Which of the following is TRUE about cytokines?
A) They are proteins.
B) They play an important role in immunity.
C) They play a role in the growth of stem cells.
D) They are proteins that play an important role in immunity and the growth of stem cells.
Answer: D
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It is believed that phototrophy arose approximately 3.3 billion years ago in
A) Bacteria. B) Archaea. C) Eukarya. D) LUCA.
A paroxysmal cough is associated with Legionnaires' disease.
Answer the following statement true (T) or false (F)
The renal cortex contains _______, which remove and concentrate wastes to form urine.
a. the nephrons b. the ureter c. the urethra d. plasma
Which of the following species is credited with being the first to use stone tools?
a) Homo sapiens b) Homo erectus c) Homo habilis d) Cro-Magnon e) Australopithecus afarensis