Which period was unusually dry, giving seed plants an evolutionary advantage over previously dominant seedless plants?
a. Pennsylvanian
b. Mississippian
c. Permian
d. Devonian
c. Permian
Biology & Microbiology
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Which of the following enzymes are NOT secreted by TH1 to activate macrophages?
A) granulocyte-monocyte colony stimulating factor B) interferon gamma C) TNF-? D) fibrin
Biology & Microbiology
After gastrulation the next event in human
embryo formation is
a. formation of the bones. b. formation of the neural tube. c. the heart begins to beat. d. pharyngeal arches form. e. apotosis between fingers and toes begins.
Biology & Microbiology
Four of the five answers listed below are involved in gene action. Select the exception
a. replication b. transcription c. translation d. polymerization e. base sequence
Biology & Microbiology
DNA and RNA contain functional units known as:
A. fatty acids. B. amino acids. C. peptides. D. enzymes. E. nucleotides.
Biology & Microbiology