Describe the location, structure, and importance of the Casparian strip.
What will be an ideal response?
Location: the endodermis, the innermost layer of cortex; Structure: a waxy band within the wall of the endodermal cells; Importance: seals the vascular column from the cortex so materials moving in or out of the vascular column must go through cytoplasm and differentially permeable membranes.
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Transfection is:
A. the artificial introduction of viral DNA into a bacterial cell. B. the artificial introduction of viral DNA into a eukaryotic cell. C. the first step (attachment) of a viral infection using a recombinant virus. D. facilitated by treatment of cells with calcium chloride and heat shock. E. useful when recombinant DNA is not introduced via infection by a viral vector.
Allof the following evidence supports the RNA world hypothesisexcept:
A. RNA can function as a genome. B. An RNA component of ribosomes catalyzes the synthesis of proteins. C. RNA can serve a structural role. D. RNA stabilizes membranes. E. RNA regulates gene expression.
Recent fossil discoveries may represent the earliest animal species ever found. How old are they?
a. 430 million years old b. 25 million years old c. 650 million years old d. 5 billion years old
Homology is evidence of ________
A) binomial classification B) artificial selection C) natural selection D) common ancestry