Acidic soils have the following effect on soil nutrients and minerals:
A. they are dissolved completely
B. become unavailable to the plant and adhered to clumps
C. are changed in their chemical composition and become toxic
D. become readily available to plants
D. become readily available to plants
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Classification of viruses into families involves determining all the following characteristics except
A. biochemical reactions. B. type of nucleic acid. C. presence of an envelope. D. type of capsid. E. number of strands in the nucleic acid.
Which of the following is NOT true of plant
hormones?
a. they are active in an adult plant body b. they are signaling molecules c. they produce effects only at high concentrations d. they are produced only in certain regions of the plant e. all of these are NOT true of plant hormones
A _____ bond always involves hydrogen
Fill in the blank(s) with the appropriate word(s).
Which Lophotrochozoan phylum includes members called ribbon worms or proboscis worms, which are found mostly in marine environments?
a. Rotifera b. Nemertea c. Platyhelminthes d. Mollusca