Transposable elements make up ________ of the human genome.
Fill in the blank(s) with the appropriate word(s).
45%
Transposable elements make up 45% of the human genome.
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Under what circumstances does membrane transport require energy?
A) wherever large molecules are moved within a cell B) whenever a solute is moved against its electrochemical gradient C) whenever an ion moves through a phospholipid bilayer membrane D) whenever oxygen moves through a phospholipid bilayer membrane
Balanced polymorphism explains why carriers of cystic fibrosis are relatively resistant to
A) malaria. B) tuberculosis. C) diarrheal illness. D) pneumonia.
_____ are signaling molecules that travel through the blood to target cells
a. Hormones c. Local signaling molecules b. Neurotransmitters d. all of these
Scientists studying a group of related bird species on an island archipelago discover that these species are always more closely related to each other within an island than they are between any two islands. The most likely explanation for this result is that
A. many ancestral bird species colonized each island. B. each bird species evolved different adaptations in allopatry and then colonized the other islands. C. one bird species colonized each island and then evolved into distinct species on that island through character displacement. D. each bird species became reproductively isolated by living on a different island, then later colonized the other islands and acquired new adaptations.