Xylem are hollow vessels produced from dead cells.
True or False?
True
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What would happen to a person who was poisoned with a chemical that blocks the production of neurotransmitters at neuromuscular junctions?
A) The muscles would be unable to contract. B) The person's muscles would contract uncontrollably. C) The sarcoplasmic reticulum would release sodium ions instead of calcium ions. D) The muscles would swell.
Antibiotics are effective because they block ribosomes from functioning. Therefore, within the bacteria these antibiotics will:
What will be an ideal response?
Suppose an antibody to bindin and sea urchin sperm were mixed together and the mixture was added to eggs. You predict that the antibody-treated sperm will _____
A) fertilize the eggs normally B) fertilize eggs from other species C) not bind to the egg membrane D) not be able to swim toward the egg
Which of the following statements about muscle proteins is false?
A. Actin filaments have globular heads. B. Thick filaments consist of parallel bundles of myosin molecules. C. Tropomyosin lies in a groove formed by the actin helices. D. Titin connects myosin filaments to the Z disc. E. Z discs are protein backbones that mark the boundaries of sarcomeres.