Phylogenetic trees are organized into groups that share a homologous trait. What are these groups called?
a. bipolar
b. monophyletic
c. polymorphous
d. evolutionary
b. monophyletic
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How do nastic movements differ from tropisms?
A. Nastic movements are slower than tropisms. B. Nastic movements only occur in the dark. C. Tropisms are directional responses to directional stimuli; nastic movements are the same regardless of the direction of the stimulus. D. Nastic movements happen after a stimulus, tropisms happen during a stimulus. E. Nastic movements are not reversible.
Give two examples of fluid
What will be an ideal response?
If ATP synthase had a mutation in the F1 complex portion of the protein, which function of ATP synthase would most likely be affected?
A. The flow of protons through the channel B. The rotation of the rotor C. The insertion of the enzyme into the membrane D. The conversion of ADP and Pi to ATP
A population of T cells was stimulated to proliferate in response to a particular antigen. A sample of 1000 stimulated cells was analyzed by fluorescence-activated cell sorting (FACS) for total DNA content
Of the 1000 cells, 400 had a 2n amount of DNA, 200 had a 4n amount of DNA, and the remaining 400 cells had between a 2n and 4n amount of DNA. Additional immunofluorescence analysis revealed that 200 of the cells were in various stages of M phase and that M phase lasted 2 hours. What is the total length of the cell cycle? A) 8 hours B) 12 hours C) 18 hours D) 20 hours E) 24 hours