Which of the following hormones promotes cell elongation in stems?
A) auxin
B) cytokinin
C) ethylene
D) gibberellin
A
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A microbiologist is attempting to determine the size of a microbial population and has employed several methods. She noticed that the direct count she obtained using a counting chamber and microscope was much higher than her estimate from doing a viable plate count. This discrepancy was encountered during multiple trials. What is the most likely reason for the discrepancy?
A. She counted incorrectly. B. She did not correctly do the serial dilutions prior to the viable plate count. C. The medium and growth conditions used for the viable count will not support the growth of the organisms. D. Many of the organisms viewed during the direct count may be dead. E. The organisms were not readily cultured on the viable count, either because many were dead or because the medium and growth conditions used for the viable count will not support the growth of the microorganism.
Land plants form a ____ clade descended from a common ____ ancestor
a. polyphyletic; green algal b. polyphyletic; fungal c. monophyletic; green algal d. monophyletic; brown algal e. monophyletic; fungal
________ is a measure of the randomness or disorder of a system.
A. Free energy B. Enthalpy C. Entropy D. Synergy
The scientific name of humans is Homo sapiens. What is the species of humans?
A. Homo B. sapiens C. Homo sapiens D. Animalia E. Eukarya