Carl Woese is BEST known for discovering that ________
A) eukaryote membrane-bound organelles are descended from endosymbionts
B) the oldest fossils are 3.4 billion years old
C) prokaryotes comprise two very different branches: Bacteria and Archaea
D) energy acting on gases and water vapor will create a "primordial soup" of organic molecules
E) the last universal common ancestor (LUCA) did not have DNA-dependent RNA polymerase
C
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Biological membranes contain bilayers containing mostly ______.
A. oils B. prostaglandins C. triglycerides D. cholesterol E. phospholipids
How does a cell surface receptor respond to the binding of a signaling molecule?
a. The cell surface receptor denatures. b. The signal is transduced through the plasma membrane and into the cell. c. The receptor relays a signal to another location on the cell surface. d. The cell surface receptor flips through the membrane to the inside of the cell. e. Polarization of the cell surface changes.
If a cell had a chromosome number of four,
after anaphase but before the cytoplasm divides, how many chromosomes does the cell have?
a. 2 b. 4 c. 8 d. 16 e. none of these
Which organisms obtain heat primarily from internal physiological sources?
a. allotherms b. ectotherms c. exotherms d. endotherms