As the electron transport carriers shuttle electrons, they actively pump _____ into the outer membrane compartment setting up a concentration gradient called the proton motive force.
A) Phosphate
B) NADH
C) ATP
D) Hydrogen ions
E) Oxygen
D) Hydrogen ions
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What is an estrous cycle?
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Some scientists speculate that a gradual climate change led to the mass extinction of dinosaurs. Which of the following statements supports this theory?
A) Large amounts of water vapor were released into the atmosphere, causing long periods of rain that cooled the planet. B) Asteroids from space collided with Earth, heating the surface of the planet. C) Particles released into the air after an asteroid collision prevented the sun's rays from hitting Earth's surface, thereby causing a decline in photosynthesis. D) Magma released from volcanic eruptions increased the temperature of Earth's crust.
A cherry blossom has all four sets of modified leaves (sepals, petals, stamens, and carpels), so it is called a __________ flower.
Fill in the blank(s) with the appropriate word(s).
Compare and contrast the life-forms found in Domains Bacteria, Archaea, and Eukarya
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