Which hormone is used to promote ripening of fruit that has been picked green?
1.auxins
2.cytokinins
3.ethylene
4.gibberellins
3
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The major advantage of using artificial chromosomes such as bacterial artificial chromosomes (BACs) for cloning genes is that _____
A) plasmids are unable to replicate in cells B) only one copy of a plasmid can be present in any given cell, whereas many copies of a BAC can coexist in a single cell C) BACs can carry much larger DNA fragments than ordinary plasmids can D) BACs can be used to express proteins encoded by inserted genes, but plasmids cannot E) BACs are double-stranded, whereas plasmids are single-stranded
Bioluminescence is:
A. emission of flashes of light by organisms B. capture of moonlight for nocturnal photosynthesis C. light absorbed by other pigments and transferred to chlorophyll a D. the fluorescing of Gram-positive bacteria E. none of the other choices provided
A seed is a _____
a. female gametophyte c. mature pollen grain b. mature ovule d. modified microspore
The hypothesis that moderate frequencies of disturbance result in the highest species diversity is called the ________ disturbance hypothesis
Fill in the blank(s) with correct word