Definitions of Symbiosis
What will be an ideal response?
•In the mid 1800s, the term was coined by Anton De Bary - literally "living together".
•Often defined by interaction outcome: originally included the full range of interactions.
•In 20th century, definition changed to focus on mutually beneficial interactions.
•Other parts of a definition: timing - transient vs. life-long; necessity - facultative vs. obligate; specificity - narrow vs. broad; location - inside (endo) vs. outside (ecto).
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Match the experimental technique with information obtained
A) 3D visualization of motor movement along a filament B) kinesin 1 step size C) whether a microtubule or microfilament motor protein is responsible for cell activity D) how much force is generated by a motor protein 1) optical laser trapping (tweezers) 2) Atomic Force Microscopy (AFM) 3) fluorescent spot tracking 4) drug inhibition of ATPase activity
Muscles occur in antagonistic pairs because:a
they are incapable of working agonistically. b. actin and myosin filaments can only move in one direction. c. both contraction and extension would cause an oxygen debt. d. contraction is voluntary, while relaxation is involuntary. e. they are only capable of contracting and not pushing.
Bacteria have an average generation time of 24 hours.
Answer the following statement true (T) or false (F)
The four most abundant elements in living organisms are:
A) carbon, hydrogen, potassium, and oxygen. B) hydrogen, nitrogen, carbon, and silicon. C) carbon, nitrogen, hydrogen, and calcium. D) hydrogen, nitrogen, oxygen, and carbon. E) carbon, hydrogen, nitrogen, and phosphorus.