The most plentiful sugar in nature is
a. glucose.
b. fructose.
c. sucrose.
d. lactose.
e. glycogen.
D
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Scientists estimate that about _____ of the world's eukaryotic organisms have been discovered and given scientific names.
A. 1% B. 5% C. 15% D. 40% E. 90%
Even before organs begin to form, rudimentary forms of bone begin to form in a fetus due to _____________.
A) the breakdown of hyaline cartilage. B) the formation of secondary ossification sites. C) the activity of chondroblasts. D) the formation of an osteoclast. E) the activity of growth hormone.
Which of the following bacterial hosts would should be used to avoid degradation of DNA that is introduced via a cloning vector?
A. Escherchia coli RecA mutants B. Saccharomyces cerevisiae wild type cells C. Escherichia coli that lack endonucleases D. RecA-expressing Escherchia coli
A deficiency of vitamin D causes
1.scurvy. 2.rickets. 3.kidney stones. 4.a goiter. 5.dwarfism.