What would result from a single nucleotide deletion (point mutation) within the coding sequence of a structural gene?
A. a silent point mutation with no deleterious effects
B. a missense point mutation resulting in the change of one amino acid
C. a nonsense point mutation resulting in the generation of a premature stop codon
D. a frameshift mutation, producing a different amino acid sequence altogether
E. All of the choices are possible.
D. a frameshift mutation, producing a different amino acid sequence altogether
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If two otherwise dissimilar organisms share similar genomic DNA, it suggests which of the following conclusions?
A. The shared genes are ancient and probably no longer function within the altered physiological states of modern organisms. B. The shared genes have evolved a number of times and have no phylogenetic significance. C. The two taxa are more closely related than formerly believed. D. The shared genes developed early in evolution and are likely to be applicable to a wide diversity of organisms. E. DNA is not a reliable basis for phylogenetic decisions.
What are the problems with cloning as a conservation strategy? Check all that apply.
_____ It often requires finding appropriate surrogate mothers. _____ Populations of cloned individuals grow too quickly. _____ It requires detailed knowledge of species' reproductive biology. _____ It increases genetic diversity of a species beyond natural levels. _____ The root causes of species loss are not addressed by cloning methods.
What does tonoplast refer to?
a. the plant nuclear envelope b. the cell wall c. a chloroplast d. the vacuolar membrane
Why is variegation in four o'clock plants determined by the phenotype of the ovule source?
A) The mitochondria determine the leaf coloration, and the mitochondria are inherited through the ovule. B) Dominant genes demonstrating variegation come from the ovule. C) Recessive genes demonstrating variegation come from the ovule. D) The ovule nuclear genome contains the genes for leaf coloration. E) The chloroplasts determine the leaf coloration, and the chloroplasts are inherited through the ovule.