Gliese 581 is of interest to scientists because it is a ________
a. star of the same type as ours, which may have planets
b. galaxy with a massive black hole in the center
c. nebulae that is birthing new stars
d. planet with an Earth-like mass orbiting a sun like ours
d
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Which of the following events probably made the evolution of cellular respiration possible?
a. Accumulation of carbon dioxide in atmosphere d. Emergence of eukaryotes b. Emergence of prokaryotes e. Emergence of plants c. Accumulation of oxygen in atmosphere
Embryonic development is orchestrated by a cascading series of genes, the expression of many of which are controlled in time and space by transcription factors and effector molecules of various kinds
But what controls the expression of the first regulatory genes to be transcribed in the newly fertilized zygote?
Sponges are believed to have arisen from the choanoflagellates because they possess:a
amebocytes. b. collar cells. c. spongin. d. spicules. e. oscula.
Which mechanism have viroids evolved to stay stable outside host cells?
a. forming a hairpin-shaped double-stranded molecule with closed ends outside cells b. forming a protein capsid outside cells c. forming a protective polysaccharide sheath outside cells d. all of the above