915666
Descripción
Test por Christine Sang, actualizado hace más de 1 año
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Creado por Christine Sang
hace casi 10 años
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Pregunta 1
Pregunta
Which of the following is not a characteristic of bacteria:
Respuesta
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Peptidoglycan in the cell wall
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Protein synthesis inhibited by diptheria toxin
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Protein synthesis inhibited by chloramphenicol
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DNA exists in nucleoids
Pregunta 2
Pregunta
A ribozyme is...
Respuesta
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an enzyme that degrades RNA
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involves in synthesizing primers for DNA replication
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required for RNA polymerase activity
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an RNA that has enzymatic activity
Pregunta 3
Pregunta
Which of the following bacterial components is made of DNA?
Respuesta
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ribosomes
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plasmids
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lysosomes
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chromatophores
Pregunta 4
Pregunta
Which is a function of the smooth endoplasmic reticulum?
Respuesta
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modify proteins for export
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synthesize phospholipids
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detoxify drugs
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digest fatty acids
Pregunta 5
Pregunta
80s ribosomes are assembled in the:
Respuesta
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nucleotide
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nucleoid
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nucleolus
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nuclear lamina
Pregunta 6
Pregunta
A Gram-positive bacterial cell may have:
Respuesta
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two phosphlipid bilayers
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two peptidoglycan regions
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LPS
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flagella
Pregunta 7
Pregunta
Which would you not find in a prokaryotic cell?
Respuesta
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spliceosomes
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ribosomal RNA
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RNA primases
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aminoacyl-tRNA synthetases
Pregunta 8
Pregunta
Peripheral membrane proteins are:
Respuesta
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not essential for the cell's existence
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found only on the outer surface of the cell
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attached to biological membranes through interactions with integral membrane proteins
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often found to form pumps that move ions through membranes
Pregunta 9
Pregunta
Which of the following is an example of a protein's secondary structure?
Respuesta
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alpha helixes
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hydrophobic interactions
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amino acid sequence
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nucleotide sequence
Pregunta 10
Pregunta
Which molecule does not contain glucose?
Respuesta
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starch
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cellulose
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sucrose
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fructose
Pregunta 11
Pregunta
The function of the glycogen is:
Respuesta
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provide structure within the cell
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provide structure outside of the cell
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allow movement of the cell
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provide energy storage for the cell
Pregunta 12
Pregunta
Which of the following is NOT a polysaccharide?
Respuesta
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Glycogen
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Starch
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Galactose
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Chitin
Pregunta 13
Pregunta
If an enzyme solution is saturated with substrate, the most effective way to obtain an even faster yield of products is to:
Respuesta
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Add more of the enzyme
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Heat the solution to 90 degrees C
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Add more substrate
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Add an allosteric inhibitor
Pregunta 14
Pregunta
An enzyme accelerates a metabolic reaction by
Respuesta
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altering the overall free-energy change for the reaction
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making an endergonic reaction occur spontaneously
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lowering the activation energy
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pushing the reaction away from equilibrium
Pregunta 15
Pregunta
Which of the following is not associated with allosteric regulation of an enzyme's activity?
Respuesta
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A molecule mimics the substrate and competes for the active site
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A naturally occurring molecule stabilizes a catalytically active conformation
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regulatory molecules bind to a site remote from the active site
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Inhibitor and activator molecules may compete with one another
Pregunta 16
Pregunta
A scientist purified a protein from animal cells and made fluorescent antibodies to it. When she isolated pieces of the plasma membrane from another batch of aniaml cells and added the fluorescent antibodies, she could see fluorescence on both sides of the membrane. She tried to isolate the protein from the membranes but could not do so without destroying the membranes. The protein was probably...
Respuesta
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a peripheral protein
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a farnesyl-anchored protein
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a transmembrane protein
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a cytosolic protein
Pregunta 17
Pregunta
Which statement is false?
Respuesta
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Plant cells undergo plasmlysis when they are places in a hypertonic solution
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The cell wall prevents plant cells from bursting when they are places in a hypotonic solution
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Animal cells shrink in size when they are placed in hypertonic solution
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An animal cell place in a 1M solution of sucrose, or a 1M solution of isopropanol, will shrink.
Pregunta 18
Pregunta
Which of the following is NOT true of the sodium/potassium pump of animal cells?
Respuesta
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it undergoes conformational changes
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it uses the energy from ATP
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it creates a membrane potential
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it serves as an example of a secondary active transport system
Pregunta 19
Pregunta
Bacteria and Archaea have different? Check all that apply.
Respuesta
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ribosomes
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cell walls
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lipids
Pregunta 20
Pregunta
Cyanide prevents electrons from leaving the ETC.
Respuesta
- True
- False
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