Z-form DNA is a ________ helix with ________ backbone.
A) right-handed; a smooth
B) left-handed; a smooth
C) right-handed; an irregular
D) left-handed; an irregular
C) right-handed; an irregular
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Prokaryotes have ________S ribosomes with ________S and ________S subunits, whereas eukaryotes have ________S ribosomes with ________S and ________S subunits.
A) 80, 50, 30; 100, 60, 40 B) 100, 60, 50; 90, 60, 40 C) 70, 50, 30; 80, 60, 40 D) 70, 40, 30; 80, 50, 30 E) 80, 60, 40; 70, 50, 30
What is the ratio of the energy content of food consumed to the energy content of food available?
a. ecological efficiency b. harvesting efficiency c. production efficiency d. assimilation efficiency e. net primary productivity
Which of the following best describes processes that take place during cell communication to produce a cellular response?
A) A series of changes takes place in relay molecules through a signal transduction pathway.
B) Local regulators convert electrical signals to chemical signals to cause movement in a cell.
C) Signaling molecules detect changes in a cell's environment and trigger hormone release.
D) Transduction causes signaling molecules to bind to receptors on the surface of a cell.
What are the four functions of the skeletal system?
What will be an ideal response?