Four of the five blood cell types listed below share a
common origin. Select the exception.
a. neutrophil
b. megakaryocyte
c. lymphocytes
d. monocyte
e. basophil
Answer: b
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Signal transduction is the process by which:
A. transcription factors bind to cis-regulatory regions of DNA and either activate or repress transcription. B. a specific combination of transcription factors determines the developmental pathway in a cell or group of cells. C. a single master gene, or signal, activates a series of downstream genes that lead to cell differentiation. D. an extracellular molecule activates a membrane protein, which in turn activates molecules inside the cell. E. None of these choices is correct.
Which property of water molecules is
responsible for movement of water from roots to leaves in a plant?
a. hydrophobicity b. temperature stability c. fusion d. solvent polarity e. cohesion
Which process employs exposing cells cultured in the laboratory to DNA with a gene of interest?
a. transformation b. Transfection c. DNA fingerprinting d. polymerase chain reaction e. gel electrophoresis
Diatoms have a distinctive two-piece cell wall of silica called a frustule.
Answer the following statement true (T) or false (F)