The type of selection most likely to act on a well-adapted population in a relatively constant environment is
A) directional. B) artificial. C) stabilizing. D) nonrandom. E) disruptive.
C
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Gram-negative cell walls have an outer membrane that contains lipids and peptidoglycans
____________________ Indicate whether the statement is true or false.
One of the first steps in obtaining a kayrotype is treating cells wiht a drug that stalls cells in mitosis. Why must cells arrest in mitosis for karyotype analysis?
A.) only in mitosis are homologous chromosomes paired up B.) only mitotic chromosomes are highly condensed and visible with a light microscope C.) only mitotic cells contain homologous chromosomes, because mitosis happens after DNA D.) only mitotic chromosome DNA is separated into single strands, allowing for stained by dyes
Which of the following best describes the tree of life as currently understood from analysis of DNA sequence data?
a. The tree of life consists of three domains: Bacteria, Archaea, and Eukarya. b. The base of the tree of life is still uncertain because the molecular clock is not accurate for evolutionary events that occurred that long ago. c. The tree of life consists of three domains—Bacteria, Archaea, and Eukarya—and there was substantial horizontal gene transfer between different organisms during the early history of life. d. The domain Archaea is known to be the first branch; domains Bacteria and Eukarya are more closely related to each other. e. There was substantial horizontal gene transfer between different organisms during the early history of life.
A biogeochemical cycle involves only the abiotic components of an ecosystem, and describes how chemicals circulate through those components.
Answer the following statement true (T) or false (F)