In which of the following plants does the sporophyte eventually become self-sustaining (i.e., is not dependent on the gametophyte for nutrients)? Select all correct choices
A. mosses
B. gymnosperms
C. hornworts
D. angiosperms
E. ferns
B,D,E
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How can microarrays help us understand cellular functions?
a. Microarrays let us study different cells under different conditions. b. Microarrays let us directly measure protein expression in individual cells. c. Microarrays, by hybridizing cDNAs to DNA sequences already present on a chip, let us identify which portions of a genome were being expressed in a cell at a particular time. d. Microarrays let us identify which DNA sequences are present in a particular cell type under certain conditions. e. Microarrays, by hybridizing DNA to cDNA sequences already present on a chip, let us identify which portions of a genome were being expressed in a cell at a particular time.
Which type of cell functions to help control immune responses in the skin?
a. melanocytes b. Granstein cells c. keratinocytes d. Langerhans cells e. pigmented cells
Regulation of gene expression can NOT be accomplished by controlling:a
the activity of a protein product. b. the amount of mRNA that is available. c. the rate of translation of mRNA. d. the rate of mRNA degradation. e. the rate of DNA replication
Which of the following statements is true?
A) The process of respiration is critical for maintaining the freshwater pools on Earth's surface. B) Transpiration moves saltwater to the atmosphere and then to freshwater pools on Earth's surface. C) About 2.5 percent of Earth's water is fresh at any given time. D) Glaciers make up about 20 percent of Earth's freshwater pool. E) An aquifer is a pool of freshwater perched over the base groundwater that is accessible by humans.