Drosophila eggs acquire an initial asymmetry before fertilization as a result of
A. production of bicoid proteins in one end of the egg.
B. maternal DNA molecules being deposited in one end of the egg.
C. nurse cell migration to one end of the egg.
D. maternal mRNA being deposited in one end of the egg.
E. attachments of cadherins to one end of the cell.
D. maternal mRNA being deposited in one end of the egg.
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Which of the following statements is true?
A) A band of ribosomes determines where a cell plate will form in a dividing plant cell. B) The way in which a plant cell differentiates is determined by the position of the nucleus in the developing plant cell. C) Homeotic genes often control morphogenesis. D) Plant cells differentiate because the cytoskeleton determines which genes will be turned "on" and "off." E) The giant sequoia was the first plant to have its genome sequenced.
________ techniques are based on recreating a microenvironment in the laboratory to promote the growth of a microorganism formerly restricted to a small ecological niche.
A. PCR B. Fastidious growth C. Community growth D. Enrichment culture
Determining the susceptibility of a microorganism to specific chemotherapeutic agents is an important service performed in the clinical microbiology laboratory.
Answer the following statement true (T) or false (F)
The image in the accompanying figure is an example of a(n) ____
a. random coil b. double helix c. b sheet d. a helix e. b polysaccharide