Describe the ways in which cell membranes are semipermeable.
What will be an ideal response?
Descriptions should include: hydrophilic substances requiring a transporter protein (unless they are less than 600 daltons in size); hydrophobic substances may pass through the membrane; ions require ion channels.
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I need to determine if the gene for a particular protein is the same length in frogs, humans, and trees. Which method(s)
will be most helpful to me?
a. PCR and agarose gel electrophoresis b. DNA cloning and PCR c. DNA cloning only d. PCR only e. agarose gel electrophoresis only
Which of the following observations did not influence Darwin's later thoughts about evolution?
a. The discovery of fossils that resembled extant organisms in the same region. b. The observation that animals from similar habitats in South America and Europe were very different. c. A great variety of species exist across the globe. d. Species on islands differed from species on the mainland closest to the island. e. North American and South American species were more similar to each other than European and African species.
What is the major reservoir of phosphorus?
a. atmosphere b. sedimentary rock c. ocean d. land food webs e. groundwater
Double fertilization occurs in
A. gymnosperms. B. mosses. C. lichens. D. angiosperms.