In determining the evolutionary relationships of current species, one needs to ________
A) read along the tree tips: Species closer to each other are always more closely related
B) read along the tree tips: Species shown at the tips are arranged in patterns reflecting which groups evolved from others
C) read "back" to nodes connecting species to determine common ancestry
D) None of the above is an accurate way to read phylogenetic trees.
C
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Hexachlorophene has been particularly effective against
A. Staphylococcus aureus. B. Micrococcus aureus. C. Escherichia coli. D. Enterobacter aerogenes.
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.
Melatonin regulates
a. heart rhythms in song birds. b. the stimulation of cancer cell growth in humans. c. the menstrual cycle in human females. d. sleep cycles in humans. e. milk production in mammals after giving birth.
Cell theory is one of the foundations of biology. What are the tenets of the cell theory? Check all that apply.
A. Cells arise from other cells through the process of cell division. B. Cells carry genetic material passed to daughter cells during cellular division. C. All organisms are made up of more than one cell. D. Organisms are formed through spontaneous generation E. All living organisms consist of cells F. All cells have the ability to move.