In RNA viruses, the + RNA genome can act as mRNA right away and proteins can be made. The + genome is used to make - genome, which then makes + genome?  and which is the genome that will be packaged to leave the cell?

How does DNA replication occur in a precise manner to ensure that identical genetic information is put into the new chromatid? See Figures 8.12 and 8.13. FIGURE 8.12 In DNA replication, the two polynucleotide strands uncoil, and each is a template for synthesizing a new strand. A replicated DNA molecule contains one new strand and one old strand. This mechanism is called semiconservative replication. FIGURE 8.13 A close-up look at the process of DNA replication. (a) As the strands uncoil, bases are added to the newly synthesized strand by complementary base pairing with bases in the template strand. The new bases are linked together by DNA polymerase. (b) DNA synthesis can proceed only in the 5 3 direction; newly synthesized DNA on one template strand is made in short segments and linked together by the enzyme DNA ligase.

What is the purpose and benefit of the polymerase chain reaction?

Prokaryotes contain a ______ chromosome, and eukaryotes contain ________ chromosomes. a. single-stranded circular; single-stranded linear b. single-stranded linear: single-stranded circular c. double-stranded circular; double-stranded linear d. double-stranded linear; double-stranded circular