What phenomenon accounts for the appearance of chloroplasts in some unicellular phototrophic eukaryotes?
A) endosymbiosis
B) secondary endosymbiosis
C) sequencing of chloroplasts' SSU genes
D) horizontal gene transfer
Answer: B
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A group is considered polyphyletic if
A. all members of the group share a common ancestor. B. not all descendants of the common ancestor are included. C. all members share homoplastic traits. D. the group does not contain the most recent common ancestor. E. it is the most parsimonious grouping.
The primary reason why certain trees tend to grow straight and tall with few lateral branches when compared with other trees is because:
A. of unknown reasons B. Lateral buds are missing in many of these trees C. Lateral bud development is dependent on temperature D. Gibberellins affect the buds detrimentally E. Auxins inhibit lateral bud development
Facilitated transport requires the use of ATP.
a. true b. false
Transcomplementation is a name sometimes given for a test to see whether a gene from one organism can "rescue" a loss-of-function mutant of a different organism with a homologous gene. To which of the following processes might this term apply?
A) replacement of a nonfunctional globin gene with a globin pseudogene B) substitution of a drought-resistant gene from potato plants with a drought-resistant gene from a cactus species C) introduction of a human WEE1 gene into a yeast culture with wee1- mutants D) replacement of a cdc25– with a cdc13+ gene to rescue a cell cycle dysfunction E) use of Drosophila heat shock gene promoters to regulate heat shock genes in fugu