Question 1

In studying osteoporosis in humans,you wish to test a newly designed treatment for efficacy.Your best choice for a model organism would be

Accepted Answer

A)  Escherichia coli. 
B)  Mus musculus. 
C)  Caenorhabditis elegans. 
D)  Arabidopsis thaliana. 
E)  Pisum sativum. 
A)  Escherichia coli. 
B)  Mus musculus. 
C)  Caenorhabditis elegans. 
D)  Arabidopsis thaliana. 
E)  Pisum sativum. B

Question 2

Which of the following is an important characteristic for a model organism?

Accepted Answer

A) marginally characterized 
B) difficult to manipulate in the laboratory 
C) prone to random changes that alter primary characteristics 
D) widely studied 
E) all of the above 
A) marginally characterized 
B) difficult to manipulate in the laboratory 
C) prone to random changes that alter primary characteristics 
D) widely studied 
E) all of the above D

Question 3

How does brightfield microscopy allow images to be visualized?

Accepted Answer

A) Specimens are illuminated with white light. 
B) Electrons strike the specimen being examined. 
C) Specimens are fixed and have bright fluorescent molecules attached to them. 
D) Specimens are illuminated with blue light to visualize internal features of cells smaller than 100 nm. 
E) Specimens are viewed under phased light to improve magnification. 
A) Specimens are illuminated with white light. 
B) Electrons strike the specimen being examined. 
C) Specimens are fixed and have bright fluorescent molecules attached to them. 
D) Specimens are illuminated with blue light to visualize internal features of cells smaller than 100 nm. 
E) Specimens are viewed under phased light to improve magnification. A

Question 4

The ________ was developed in the late 1920s by Theodore Svedberg.He originally used it to determine the sedimentation rate of proteins.

Accepted Answer

The answer of The ________ was developed in the late...

Question 5

Jacques Monod and François Jacob deduced the mechanism responsible for the regulation of prokaryotic gene expression.They are,therefore,responsible for launching the era of

Accepted Answer

A) the scientific method. 
B) molecular genetics. 
C) biochemistry. 
D) light microscopy. 
E) radioisotopes. 
A) the scientific method. 
B) molecular genetics. 
C) biochemistry. 
D) light microscopy. 
E) radioisotopes.

Question 6

The steps of the scientific method,in the correct order,are

Accepted Answer

A) design experiments,draw conclusions,collect data,interpret results,make observations,and test the hypothesis. 
B) make observations,formulate the hypothesis,design experiments,collect data,interpret results,and draw conclusions. 
C) collect data,interpret results,test the hypothesis,design experiments,make observations,and draw conclusions. 
D) collect data,interpret results,test the hypothesis,make observations,and design experiments. 
E) none of the above. 
A) design experiments,draw conclusions,collect data,interpret results,make observations,and test the hypothesis. 
B) make observations,formulate the hypothesis,design experiments,collect data,interpret results,and draw conclusions. 
C) collect data,interpret results,test the hypothesis,design experiments,make observations,and draw conclusions. 
D) collect data,interpret results,test the hypothesis,make observations,and design experiments. 
E) none of the above.

Question 7

Which type of microscopy has the greatest resolving power?

Accepted Answer

A) electron microscopy 
B) phase-contrast microscopy 
C) fluorescence microscopy 
D) digital video microscopy 
E) confocal scanning microscopy 
A) electron microscopy 
B) phase-contrast microscopy 
C) fluorescence microscopy 
D) digital video microscopy 
E) confocal scanning microscopy

Question 8

All of the following are model organisms,except

Accepted Answer

A) Saccharomyces cerevisiae. 
B) Drosophila melanogaster. 
C) Caenorhabditis elegans. 
D) Arabidopsis thialana. 
E) Homo sapiens. 
A) Saccharomyces cerevisiae. 
B) Drosophila melanogaster. 
C) Caenorhabditis elegans. 
D) Arabidopsis thialana. 
E) Homo sapiens.

