What best describes the way a single-stranded complementary tail is formed by a restriction enzyme?
A. Same positional cutting sites lead to vector ends.
B. Uneven cuts lead to orphaned ends of DNA.
C. Staggered cuts in DNA leaves sticky ends.
D. Same base cuts lead to 5' end production.
Answer: C
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Silica-rich shells of ancient diatoms are the source of diatomaceous earth that can be used _____
a. to thicken foods c. as a fertilizer b. as a gelatin substitute d. as an insecticide
Open reading frames (ORFs) are
1.mRNA molecules. 2.random DNA fragments. 3.possible protein coding regions. 4.cloning vectors. 5.a type of bacteriophage.
Which of the following is NOT an essential element
for most land plants? a. sodium, Na b. potassium, K c. copper, Cu d. molybdenum, Mo e. iron, Fe
Which step involves the release of carbon dioxide?
a. The third and fourth steps b. The second step c. The seventh step d. The first and eighth steps