What event divides the early and late period of phage infection?
a. injection of phage DNA into the bacterial cell
b. production of enzymes for DNA synthesis
c. phage DNA replication
d. synthesis of head and tail proteins
e. packaging of phage DNA into heads
Ans: c
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Host defense mechanisms—ways in which the body protects itself from pathogens—can be thought of as an army consisting of how many lines of defense?
A) 2 B) 3 C) 4 D) 5
The secondary immune response is ____ than the primary immune response because the secondary immune response
____.
a. more rapid; does not require B or T cells b. more rapid; involves memory B and T cells that have been stored c. slower; requires initiation of clonal selection of new B and T cells d. slower; requires more antigen than the primary immune response e. more rapid; is less specific than the primary immune response
Trans fats
A) are unsaturated fatty acids. B) resemble saturated fatty acids in shape. C) are associated with an increased risk of heart disease. D) are present in small amounts in meat and dairy products. E) All of these statements are true.
Which of the following statements is false regarding the process of seamless cloning?
A. 3' sticky ends on both the insert and the vector hybridize, and DNA polymerase and DNA ligase complete the circular recombinant molecule. B. Following PCR, the generated insert DNA is mixed with the cleaved vector and an exonuclease is added to degrade the 5' ends of all strands. C. The 5' ends of the oligonucleotide primers contain a recognition site for a restriction enzyme that allows sticky ends to form between the inserted DNA and the vector. D. The 5' ends of the oligonucleotide primers are specific to nucleotides at the desired junction site of the vector.