The DNA sequence recognized by restriction endonucleases is generally how long?
a. 1?2 nucleotides
b. 4?8 nucleotides
c. 10?15 nucleotides
d. 24?32 nucleotides
e. 36?47 nucleotides
B
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Eudicot embryos transfer nutrients in endosperm to ________ before germination
a. one cotyledon b. the root apical meristem c. the seed coat d. two cotyledons
Background extinction rates once eliminated 7?8 species per year
Indicate whether the statement is true or false.
Triticale is an allopolyploid hybrid between wheat and rye. Some strains of Triticale show agricultural promise because (Select all that apply.)
A) they combine the high yields of wheat with the ability adapt to unfavorable environments like rye. B) the grain is high in protein, especially the amino acid lysine. C) they combine desirable traits from wheat and rye in one crop plant. D) they are sterile because the wheat and rye chromosomes cannot pair during meiosis.
Avery, Macleod, and McCarty expanded on Griffith's experiment to prove that DNA is the hereditary molecule required for transformation. What treatment of the heat-killed SIII bacteria extract resulted in the mouse living?
A) destroying type SIII lipids and polysaccharides B) destroying type SIII DNA with DNase C) destroying type SIII RNA with RNase D) destroying type SIII proteins with protease E) the control group (null treatment), in which all components are intact