Which of the following is not part of the P1 lytic cycle?
A. The DNAs are cut from the linear product of rolling circle replication, circularized, and then packaged into phage heads.
B. When P1 DNA enters the cell, it circularizes its genomes using the Cre-lox recombination system.
C. Rolling circle replication occurs, generating many copies of the phage genome as a long linear DNA.
D. The cells lyse and the mature phages can infect other cells.
E. All of the choices given are part of the lytic cycle.
A
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Which of the following best describes the genetic basis of behavior?
A. Most behaviors are influenced by many genes. B. A few behaviors are strongly influenced by a single gene. C. A few rare behaviors have no genetic basis at all. D. Most behaviors are influenced by many genes, and a few behaviors are strongly influenced by a single gene. E. Most behaviors are influenced by many genes, a few behaviors are strongly influenced by a single gene, and a few rare behaviors have no genetic basis at all.
Explain why HIV becomes resistant so quickly when a single drug is used therapeutically
A. The virus is an RNA genome virus-by using host RNA polymerase to directly copy the genome to make more virus particles, there's no proofreading capability. This leads to a high rate of mutation of the viral genome and increased chance for drug resistance. B. HIV utilizes reverse transcriptase to make a cDNA version of its RNA genome. This polymerase is "'sloppy," with a high rate of error and lack of a proofreading capability. This leads to a high rate of mutation of the viral genome and increased chance for drug resistance. C. HIV synthesizes a protein enzyme that directly cleaves anti-HIV drugs, giving it a characteristically high rate of resistance to a single drug type. D. HIV is constantly changing its genetic structure by swapping genetic elements with other virus strains. This leads to a high rate of mutation of the viral genome and increased chance for drug resistance.
Where do global air circulation patterns begin?
a. At 60o N b. At 30o S c. At the equator d. At 30o N e. At the poles
In basic science, we study phenomena of the natural world
A. with no direct application or product B. to commercialize new products C. to improve the genetics of the human race