Question 9

The total protein content of the cell is called the ________.

Accepted Answer

The answer of The total protein content of the cell...

Question 10

Which of the following is closest to a micrometer in size?

Accepted Answer

A) the width of a strand of DNA 
B) the length of a plant cell 
C) the length of a chicken egg 
D) a typical prokaryotic cell 
E) the size of a ribosome 
A) the width of a strand of DNA 
B) the length of a plant cell 
C) the length of a chicken egg 
D) a typical prokaryotic cell 
E) the size of a ribosome

Question 11

Which of the following biochemical techniques uses an electrical field to separate macromolecules based on their mobility through a semisolid gel?

Accepted Answer

A) light microscopy. 
B) ultracentrifugation. 
C) chromatography. 
D) electrophoresis. 
E) mass spectrometry. 
A) light microscopy. 
B) ultracentrifugation. 
C) chromatography. 
D) electrophoresis. 
E) mass spectrometry.

Question 12

You are working on a project that involves the direct observation of DNA molecules.The microscope that would give you the best information at this time would be the

Accepted Answer

A) light microscope. 
B) phase-contrast microscope. 
C) transmission electron microscope. 
D) digital video microscope. 
E) fluorescent microscope. 
A) light microscope. 
B) phase-contrast microscope. 
C) transmission electron microscope. 
D) digital video microscope. 
E) fluorescent microscope.

Question 13

A scientist is examining motile protist.He wishes to determine their direction of movement.Which of the following microscopic techniques is least likely to be used to view these cells?

Accepted Answer

A) light microscopy 
B) electron microscopy 
C) differential interference contrast microscopy 
D) fluorescence microscopy 
E) phase-contrast microscopy 
A) light microscopy 
B) electron microscopy 
C) differential interference contrast microscopy 
D) fluorescence microscopy 
E) phase-contrast microscopy

Question 14

A(n)________ is an instrument used to separate subcellular structures and macromolecules on the basis of size,shape,and density.________ developed this instrument in Sweden during the period 1925-1930.

Accepted Answer

ultracentr

Question 15

You wish to obtain a purified sample of mitochondria from lysed cells.The best way to obtain this sample would be

Accepted Answer

A) centrifugation. 
B) chromatography. 
C) polyacrylamide gel electrophoresis. 
D) agarose gel electrophoresis. 
E) both centrifugation and polyacrylamide gel electrophoresis. 
A) centrifugation. 
B) chromatography. 
C) polyacrylamide gel electrophoresis. 
D) agarose gel electrophoresis. 
E) both centrifugation and polyacrylamide gel electrophoresis.

Question 16

Which organelle stores most of the DNA in plant and animal cells?

Accepted Answer

A) Golgi complex 
B) mitochondrion 
C) chloroplast 
D) nucleus 
E) lysosome 
A) Golgi complex 
B) mitochondrion 
C) chloroplast 
D) nucleus 
E) lysosome

Question 17

Which of the following types of light microscopy improves the resolution of thick specimens by illuminating one plane of the specimen at a time?

Accepted Answer

A) fluorescence microscopy 
B) phase-contrast microscopy 
C) confocal microscopy 
D) differential interference contrast microscopy 
E) brightfield microscopy 
A) fluorescence microscopy 
B) phase-contrast microscopy 
C) confocal microscopy 
D) differential interference contrast microscopy 
E) brightfield microscopy

Question 18

Which of the following can only be viewed by electron microscopy?

Accepted Answer

A) frog eggs 
B) DNA 
C) nuclei 
D) mitochondria 
E) prokaryotes 
A) frog eggs 
B) DNA 
C) nuclei 
D) mitochondria 
E) prokaryotes

Question 19

Scanning electron microscopy (SEM)is especially suited to

Accepted Answer

A) observing living specimens. 
B) examining internal cellular structure. 
C) creating a sense of depth. 
D) both observing living specimens and creating a sense of depth. 
E) simultaneously observing living specimens,examining internal cellular structure,and creating a sense of depth. 
A) observing living specimens. 
B) examining internal cellular structure. 
C) creating a sense of depth. 
D) both observing living specimens and creating a sense of depth. 
E) simultaneously observing living specimens,examining internal cellular structure,and creating a sense of depth.

