Carbon is such an important element for life because it:
A) does not form isomers.
B) forms strong ionic bonds.
C) is part of the water molecule.
D) can form chemical bonds with a maximum of four other atoms.
E) can hydrogen bond to many different molecules.
Answer: D
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Choose the true statements about the diversity of Darwin's finches on the Galápagos Islands. Check all that apply.
_____ All of the finch species share a common ancestor that colonized the islands. _____ Prior to the adaptive radiation of finches, there were no unoccupied habitats in the Galápagos Islands. _____ Competition among finches for food sources led to character displacement of beak shapes. _____ Beak shape is not an important key innovation.
Thyroid hormone is to amphibian metamorphosis as ________ is to insect molting.
A. estogen B. aldosterone C. ecdysone D. cortisol E. butterfly peptide
Balanced polymorphism in a population is likely the result of
a. disruptive selection. b. sexual selection. c. directional selection. d. reproductive isolation. e. stabilizing selection.
What makes phospholipid membranes good at keeping some molecules out, and allowing others to freely pass?
a. They are positively charged. b. They are completely hydrophobic. c. They are completely hydrophilic. d. They have both hydrophilic and hydrophobic regions.