Species of the genus Thiobacillus ________.
A. are ubiquitous in soil, freshwater, and marine environments
B. produce acids that leach metals out of ore
C. oxidize inorganic sulfur compounds and produce ATP
D. All of the choices are correct.
Answer: D
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Which of the following is NOT a function of
some leukocytes? a. engulf and destroy damaged or dead cells b. engulf anything recognized as foreign c. call up specific immune responses d. carry out specific immune responses e. secrete substances that initiate blood clotting
Which of the following statements is true regarding the use of oligonucleotide primers in PCR?
A. Oligonucleotide primers must hybridize completely to the template DNA strand in order for PCR to proceed; nonhybridized DNA will be degraded. B. The use of oligonucleotide primers is obsolete with the Gibson method of seamless cloning; instead, DNA polymerase and DNA ligase are able to copy the DNA independently. C. Oligonucleotide primers must hybridize to the 5' end of the template strand leaving a 3' primer "overhang"; that sequence will be copied and incorporated into the daughter strands allowing seamless cloning to occur. D. Only a portion of the oligonucleotide primers need to hybridize to the 3' template DNA strand; the 5' "overhang" can contain a restriction site that will be copied during the second and all subsequent cycles of PCR.
Which one of the following explains what xylem loading is?
A. when the xylem is filled with sugars B. right after the xylem is filled with minerals C. when the xylem is filled with water D. xylem loading never occurs E. phloem has given up its water to the xylem
Swollen lymph nodes signal infection and result from increased numbers of ________ that build up in the lymph nodes
Fill in the blank(s) with correct word