Stromatolites are rocklike columns composed of:
a. protists
b. dinoflagellates
c. microbial biofilms
d. heterotrophic organisms
e. photosynthetic eukaryotes
c
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Chemical evolution concentrated the various smaller molecules into the more stable forms
a. True b. False Indicate whether the statement is true or false
In humoral immunity, cells that are produced by activated B cells and function by secreting antibodies are called
A. cytotoxic T cells. B. helper T cells. C. plasma cells. D. macrophages. E. memory cells.
There are _____ microbial cells living on and in our bodies compared to the number of our body cells
a. ten times more b. ten times less c. about the same number of d. about half as many e. 100 times more
A second messenger, such as cyclic AMP, carries a hormonal signal to molecules inside a cell
Indicate whether the statement is true or false