During the initiation of nitrogen-fixation nodules, how do the Rhizobium bacteria enter into the cortex of the root?
A. through the plasmadesmata of the root hairs
B. using proton pumps
C. by repeated cell divisions
D. via the apoplastic pathway
E. through a membrane tube called an infection thread
Answer: E
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Why does a replication fork have a leading and lagging strand?
A. Both answer choices of DNA synthesis proceeding from 5' to 3', and DNA polymerase acting on the 3' end, are correct. B. DNA synthesis always goes from 3' to 5'. C. DNA synthesis always goes from 5' to 3'. D. DNA synthesis can grow off of either the 3' or 5' end. E. DNA polymerase only attaches nucleotides to the 3' end of strands.
Persons with asymptomatic infections may be (contaminants/reservoirs/zoonoses) of disease
What will be an ideal response?
________ is a plant hormone that causes the dormancy of many seeds.
A. Auxin B. Abscisic acid C. Gibberellin D. Cytokinin
Viruses and bacteria were first cultured in the laboratory at about the same time.
Answer the following statement true (T) or false (F)