In many plant species, older roots and stems thicken by activity at _____
a. apical meristems c. vascular cambium
b. cork cambium d. both cork and vascular cambium
D
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Which of the following is a traditional human use of microorganisms?
A. Cleaning up oil spills B. Treating water and sewage C. Baking bread D. Mass-producing antibiotics
The corpus luteum develops from _____
a. a polar body c. a secondary oocyte b. follicle cells d. spermatogonia
The best explanation for the phenotypic differences between humans and chimps despite the great similarities in their gene-coding sequences is
A. the vast differences in exons between their genomes. B. the "junk" DNA of humans contains important sequences not present in chimps. C. the vast differences in the introns between their genomes. D. differences in gene expression between species.
In general, most antibiotics work by:
A) boosting the human immune system. B) preventing viruses from entering human cells. C) preventing bacteria from entering human cells. D) exploiting differences between human and bacterial cells.