An example of a purine is
A) thymine.
B) guanine.
C) deoxyribose.
D) cytosine.
E) ribose 5-phosphate.
Answer: B
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Koch's postulates are criteria used to establish that
A. microbes can be used to clean up toxic spills. B. microbes are found on dust particles. C. life forms can only arise from preexisting life forms. D. a specific microbe should be classified in a specific kingdom. E. a specific microbe is the cause of a specific disease.
The cross GE/ge × ge/ge produces the following progeny: GE/ge 404, ge/ge 396, gE/ge 97, Ge/ge 103. From these data, one can conclude that the recombinant progeny are gE/ge and Ge/ge
Indicate whether the statement is true or false
Refer to Figure 36-2. Absorption of positively charged mineral ions by the root is facilitated by:
a. the movement of clay particles into the root hair.
b. the movement of water into the root hair.
c. the movement of protons into the root hair.
d. the movement of protons out of the root hair.
e. the movement of Mg+ out of the root hair.
Injecting DNA into cells can be accomplished using
A) nitrocellulose membranes. B) silicon chips and nucleic acids. C) compressed air and gold beads. D) micropipettes. E) micropipettes, or compressed air and gold beads.