Which of the following happens during contraction of a skeletal muscle?
1.The myosin strands get shorter.
2.The concentration of Ca2+ in the cytosol of the muscle fiber decreases.
3.Troponin attaches to myosin.
4.The z lines get closer to each other, shortening the sarcomere.
4
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Nitrogen fixation:
A. is necessary for the electron-transport chain because nitrogen acts as the final electron acceptor. B. incorporates molecular nitrogen (N2) taken from the air into amino acids and nucleotides. C. releases N2 gas to the atmosphere. D. converts N2 to ammonia, making it available for incorporation into amino acids and nucleotides. E. is carried out by biochemical pathways in the plant cells.
Darwin's book in which he described his views on evolution is:
A. Principles of Geology. B. Survival of the Fittest. C. On the Origin of Species. D. On the Principle of Population.
The conversion of solar energy to chemical
energy is known as a. metabolism. b. photosynthesis. c. chemosynthesis. d. catabolism. e. anabolism.
Which of the following biomolecules are long polymers of repeating monomers?
A) polysaccharides B) nucleic acids C) proteins D) lipids E) polysaccharides, nucleic acids, and proteins