In the plant kingdom, all of the species are descended from a single common ancestor. In terms of phylogeny, what type of tree of life is this?
a) uniphyletic
b) allopatric
c) sympatric
d) monophyletic
e) punctuated
Ans: d) monophyletic
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The DNA of a bacterial cell must be compacted about _______ fold to fit within the confines of the cell
A. 10 B. 100 C. 150 D. 1000 E. 1,000,000
You turn on the shower and check the water temperature with your hand. Your brain is able to monitor increasing temperature because the thermosensitive neurons in your skin
A. transmit action potentials to different brain regions as the water warms up. B. transmit bigger action potentials to the brain as the water warms up. C. gradually adapt to the stimulus. D. transmit action potentials at a greater rate when the water warms up. E. integrate temperature information.
In the first step of signal transduction, what is the trigger for the cellular response?
a. target protein b. kinase c. ligand d. second messenger e. effector
Seedless vascular plants include all of the following EXCEPT
A. Psilotum-Pteridophytes. B. Sphagnum-Bryophyta. C. whisk ferns-Psilotophyta. D. horsetails-Sphenophyta.