Which hormone promotes the abscission of leaves and fruits?
A) auxin
B) ethylene
C) cytokinin
D) gibberellin
B
You might also like to view...
2. An epithelial tissue formed by more than one layer of cells and with column-like cells at the surface is called
(a) simple squamous. (b) stratified squamous. (c) simple columnar. (d) stratified columnar.
Which of the following bacterial hosts would should be used to avoid degradation of DNA that is introduced via a cloning vector?
A. Escherchia coli RecA mutants B. Saccharomyces cerevisiae wild type cells C. Escherichia coli that lack endonucleases D. RecA-expressing Escherchia coli
One of the reasons that pufferfish are a good species to compare to humans is because
A. it is so easy to hybridize the two and investigate the consequences. B. they are so distantly related that it's easy to distinguish mutually conserved sequences. C. the introns are often identical. D. of the rapid response time in pufferfish to artificial selection. E. they have been separated for so many millions of years and yet the gene sequence is almost identical.
Ovaries, the female gonads, produce eggs and secrete __________ and __________. Fill in the blank(s) with the appropriate word(s)