__________ secreted by one plant cell alter the activity of a different cell. Fill in the blank(s) with the appropriate word(s)
Hormones
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At present, the most accurate indicator of evolutionary relatedness among organisms is the
A. size of the periplasmic space. B. sequence of the ribosomal small subunit RNA. C. size of the bacterial chromosome. D. similarities of cell membrane proteins. E. size of the ribosomes.
p53 is often referred to as the “guardian of the genome” by cancer research scientists. According to the diagram, which action by p53 explains its reputation?
a. Mutated p53 results in cancer.
b. p53 can trigger apoptosis.
c. p53 arrests the cell cycle if there is DNA damage.
d. p53 monitors the supply of oxygen in the environment.
Alcids and penguins have had similar adaptations selected despite them being in different groups. What is this an example of?
a. Synchronous evolution b. Convergent evolution c. Concise evolution d. Divergent evolution
Which junction influences the passage of ions and small molecules between cells?
a. gap b. adhering c. loose d. tight e. plasma