Leaf abscission is initiated and orchestrated by changing levels of the plant hormone __________
a. ethylene
b. cytokinin
c. auxin
d. abscisic acid
e. gibberellin
A
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What is the function of the cell wall?
A. To provide the stiffness needed B. To help maintain the shape of the cell C. To provide protection for the cell D. All of the above are functions of the cell wall
Plants generally must use which of the following methods of phosphorus uptake?
A. nonenergy transport B. transport control by soil moisture C. passive uptake D. ATP proton cotransport E. None of these are true
The secondary level of protein structure involves
A. folding of the primary structure upon itself. B. the number of peptide bonds in a polypeptide chain. C. substitutions in the amino acid sequence. D. interactions with other polypeptide chains. E. none of these.
Please refer to the following figure. A researcher discovers a new bacteria whose genome is ~8 Mb in size. What type of bacteria is this likely to be?
a. free-living b. obligate c. obligate symbiont d. any of the above e. cannot be determined with the information provided