What cycle does a female dog undergo, and what does the cycle lack?
a. an estrous cycle, which lacks ovulation
b. an estrous cycle, which lacks menstruation
c. a menstrual cycle, which lacks ovulation
d. a menstrual cycle, which lacks implantation
Ans: b. an estrous cycle, which lacks menstruation
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Where would it be best to isolate bacteria from to study the mechanism of the sodium motive force?
A) human gut B) hot springs C) soda lakes D) volcanoes
Biogeochemical cycles should be regarded
A) primarily within a terrestrial ecosystem. B) primarily within an oceanic ecosystem. C) primarily linking terrestrial and oceanic ecosystems. D) with a global perspective.
Scientists can fill in gaps in defining species by DNA sequence analysis.
a. true b. false
A piece of DNA that is self-replicating and is used to carry desired genes into new cells is called a(n)
a. library. b. clone. c. vector. d. intron