Which layer of cells controls the movement of nutrient minerals entering the xylem in the root's interior?
a. endodermis
b. Casparian strip
c. epidermis
d. cortex
e. periderm
a
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DNA ligase mediates the insertion of foreign DNA into a vector, but it will only be able to do so if the inserts and vector have matching sticky or blunt ends
Indicate whether the statement is true or false.
Which of the following is not true of the process of nonsense-mediated mRNA decay?
A. Its function is to destroy mRNA molecules with premature stop codons. B. The participation of the ribosome is not required. C. It requires the marking of the mRNA before the mRNA is exported to the cytoplasm. D. It involves the removal of the 5' cap of the mRNA.
All of the populations of different species that occupy and are adapted to a given area are known as ____
a. the biosphere b. a community c. an ecosystem d. a niche e. the habitat
Gene therapy
a. has never been used successfully with mammals. b. is a surgical technique that separates chromosomes that have failed to segregate properly during meiosis II. c. has been used successfully to treat victims of Huntington's disorder by removing the dominant damaging autosomal allele and replacing it with a harmless one. d. offers the possibility of replacing defective alleles with normal ones. e. may be used to clone individuals.