The conducting cells in phloem are
A. sieve tube elements.
B. vessel elements.
C. stomata.
D. tracheids.
E. companion cells.
A. sieve tube elements.
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All three domains (Bacteria, Archaea, and Eukarya) follow the same genetic code. Therefore, which of the following statements would most likely be correct?
A) The genetic code evolved three times. B) The genetic code evolved before DNA replaced RNA as the unit of genetic information. C) There were no mutations following the evolution of the genetic code. D) The genetic code evolved before the different domains diverged.
Which of the following is the correct order of plant adaptations, from oldest adaptation to youngest adaptation?
A. Flowers, seeds, vascular tissue B. Seeds, flowers, vascular tissue C. Vascular tissue, flowers, seeds D. Vascular tissue, seeds, flowers
In a stimulated muscle fiber, the calcium ions released by the sarcoplasmic reticulum bind to the protein ________.
A. actin B. troponin C. myosin D. tropomyosin
Why can measles virus and poxvirus infect many human tissues and influenza virus can infect only one type of tissue? What will be an ideal response?