Protobionts are thought to be the first nonliving structures that evolved into living cells. A critical characteristic of a protobiont that is found in both modern day prokaryotes and eukaryotes is
A. internal compartments that subdivide metabolic functions.
B. a boundary membrane that separates external from internal environments.
C. the ability to exclude all organic substances.
D. the ability to fuse with any other protobiont for reproduction.
E. the ability to recognize other protobionts for developmental purposes.
B. a boundary membrane that separates external from internal environments.
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The Protosotomia include (select all that apply)
A. annelid worms B. mollulsks C. sea anemones D. arthropods E. chordates
All the body fluid located outside of cells is
a. interstitial fluid. b. plasma. c. intracellular fluid. d. extracellular fluid.
What enables competitive inhibitors to bind to a specific enzyme?
a. Competitive inhibitors have structures that resemble the enzyme's substrate. b. Competitive inhibitors have unique sugars that are attracted to the enzyme. c. Competitive inhibitors cover the entire surface of an enzyme. d. Competitive inhibitors form unique covalent bonds with enzyme structures.
Axons of motor neurons first leave the spinal cord through the:
A) ventral roots. B) dorsal root ganglion. C) spinal nerve. D) dorsal roots.