In a cloning experiment, you use a vector that contains a lacZ gene as a selectable marker. If the competent cells are grown on X-Gal and IPTG, which colonies would contain chromosomal DNA?
A. The white colonies
B. The blue colonies
C. Half the total colonies
D. None of the colonies
A
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What happens to the oxygen that is used in cellular respiration?
A. It is converted to carbon dioxide B. It is used to make glucose C. It is used to make Krebs cycle intermediates D. It is reduced to form water E. It is converted to acetyl-CoA
A patient should be placed in a private room that has monitored negative air pressure if he or she is infected with which organism?
a. H. influenzae b. Mycoplasma pneumonia c. Parvovirus B19 d. Mycobacterium tuberculosis
Relative to a pH of 6, a pH of 4 has a ________
A) 200 times higher H+ concentration B) 100 times higher H+ concentration C) 20 times higher H+ concentration D) 100 times lower H+ concentration
From which studies did the discovery of sex-linked genes and the production of the first chromosome map arise?
a. from the studies of pea plants b. from the studies of humans c. from the studies of fruit flies d. from the studies of corn