Which mechanism(s) of obtaining energy and nutrients are only present in bacteria and archaea, but not eukaryotes?
a. photoautotrophs
b. chemoautotrophs
c. photoheterotrophs
d. chemoheterotrophs
e. chemoautotrophs and photoheterotrophs
e
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A scientist crosses two homozygous plants—one with white flowers and one with red flowers. Which of the following characteristics of their offspring indicates incomplete dominance?
a. all pink flowers b. a mix of red and white flowers c. all white flowers d. all red flowers
The area inhabited by all individuals of a particular species is known as the population's
A) geographic range. B) density. C) ecosystem. D) habitat.
A serum titer involves
A. determining the highest dilution of serum that produces a visible reaction. B. the Western blot method. C. quantifying the number of infectious particles in a specimen. D. determining the lowest dilution of serum that produces a visible reaction.
Members of the order Hemiptera (true bugs) go through postembryonic development called incomplete metamorphosis. What are the stages of this process?
a. several instars of often wormlike larvae, followed by a stage where they are a sessile pupa, and then ending in an adult stage that is very different from the larval stages b. a series of nymph instars that lack functional wings, ending with an adult instar with functional wings c. a single, wingless nymph instar followed by several winged adult instars d. a series of young instars that become more and more like an adult, ending with a wingless adult instar