Restriction enzymes are useful in recombinant DNA studies because they
A) cut DNA only at specific locations.
B) can reproduce in bacteria.
C) join the cut ends of small DNA molecules.
D) give plasmids antibiotic properties.
E) can separate pieces of DNA and RNA from each other.
A
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Of the following lipids, which is found in approximately equal amounts in both the outer and inner portions of the lipid bilayer?
A) cholesterol B) glycolipid C) phosphatidylserine D) phophatidylethanolamine E) phophatidylinositol
The initial degradation of cellulose that initiates microbial growth in the Winogradsky column is carried out by ________.
A. Clostridium B. cyanobacteria C. Desulfovibrio D. Rhodopseudomonas
Which type of microscope shows cells against a white background?
A. Confocal B. Electron C. Fluorescence D. Bright-field E. Phase-contrast
Which of the following is NOT an example of variation?
A) cats can have long or short fur B) both monocotyledons and dicotyledons perform the dark reaction C) a child does not have her mother's hair color D) giraffes have not been seen in an albino form E) lobsters can come in many colors including blue, read, and brown