What is the name of an extracellular messenger protein that is named for its ability to kill tumor cells and also serves as an apoptotic stimulus?
a) tumor death factor
b) tumor angiogenesis factor
c) tumor necrosis factor
d) tumorigenic factor
e) necromancer factor
Ans: c) tumor necrosis factor
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Unlike members of the Bacteria, most archaeons have linear chromosomes with multiple origins of replication.
Answer the following statement true (T) or false (F)
Why is it critical that the K+ channel activation gate responds slightly more slowly to depolarization than the Na+ channel activation gate?
A. If they showed identical response times, movements of Na+ and K+ ions would cancel out each other's effects on membrane potential changes. B. If they showed identical response times, movements of Na+ and K+ ions would magnify each other's effects on membrane potential changes, creating dangerously large action potentials. C. It is not critical and there would be no change in action potential characteristics if this difference in response time did not exist.
In all animals, the largest percentage of the body's fluids are located in the:
A. intracellular compartment. B. extracellular compartment. C. interstitial fluid. D. plasma. E. hemolymph.
The 5' and 3' designations used in reference to DNA and RNA sequences are assigned to the
A. oxygen atoms contained in the deoxyribose and ribose. B. hydrogen atoms that form hydrogen bonds between the nucleotides. C. nitrogen atoms in the nitrogen bases. D. carbon atoms in the nitrogen base purines and pyrimidines. E. carbon atoms of deoxyribose and ribose.