Variant Creutzfeldt-Jakob disease is caused by errors in ____
a. DNA replication
b. translation
c. transcription
d. protein folding
e. RNA template replication
d
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The theory of chromosomal inheritance was first proposed by
A. Mendel. B. Morgan. C. Knight. D. Sutton. E. Stern.
A graduate student is trying to isolate bacterial mRNA for an enzyme that will degrade trinitrotoluene (TNT)
She's frustrated to find that the enzyme isn't produced when the bacterium in question is grown on nutrient agar. What might she do to solve the problem and obtain the mRNA? A. Add nitrogen and toluene to the agar to drive up synthesis of TNT. B. Add TNT to the agar-this will drive synthesis of the enzyme to degrade it, leading to production of the mRNA the student is looking for. C. Remove glucose from the agar-this will cause the bacteria to shift to other compounds for their energy purposes. D. Remove all sugars from the agar-this will cause the bacteria to shift to other compounds for their energy purposes. E. Add TNT to the agar-this will drive synthesis of the enzyme to degrade it, leading to production of the mRNA the student is looking for AND remove all sugars from the agar-this will cause the bacteria to shift to other compounds for their energy purposes.
Dispersal agents, such as pollen-carrying wind or seed-carrying animals, are responsible for ____ in most plant
populations because they often introduce novel alleles into a population.
a. gene flow b. genetic drift c. mutations d. nonrandom mating e. natural selection
Why are Gram-negative bacteria more resistant than Gram-positive bacteria to damage by certain chemical agents like lysozyme?
A) Gram-negative bacteria contain peptidoglycan in their cell wall. B) Gram-negative bacteria have a thicker layer of peptidoglycan in their cell wall. C) Gram-negative bacteria lack a cell wall. D) Gram-negative bacteria have an outer membrane as part of their cell wall. E) Gram-negative bacteria have porins.