Gierer and Schramm isolated ______ from tobacco mosaic virus and applied it to plant tissue, which caused the same types of lesions that occurred when plants were exposed to intact tobacco mosaic virus
A. RNA
B. DNA
C. proteins
D. capsids
A
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Which of the following statements is true regarding the lowest level of a trophic pyramid (that is, the pyramid base)?
A. It contains the greatest amount of energy. B. It contains the greatest amount of carbon. C. It has the largest biomass of all the trophic levels. D. It is often comprised of phytoplankton (if in aquatic environments). E. All of these statements about the lowest level of a trophic pyramid are true.
You see a red, tubular flower with no distinct scent. It is likely pollinated by a _______
A. bird B. bat C. bee D. rodent E. beetle
What is the main purpose of the extracellular matrix surrounding osteocytes?
a) Cell growth b) Cell division c) Bone repair d) Bone strength
Which of the following pairs correctly matches the adrenal gland zone, or area, with the class of hormones it produces?
A) zona glomerulosa: mineralocorticoids B) medulla: glucocorticoids C) zona fasciculata: catecholemines D) zona reticularis: aldosterone