A transposon may carry genes for proteins that enable their transposition as well as genes for other functions such as drug resistance
Indicate whether the statement is true or false
TRUE
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An organism that appears red with a black center on XLD agar is lactose-_____ and H2S-_____
a. positive; positive b. positive; negative c. negative; positive d. negative; negative
In the polymerase chain reaction (PCR) the DNA is first heated to break the hydrogen bonds between the two polynucleotide strands, producing two single-stranded molecules that will serve as templates. Which of the following choices would be the second step in PCR?
1.The mixture is cooled and primers bind to complementary DNA regions. 2.Taq polymerase synthesizes a complementary DNA strand for each single-stranded molecule. 3.The mixture is heated and primers bind to complementary DNA regions. 4.The DNA is cut into fragments with a restriction enzyme. 5.The DNA is stained.
Mitosis and cytoplasmic division of a cell in an ovule
produces four __________, one of which gives rise to the female gametophyte. Fill in the blank(s) with the appropriate word(s).
Which bacteria ferment lactose in milk, producing acids that curdle the milk?
A. Streptococcus lactis and Lactobacillus B. Saccharomyces cerevisiae C. Pediococcus D. Leuconostoc mesenteroides E. Spirulina