In tracheophyte plants, water and dissolved minerals are conducted away from roots by
A. water vessels.
B. stomata.
C. phloem tubes.
D. xylem tubes.
E. chloroplasts.
D. xylem tubes.
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Why is there a new reliance on metagenomics to find new organisms that may produce a medically or industrially important product?
A. So far, only about 10% of useful microbes have been grown in the laboratory. B. We do not have the techniques for growing most microbes found in nature. C. Soils contain so many potential sources of microbes producing antibiotics it would take more than a century to screen them all. D. All of these argue for the need to use metagenomics to identify new useful microbial products.
Functions of the mantle in clams include
a. secreting the shell. b. forming pearls around irritating grains of sand. c. forming the incurrent and excurrent siphons. d. all of the above.
Mendel's "factors" for inheritance are now called ________.
Fill in the blank(s) with the appropriate word(s).
The principal components of cell membranes are:
A) carbohydrates. B) proteins. C) nucleic acids. D) phospholipids. E) sterols.