During root nodule development rhizobia penetrate into root cortex cells. Next, proteins called __________ cause root cortex cells to divide, forming nodules.
A. Nod factors
B. Flavonoids
C. Nodulins
D. Leghemoglobin
E. Bacteroids
C. Nodulins
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In response to induction by the optic vesicle,
a. genes coding for crystallin and keratin are activated. b. genes coding for only crystallin are activated. c. genes coding for only keratin are activated. d. genes coding for crystalline and keratin are not activated. e. apoptosis occurs.
What process generates many B cells and T cells that are activated against specific antigens?
A. Clonal expansion B. Antibody production C. Antigen presentation D. Antigen expression E. Opsonization
Which was a possible source of high energy on early Earth that likely contributed to the origin of life?
a. redox energy b. gamma radiation c. volcanic activity d. infrared radiation e. geothermal energy
True or False: For microbial community fingerprinting, T-RFLP often requires the DNA to FIRST be separated with DGGE
a. TRUE b. FALSE