How does a woody plant widen during secondary growth?
What will be an ideal response?
As a woody plant matures, its inner core of xylem thickens and displaces the vascular cambium toward the outside of the stem or root. Displaced cells of the vascular cambium divide in a widening circle, so this meristem tissue keeps its cylindrical form. Another lateral meristem, cork cambium, forms outside the cylinder of vascular cambium. Cork cambium produces cork, a protective tissue that consists of densely packed dead cells with thick, waxy walls.
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Identify several ways in which the study of hemoglobin variants led to an understanding of the molecular relationship among genes, proteins, and human disease
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After a sperm penetrates the oocyte, the ovum's nuclear membrane disassembles and the two sets of chromosomes approach each other. At this point, the sets of chromosomes are called
A) mononuclei. B) pronuclei. C) gametocytes. D) gametes.
An agent that specifically kills fungi but not other kinds of microorganisms is also known as a ________.
A. germicidal agent B. fungistatic agent C. fungicidal agent D. mycostatic agent
What is the function of the rugae, or folds in the stomach?
A) The rugae push food down toward the intestine. B) The rugae allow the stomach to expand when food enters. C) The rugae manufacture bile. D) The rugae neutralize excess acid.