Due to reproductive isolation, a new species of weaver bird is evolving. Is it likely to use a social or solitary nesting strategy?
A. It depends on whether it lives in the forest or the open savanna.
B. It depends on whether it lives in near water or near the desert.
C. It depends on how many eggs it lays.
D. It depends on how many similar species it is competing with.
Answer: A
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The relationship between Trichonympha protozoa and its termite host, and Xenorhabdus bacteria and its nematode host, are both obligatory relationships.
Answer the following statement true (T) or false (F)
Vectors can transfer ____
a. DNA sequences into bacterial host cells for cloning b. DNA sequences into viral host cells for cloning c. cloned viral cells into a bacterial host for cloning d. cloned mitochondria from donor cell to host cell e. cloned chromosomes from the nucleus of a cell into its cytoplasm
In nature, bacteria
A. often grow in close association with many other kinds of organisms. B. may remain in a prolonged exponential phase. C. frequently synthesize structures such as slime layers. D. may adhere to surfaces by means of pili and slime layers. E. All of the choices are correct.
You are a botanist who is immersed in your attempt to increase a certain property in your plant of study. To that end, you induce a mutation that doubles the amount of vascular cambium (a type of meristem) in your plant. Assuming this brings the desired effect, what exactly was the property that you sought to increase?
A. Production of new growth at the tip of stems. B. Production of secondary xylem and phloem. C. Production of only xylem to make wood. D. Production of bark only. E. Production of new leaves.