Which of the following is not a characteristic of bacteria:
Peptidoglycan in the cell wall
Protein synthesis inhibited by diptheria toxin
Protein synthesis inhibited by chloramphenicol
DNA exists in nucleoids
A ribozyme is...
an enzyme that degrades RNA
involves in synthesizing primers for DNA replication
required for RNA polymerase activity
an RNA that has enzymatic activity
Which of the following bacterial components is made of DNA?
Which is a function of the smooth endoplasmic reticulum?
modify proteins for export
digest fatty acids
80s ribosomes are assembled in the:
A Gram-positive bacterial cell may have:
two phosphlipid bilayers
two peptidoglycan regions
Which would you not find in a prokaryotic cell?
Peripheral membrane proteins are:
not essential for the cell's existence
found only on the outer surface of the cell
attached to biological membranes through interactions with integral membrane proteins
often found to form pumps that move ions through membranes
Which of the following is an example of a protein's secondary structure?
amino acid sequence
Which molecule does not contain glucose?
The function of the glycogen is:
provide structure within the cell
provide structure outside of the cell
allow movement of the cell
provide energy storage for the cell
Which of the following is NOT a polysaccharide?
If an enzyme solution is saturated with substrate, the most effective way to obtain an even faster yield of products is to:
Add more of the enzyme
Heat the solution to 90 degrees C
Add more substrate
Add an allosteric inhibitor
An enzyme accelerates a metabolic reaction by
altering the overall free-energy change for the reaction
making an endergonic reaction occur spontaneously
lowering the activation energy
pushing the reaction away from equilibrium
Which of the following is not associated with allosteric regulation of an enzyme's activity?
A molecule mimics the substrate and competes for the active site
A naturally occurring molecule stabilizes a catalytically active conformation
regulatory molecules bind to a site remote from the active site
Inhibitor and activator molecules may compete with one another
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...
a peripheral protein
a farnesyl-anchored protein
a transmembrane protein
a cytosolic protein
Which statement is false?
Plant cells undergo plasmlysis when they are places in a hypertonic solution
The cell wall prevents plant cells from bursting when they are places in a hypotonic solution
Animal cells shrink in size when they are placed in hypertonic solution
An animal cell place in a 1M solution of sucrose, or a 1M solution of isopropanol, will shrink.
Which of the following is NOT true of the sodium/potassium pump of animal cells?
it undergoes conformational changes
it uses the energy from ATP
it creates a membrane potential
it serves as an example of a secondary active transport system
Bacteria and Archaea have different? Check all that apply.