Which of the following infects only plants?
A. Virus
B. Prion
C. Viroid
D. Capsid
Answer: C
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If a horticulturist breeding gardenias succeeds in having a single plant with a particularly desirable set of traits, which of the following would be her most probable and efficient route to establishing a line of such plants?
A) Backtrack through her previous experiments to obtain another plant with the same traits. B) Breed this plant with another plant with much weaker traits. C) Clone the plant. D) Force the plant to self-pollinate to obtain an identical one. E) Add nitrogen to the soil of the offspring of this plant so the desired traits continue.
Nitrogen is important in the mutualism between legume plants and Rhizobium bacteria
Indicate whether the statement is true or false
You compare homologous nucleotide sequences among several pairs of species with known divergence times. A pair of species that diverged 1 million years ago has two nucleotide differences, a pair that diverged 2 million years ago has four nucleotide
differences, and a pair that diverged 3 million years ago has six nucleotide differences. You have sequence data for another pair of species for which the divergence time is unknown. There are five nucleotide differences between them. Based on your clock, when did their line of ancestry diverge? A) 3.5 million years ago B) 3 million years ago C) 2.5 million years ago D) 2 million years ago
Morphogen distribution inside a cell
A. is homogeneous. B. can arise due to localized secretion by neighboring cells and occur prior to fertilization. C. can be established prior to fertilization of the oocyte. D. can arise due to localized secretion by neighboring cells. E. is dependent on CAMs.