Why is it beneficial to plants that soil particles have negatively-charged surfaces?
A. Negatively-charged ions are pushed towards the roots.
B. Toxic metals are trapped and kept away from the plants.
C. It helps maintain the water potential of the soil.
D. They capture negatively-charged ions.
E. They attract positively-charged ions and prevent them from being washed deep into the soil.
Answer: E
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The cells active in both innate and adaptive immunity develop from common pluripotent precursors in the bone marrow called
A) B cells. B) killer cells. C) stem cells. D) leukocytes.
In the accompanying figure, why does the curve sharply drop after approximately 45°C instead of mirroring the slope
of the line going from 0-40°C?
a. At high temperatures, the reactions proceed so quickly that enzymes are no longer helpful or required. b. This is true of all catalysts and is not due to any special features of enzymes.
c. The kinetic energy of the reactants is so great that it destabilizes the enzyme and diminishes the enzyme's activity. d. The kinetic energy of the reactants is lower than that of the products, forcing a change in enzyme activity. e. The enzyme begins to denature above a certain temperature, eliminating all catalytic activity of the protein.
The organisms associated with patches of floating ocean vegetation would be an example of:
a. random dispersion b. aggregated distribution c. uniform dispersion d. density-dependent distribution e. clumped dispersion
9th week until birth
What will be an ideal response?