Question 20

The limit of resolution can best be defined as

Accepted Answer

A) the distance that an object must be moved to be distinguished from its background. 
B) the inverse of the wavelength of light; it is greatest for black light. 
C) the distance that two objects must be apart to be distinguished as separate objects. 
D) the solvent that must be available to remix a solution. 
E) the magnification power of a microscope. 
A) the distance that an object must be moved to be distinguished from its background. 
B) the inverse of the wavelength of light; it is greatest for black light. 
C) the distance that two objects must be apart to be distinguished as separate objects. 
D) the solvent that must be available to remix a solution. 
E) the magnification power of a microscope.

Exam 1: A Preview of Cell Biology

In studying osteoporosis in humans,you wish to test a newly designed treatment for efficacy.Your best choice for a model organism would be

Which of the following is an important characteristic for a model organism?

How does brightfield microscopy allow images to be visualized?

The ________ was developed in the late 1920s by Theodore Svedberg.He originally used it to determine the sedimentation rate of proteins.

Jacques Monod and François Jacob deduced the mechanism responsible for the regulation of prokaryotic gene expression.They are,therefore,responsible for launching the era of

The steps of the scientific method,in the correct order,are

Which type of microscopy has the greatest resolving power?

All of the following are model organisms,except

The total protein content of the cell is called the ________.

Which of the following is closest to a micrometer in size?

Which of the following biochemical techniques uses an electrical field to separate macromolecules based on their mobility through a semisolid gel?

You are working on a project that involves the direct observation of DNA molecules.The microscope that would give you the best information at this time would be the

A scientist is examining motile protist.He wishes to determine their direction of movement.Which of the following microscopic techniques is least likely to be used to view these cells?

A(n)________ is an instrument used to separate subcellular structures and macromolecules on the basis of size,shape,and density.________ developed this instrument in Sweden during the period 1925-1930.

You wish to obtain a purified sample of mitochondria from lysed cells.The best way to obtain this sample would be

Which organelle stores most of the DNA in plant and animal cells?

Which of the following types of light microscopy improves the resolution of thick specimens by illuminating one plane of the specimen at a time?

Which of the following can only be viewed by electron microscopy?

Scanning electron microscopy (SEM)is especially suited to

The limit of resolution can best be defined as

The Chemistry of the Cell

The Macromolecules of the Cell

Cells and Organelles

Bioenergetics: the Flow of Energy in the Cell

Enzymes: the Catalysts of Life

Membranes: Their Structure,function,and Chemistry

Transport Across Membranes: Overcoming the Permeability Barrier

Chemotrophic Energy Metabolism: Glycolysis and Fermentation

Chemotrophic Energy Metabolism: Aerobic Respiration

Phototrophic Energy Metabolism: Photosynthesis

The Endomembrane System

Cytoskeletal Systems

Cellular Movement: Motility and Contractility

Beyond the Cell: Cell Adhesions, cell Junctions, and Extracellular Structures

The Structural Basis of Cellular Information: Dna, chromosomes, and the Nucleus

DNA Replication, repair, and Recombination

Gene Expression: Ithe Genetic Code and Transcription

Gene Expression: Iiprotein Synthesis and Sorting

The Regulation of Gene Expression

Molecular Biology Techniques for Cell Biology

Signal Transduction Mechanisms: Ielectrical and Synaptic Signaling in Neurons

Signal Transduction Mechanisms: Iimessengers and Receptors

The Cell Cycle and Mitosis

Sexual Reproduction,meiosis,and Genetic Recombination

Filters

A(n) is an instrument used to separate subcellular structures and macromolecules on the basis of size,shape,and density. developed this instrument in Sweden during the period 1925-1930.