What would result from a single nucleotide deletion (point mutation) within the coding sequence of a structural gene?
A. a missense point mutation resulting in the change of one amino acid
B. a frameshift mutation, producing a different amino acid sequence altogether
C. a silent point mutation with no deleterious effects
D. a nonsense point mutation resulting in the generation of a premature stop codon
E. All of the choices are possible.
Answer: B
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The E. coli chromosome is
A) linear. B) circular. C) single-stranded. D) less than a megabase in length. E) compartmentalized within an intracellular membrane.
Identify and describe three beneficial impacts of fire on certain ecosystems. What will be an ideal response?
Which of the following is not a characteristic of osmosis?
a) Water flows from an area of low solute concentration to an area of high solute concentration. b) It occurs across a membrane freely permeable to water. c) It occurs across a membrane freely permeable to solutes. d) It is a passive process.
Electron microscopy of metaphase chromosomes demonstrated various degrees of coiling. What was the name of the model that depicted this process?
A) double-stranded B) packing C) condensation D) chromatid folding E) folded-fiber