Nutrient transport requires energy because the nutrients must be transported into the cell against a concentration gradient. The energy required for nutrient transport is supplied by
A) ATP.
B) the proton motive force.
C) phosphoenol pyruvate.
D) ATP, the proton motive force, or phosphoenol pyruvate.
Answer: A
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Which of the following is in the correct order from smallest to largest structures?
a. myosin head, sarcomere, myofibril, muscle fiber b. sarcomere, myosin head, muscle fiber, myofibril c. myofibril, myosin head, sarcomere, muscle fiber d. muscle fiber, sarcomere, myofibril, myosin head
Water enters the water vascular system of echinoderms through the:
a. spines. b. mouth. c. madreporite. d. tubercle. e. tube feet.
As natural selection acts on a trait in a population, how will the amount of variation associated with that trait in the population change?
A) Variation will decrease. B) Variation will increase. C) Variation will remain the same. D) Variation will disappear altogether.
Pasteur chose the Latin root word for "virus" meaning
A. non-living. B. particle. C. poison. D. contagious. E. extremely small.