redistribution .of .that .protein .around .the .entire .cell, .show .in .Figure .4B?
A: .A .nonfunctional .protein .glycosylase
B: .The .deletion .of .a .junctional .protein
C: .The .truncation .of .a .protein .found .in .the .extracellular .matrix
D: .A .nonfunctional .flippase .- .CORRECT .ANSWER-The .deletion .of .junctional
.protein
Combinatorial .control .of .gene .expression .____.
A: .Involves .every .gene .using .a .different .combination .of .transcriptional
.regulators .for .its .proper .expression
and Answers A+ Graded (2025)
A .neuron .and .white .blood .cell .have .different .functions .because .- .CORRECT
.ANSWER-The .neuron .expresses .some .mRNAs .that .the .white .blood .cell .does .not
Photobleaching .techniques, .such .as .FRAP, .can .be .used .to .measure .the .rate .of
.lateral .diffusion .of .a .membrane .protein .- .CORRECT .ANSWER-True
The .trypotophan .operator .binds .to .the .tryptophan .repressor .when .the .repressor
.is .bound .to .tryptophan .- .CORRECT .ANSWER-True
Pumps .are .transporters .that .are .able .to .harness .energy .provided .by .other
.components .in .the .cells .to .drive .the .movement .of .solutes .across .membranes,
.against .their .concentration .gradient. .This .type .of .transport .is .called .- .CORRECT
.ANSWER-Active .transport
Which .of .the .following .methods .is .not .used .by .cells .to .regulate .the .amount .of .a
.protein .in .a .cell? .- .CORRECT .ANSWER-Nuclear .pore .complexes .can .regulate
.the .speed .at .which .newly .synthesized .proteins .are .exported .from .the .nucleus
.into .the .cytoplasm
Transporters .in .contrast .to .channel .work .by .- .CORRECT .ANSWER-Specific
.binding .to .solutes
In .the .photosynthetic .archean .halobacterium, .a .membrane .transport .protein
.celled .bacteriohodopsin .captures .energy .from .sunlight .and .pumps .protons .out
.of .the .cell→ .trapped .to .generate .ATP .- .CORRECT .ANSWER-The .absorption .of
.sunglight .triggers .a .shift .in .the .conformation .of .the .proteins .seven .membrane,
.spanning .alpha .helices, .allowing .a .proton .to .leave .a .cell
Some .cells .have .aquaporins .to .facilitate .the .flow .of .water. .What .regulates .the
.rate .and .direction .of .water .diffusion .across .the .membrane? .- .CORRECT
.ANSWER-Solute .concentrations .on .either . side .of .the .membrane
Porin .proteins .from .large, .barrel-like .channels .in .the .membrane. .Which .is .NOT
.true .about .their .channels .- .CORRECT .ANSWER-They .are .made .primarily .of
.alpha .helices
, There .are .two .properties .of .phospholipids .that .affect .how .tightly .they .pack
.together: .the .length .of .the .hydrocarbon .chain .and .the . number .of .double .bonds.
.The .degree .of .packing, .in .turn, .influences .the .relative .mobility .of .these
.molecules .in .the .membrane. .Which .of .the .following .would .yield .the .most .highly
.mobile .phospholipid .(listed .as .number .of . carbons .and .number .of .double .bonds,
.respectively)? .- .CORRECT .ANSWER-15 .carbons .and .2 .double .bonds
Figure .11-14 .- .CORRECT .ANSWER-Lateral .Diffusion, .Flexion, .Rotation
Which .of .the .following .statements .about .the .lac .operon .is .false? .- .CORRECT
.ANSWER-The .lac .repressor .binds .when .lactose .is .present .in .the .cell
The .extent .of .complementary .of .miRNA .with .its .target .mRNA .determines .-
.CORRECT .ANSWER-Whether .or .not .the .mRNA .will .be .degraded
Membrane .proteins .can .move .laterally. .Which .type .of .protein .is .expected .to .be
.the .least .movable? .- .CORRECT .ANSWER-Anchors
Plasma .membranes .are .extremely .thin .and .fragile, .requiring .an .extensive
.support .network .of .fibrous .proteins. .This .network .is .called .the .- .CORRECT
.ANSWER-Cell .cortex
Which .of .the .following .statements .about .DNA .methylation .in .eukaryotes .is
.false? .- .CORRECT .ANSWER-Methylation . of .DNA .attracts .proteins .that .initiate
.gene .expressions
The .human .genome .encodes .about .24,000 .genes. .Approximately .how .many
.genes .does .the .typical .differentiated .human .cell .express .at .any .one .time? .-
.CORRECT .ANSWER-Between .5,000 .and .15,000
Consider .the .apical .location .of .a .particular .protein .expressed .in .epithelial .cells,
.illustrated .in .Figure .4A. .Which .type .of .defect .is .most .likely .to .cause .the
.redistribution .of .that .protein .around .the .entire .cell, .show .in .Figure .4B?
A: .A .nonfunctional .protein .glycosylase
B: .The .deletion .of .a .junctional .protein
C: .The .truncation .of .a .protein .found .in .the .extracellular .matrix
D: .A .nonfunctional .flippase .- .CORRECT .ANSWER-The .deletion .of .junctional
.protein
Combinatorial .control .of .gene .expression .____.
A: .Involves .every .gene .using .a .different .combination .of .transcriptional
.regulators .for .its .proper .expression
