In the root apical meristem, __________ supports division of undifferentiated meristem cells, and cytokinin signals the cells to differentiate.
Fill in the blank(s) with the appropriate word(s).
auxin
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Where would you most likely find an integral membrane protein?
A) on the inside surface of the cell membrane B) on the outside surface of the cell membrane C) floating freely in the cytoplasm D) spanning the cell membrane, with parts of the protein visible from both the inside and the outside of the cell
Metanephridia differ from protonephridia in all of the following ways except:
A. the urine produced in both systems is more dilute than the body fluids. B. metanephridia are surrounded by an extensive capillary network, whereas protonephridia are not. C. selective reabsorption of materials occurs via cells lining the tubules in protonephridia and via capillaries in metanephridia. D. fluid enters metanephridia through a funnel -shaped opening. E. fluid from the body cavity enters protonephridia without first being filtered.
A modification that occurs to a nuclear gene that alters gene expression, but not permanently, is called _______ inheritance
A. extranuclear B. cytoplasmic C. maternal effect D. epigenetic E. nuclear
________, a viral enzyme, is used to convert single-stranded RNA into ___________ for cloning. Fill in the blank(s) with the appropriate word(s)