The directional growth response of plants to touch is called
A. phototropism.
B. gravitropism.
C. thigmotropism.
D. photoperiodism.
E. thermotropism.
C. thigmotropism.
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If cells are grown in a medium containing radioactive 35S, which of these molecules will be labeled?
A) phospholipids B) nucleic acids C) proteins D) amylose E) proteins and nucleic acids
One reason organic farming is used is because in contrast to other farming methods certain inorganic fertilizers may be easily:
A. leached from soils B. bound by soil particles C. not useful as minerals at all D. lack the essential minerals needed for plant growth E. too high acid content
What group is represented by all of the bacteria species E. coli living inside a cow's intestine?
A) community B) population C) ecosystem D) demographic transition
Drosophila eggs acquire an initial asymmetry before fertilization as a result of
A. maternal DNA molecules being deposited in one end of the egg. B. nurse cell migration to one end of the egg. C. production of bicoid proteins in one end of the egg. D. attachments of cadherins to one end of the cell. E. maternal mRNA being deposited in one end of the egg.