Questions I missed on my exams Flashcards
Which of the following best describes the control of the lac operon?
Negative feedback
Which of the following best describes the control of the cAMP operon?
Positive gene expression
Which regulatory mechanism in bacteria is indicated by the diagram shown here? (precursor to tryptophan image)
Feedback inhibition
In the diagram shown here, what is the role of tryptophan? (precursor to tryptophan image)
Allosteric repressor
The bubble image of DNA replication the little fragments (the small darkened portion of the tail)
This portion of the arrow is where DNA synthesis begins. What is the name of this small portion of the newly replicated section of DNA?
The primer
Using the pattern explained above write the direction indicator of the DNA molecule indicated by point E (the end that is on the same side as the 5 prime.
3 prime end
Write out the name of the functional group that associated with this end of the DNA molecule (same side as the 3 prime end question)
Hydroxyl group
Using the pattern explained above write the direction indicator of the DNA molecule indicated by point F (the end that is on the same side as the 3 prime.
5 prime end
Write out the name of the functional group that associated with this end of the DNA molecule (the 5 prime end)
phosphate group
What is the name of the point where the replication bubble forms?
Origin of replication
Which molecule would be added to the growing strand by the enzyme marked as molecule C in the figure shown on the previous page? (molecule C is DNA polymerase)
Deoxyribose
Which molecule would be added to the growing strand by the enzyme marked as molecule E in the figure shown on the previous page? (molecule E is DNA primase)
Ribose
What specific type of nucleic acid is synthesized by this enzyme? (DNA primase)
RNA
What do we call the short length of nucleic acid synthesized by this enzyme? (DNA primase)
Primer
What happens when a ribosome encounters a stop codon?
A water molecule is added to the chain, causing the chain to terminate and leave the ribosome
In terms of gene 3, which strand is the template strand? (arrow going left the opposite way on the bottom strand)
Strand A
Name the type of mutation that would result if a nucleotide in the original sequence was accidentally deleted.
Frameshift mutation
Which of the following events is most immediately associated with the absorption of energy by chlorophyll molecules of the reaction-center complex?
An electron is excited
ATP is synthesized from energy absorbed
NADPH+ is reduced to NADPH
A molecule of water is split
An electron is excited
Which of the following metabolic process normally occurs in most cells regardless of oxygen availability?
Glycolysis
Oxidation phosphorylation
Fermentation
Citric acid cycle
Glycolysis
A person on a strict diet and exercise regimen lost 7kg of body fat in just 2 weeks. In which of the following forms did the loss of fat most likely leave the body?
Released CO2 and H2O
Eliminated from the body as feces
Converted to heat and then released
Converted to ATP, which weighs much less than fat
Released CO2 and H2O
Where would you expect is the natural environment of enzyme A (associated with PH levels)?
In an acidic environment
In hot environment
In cold environment
In alkaline environment
In an acidic environment
What happen to glucose in glycolysis?
Oxidation
Reduction
Synthesis
combustion
Oxidation
Which of the terms below best describes a regulatory mechanism in which the end product of a metabolic pathway inhibit an enzyme that catalyzes an early step in the pathway?
Feedback inhibition
Cooperation inhibition
Metabolic inhibition
Allosteric inhibition
Feedback inhibition
If the substrate has a positive charge, what properties would you expect to find in the enzyme groove/pocket where the substrate binds?
Negative charge
Non-polar
Polar
Positive charge
Negative charge
Which of the following statements best describe the function of the nuclear pore complex found in the eukaryotic cells?
It regulates the movement of proteins and RNAs into and out of the nucleus
It synthesizes secreted proteins
It assembles ribosomes from f=raw materials that are synthesized in the nucleus
It synthesizes the proteins required to copy DNA and make mRNA
It regulates the movement of proteins and RNAs into and out of the nucleus
Which of the following structures is not associated with the endomembrane system in eukaryotic cells?
Chloroplast
Plasma membrane
Golgi apparatus
Nuclear envelope
Chloroplast
Movement of amoebae across a surface requires which of the following activities by components of the cytoskeleton?
Assembly of actin filaments to form bulges in the plasma membrane
Localized contractions driven by myosin and microtubules
Reinforcement of pseudopod with intermediate filaments
Assembly of microtubule extensions that vesicles can follow in the direction of movement
Assembly of actin filaments to form bulges in the plasma membrane
Certain animal cells normally have well-defined spherical nuclei. Cells with a genetic defect have irregularly nuclei. Which of the following cytoskeletal elements is most likely affected by genetic defect?
Intermediate filaments
Myosin proteins
Microfilaments
microtubules
Intermediate filaments