The optimum condition for an enzyme
is 60°C.
is where it works best.
cannot be determined.
room temperature.
All of these answers are true.
is where it works best.
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Which of the following is an unusual event that occurs as trichomes differentiate?
a. DNA replication b. endoduplication c. cell expansion d. mitosis e. regulation of the cell cycle
Plant hormones generally ____ concentrations to be effective, and usually have ____ on different plant tissues
a. are effective only in extremely large; the same effect b. require only low; different effects c. require only low; the same effect d. are effective only in extremely large; different effects e. require moderate; the same effect
In addition to the deposit feeding brittle stars pictured, what other type of organism is abundant in this photograph?
1.sea cucumbers
2.urchins
3.bivalves
4.sea stars
Suppose that some cells are grown in culture in the presence of radioactive nucleotides for many generations so that both strands of every DNA molecule include radioactive nucleotides. The cells are then placed in new medium with nucleotides that are not radioactive so that newly synthesized DNA will not be radioactive. What percentage of DNA molecules will contain radioactivity after 2 rounds of replication?
a) 0% b) 25% c) 50% d) 75% e) 100%