The main visual pigment in rods is:
a. anthocyanin
b. chlorophyll
c. hemoglobin
d. rhodopsin
e. xanthophyll
d
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In gymnosperms, which of the following structures or cell types would be considered spores? Select all correct choices
A. pollen precursor cells in the pollen cones B. mature pollen in the pollen cones C. seeds with the potential to germinate D. egg precursor cells in the ovule cones E. mature eggs in the ovule cones
Disturbances:
A. involve interactions such as competition and predation. B. affect populations differently according to their density. C. usually only affect one particular species in a community. D. are extremely rare. E. can influence the diversity of a species in a community.
In many signaling pathways, once a signlaing molecules binds to a receptos, the receptor becomes phosphorylated. This initial phosphorylation step BEST demonstrates...
a) either cellular response or singal transduction b) cellular response c) signal transduction d) receptor activation e) termination
Which statement is false with regard to adult cell cloning?
A. It involves differentiated cells. B. It occurs with some frequency in nature. C. It involves rewinding the developmental clock. D. It involves an egg cell that has had its nucleus removed. E. It may involve nuclear transfer.